#include<stdio.h>
#include<conio.h>
void main()
{
   int a=10;
   int b=20;
   printf("%d \n",a<b); //true=1,false=0 a<=b,a>=bitand
   printf("%d \n",a==b); //t=1,f=0
   printf("%d \n",a!=b);
    getch();
}

#include<stdio.h>
#include<conio.h>
void main()
{
    int i=10;
    int x=i++;
    printf("%d \n",x);//10
    printf("%d \n",i);//11
    
    int j=5;
    int y=--j;//4
    printf("%d \n",y);
    getch();
}

#include<stdio.h>
#include<conio.h>
void main()
{
    int a=10;
    printf("%d \n",a);//10
    ++a;
    printf("%d \n",a);//11
    
    printf("%d \n",a++); //11
    
    printf("%d",a); //12
    
    getch();
}

#include<stdio.h>
#include<conio.h>
void main()
{
    int a,b,c,d;
    a=11;
    b=2;
    c=a%b;
    d=a/b;
    printf("reminder: %d \n",c);
    printf("quotient: %d",d);
}

#include<stdio.h>
#include<conio.h>

void main()
{
    int marks[10];
    
    marks[0]=50;
    marks[1]=20;
    
    for(int i=2;i<10;i++)
    {
        scanf("%d",&marks[i]);
    }
    
    for(int i=0;i<10;i++)
    {
        printf("marks: %d \n %d \n",i,marks[i]);    
    }
}

#include<stdio.h>
#include<conio.h>
void main()
{
    int a; //declaration
    a=5; //assign
    
    int b;
    b=2;
    
    int c,d,e;
    float f;
    c=a+b;
    d=a-b;
    e=a*b;
     f=(float)a/b;
    printf("%d %d %d %f",c,d,e,f);
    
}

#include<stdio.h>
#include<conio.h>
void main()
{
    char grade='A';
    printf("grade: %c \n",grade);
    
    double accuracy=10.12312344;
    printf("ACCURACY: %lf",accuracy); //lf= long float
    
}    
    

#include<stdio.h>
#include<conio.h>
void main()
{
    int a=5;
    printf("%d \n",a); //%d etc are  format specifiers \n new line command
    
    float b=9.2;
    printf("%f",b);
    
    getch();
}

#include<stdio.h>
#include<conio.h>
void main()
{
    int a; //declaration
    a=10; //assign
    
    int b;
    b=20;
    
    int c,d,e,f;
    c=a+b;
    d=a-b;
    e=a*b;
    f=a/b;
    printf("%d %d %d %d",c,d,e,f);
    
}

// Queue implementation in C

#include <stdio.h>
#include <stdlib.h>
#define SIZE 5

void enqueue();
void dequeue();
void display();

int items[SIZE], front = -1, rear = -1;

int main() {
  //deQueue is not possible on empty queue
  int x;
  
  printf("1 for enqueue\n");
  printf("2 for dequeue\n");
  printf("3 for display\n");
  printf("0 for exit\n");
  while(1)
  {
      printf("enter choise:");
      scanf("%d",&x);
      
      switch(x)
      {
        case 1:
            enqueue();
            break;
        case 2:
            dequeue();
            break;
        case 3:
            display();
            break;
        case 0:
            exit(1);
            printf("EXIT");
        default:
            printf("plz enter valid number\n");
      }
  }

  return 0;
}

void enqueue(){
    int value;
    
    printf("enter value to enqueue:");
    scanf("%d",&value);
    
  if (rear == SIZE - 1)
    printf("\nQueue is Full!!");
  else {
    if (front == -1)
      front = 0;
    rear++;
    items[rear] = value;
    printf("\nInserted -> %d\n", value);
  }
}

void dequeue(){
  if (front == -1)
    printf("\nQueue is Empty!!");
  else {
    printf("\nDeleted : %d\n", items[front]);
    front++;
    if (front > rear)
      front = rear = -1;
  }
}

// Function to print the queue
void display(){
  if (rear == -1)
    printf("\nQueue is Empty!!!");
  else {
    int i;
    printf("\nQueue elements are:\n");
    for (i = front; i <= rear; i++)
      printf("%d  ", items[i]);
  }
  printf("\n");
}

#include<stdio.h>
#include <stdlib.h>
int s[100],top=0,n;

void push()
{
    int x;
    
    if(top>=n)
    {
        printf("stack overflow\n");
    }
    else
    {
        printf("enter number:");
        scanf("%d",&x);
        top++;
        s[top]=x;
    }
}
void pop()
{
    if(top<=0)
    {
        printf("stack underflow\n");
    }
    else
    {
        printf("%d is popped\n",s[top]);
        top--;
    }
}
void peep()
{
    int i;
    
    printf("enter ith position:");
    scanf("%d",&i);
    
    if(top-i+1<=0)
    {
        printf("stack underflow\n");
    }
    else
    {
        printf("%d is %dth valur from the top\n",s[top-i+1],i);
    }
}
void change()
{
    int i,x;
    
    printf("enter ith position from top to change:");
    scanf("%d",&i);
    
    if(top-i+1<=0)
    {
        printf("stack underflow\n");
    }
    else
    {
        printf("enter new value:");
        scanf("%d",&x);
        
        s[top-i+1]=x;
        printf("new value of %dth position from top is %d\n",i,x);
    }
    
}
int main()
{
    int choise;
    
    printf("enter length of stack:");
    scanf("%d",&n);
    
    printf(" 1 for push \n");
    printf(" 2 for pop \n");
    printf(" 3 for peep \n");
    printf(" 4 for change \n");
    printf(" 0 for exit \n");
    
    
    while(1)
    {
        printf("enter choise:");
        scanf("%d",&choise);
        
        switch(choise)
        {
            case 1:
                push();
                break;
            case 2:
                pop();
                break;
            case 3:
                peep();
                break;
            case 4:
                change();
                break;
            case 0:
                exit(1);
                break;
            default:
                printf("enter valid number\n");
                
        }
    }
}

#include <stdio.h>

int main() {
    int myInt;
    myInt = 0xFFFFFFE2;
    printf("%d\n",myInt);

    return 0;
}

#include <cs50.h>
#include <stdio.h>

int main(void)
         {
         int x = get_int("x: ");
		 int y = get_int("y: ");
		 int z = x + y;
		 printf("%i\n", z);
         }

#include <stdio.h>

main(){
    int myAge[5];
    myAge[0] = 2;
    myAge[1] = 3;
    myAge[2] = 4;
    myAge[3] = 5;
    myAge[4] = 6;
    printf("my age is %i", myAge[0]);
    return 0;
}

#include <stdio.h>

main(){
    int age[5] = {2, 3, 4, 5, 6};
    printf("%d \n", age[0]);
    printf("%d \n", age[2]);
    printf("%d \n", age[3]);
    printf("%d \n", age[4]);
    return 0;
}

#include <cs50.h>
#include <studio.h>

int main(void)
         {
         string answer = get_string("What's your name? ");
		 printf("hello, %s\n", answer);
         }

#include <stdio.h>  
int binarySearch(int a[], int beg, int end, int val)    
{    
    int mid;    
    if(end >= beg)     
    {        mid = (beg + end)/2;    
/* if the item to be searched is present at middle */  
        if(a[mid] == val)    
        {                 
            return mid+1;    
        }    
            /* if the item to be searched is smaller than middle, then it can only be in left subarray */  
        else if(a[mid] < val)     
        {  
            return binarySearch(a, mid+1, end, val);    
        }    
            /* if the item to be searched is greater than middle, then it can only be in right subarray */  
        else     
        {  
            return binarySearch(a, beg, mid-1, val);    
        }          
    }    
    return -1;     
}   
int main() {  
  int a[] = {11, 14, 25, 30, 40, 41, 52, 57, 70}; // given array  
  int val = 40; // value to be searched  
  int n = sizeof(a) / sizeof(a[0]); // size of array  
  int res = binarySearch(a, 0, n-1, val); // Store result  
  printf("The elements of the array are - ");  
  for (int i = 0; i < n; i++)  
  printf("%d ", a[i]);   
  printf("\nElement to be searched is - %d", val);  
  if (res == -1)  
  printf("\nElement is not present in the array");  
  else  
  printf("\nElement is present at %d position of array", res);  
  return 0;  
}  

#include <stdlib.h>
#include <stdio.h>
#include <windows.h>
#include <psapi.h>
#define SIZE_TAB 200

volatile char program[SIZE_TAB];
CRITICAL_SECTION CriticalSection;
DWORD WINAPI aa(void *v);
DWORD WINAPI bb(void *v);

int main(int argc, char *argv[])
{
InitializeCriticalSection(&CriticalSection);

HANDLE thread_a = CreateThread(NULL, 0, aa, 0, 0, 0);
HANDLE thread_b = CreateThread(NULL, 0, bb, 0, 0, 0);

while (1)
{
    for (int i = 0; i<SIZE_TAB; i++)
        printf("%c", program[i]);
    Sleep(1000);
    printf("\n\n");
}

DeleteCriticalSection(&CriticalSection);

CloseHandle(thread_a);
CloseHandle(thread_b);
return 0;
}


 DWORD WINAPI aa(void *v)
 {

    EnterCriticalSection(&CriticalSection);
    for (int i = 0; i < SIZE_TAB; i++)
    {
        program[i] = 'A';
        for (int j = 0; j<8000; j++);
    }
    LeaveCriticalSection(&CriticalSection);

   }

   DWORD WINAPI bb(void *v)
   {

    EnterCriticalSection(&CriticalSection);
    for (int i = 0; i<SIZE_TAB; i++)
    {
        program[i] = 'B';
        for (int j = 0; j<8000; j++);
    }
    LeaveCriticalSection(&CriticalSection);
   } 

static void send_binary(esp_mqtt_client_handle_t client)
{
    spi_flash_mmap_handle_t out_handle;
    const void *binary_address;
    const esp_partition_t *partition = esp_ota_get_running_partition();
    esp_partition_mmap(partition, 0, partition->size, SPI_FLASH_MMAP_DATA, &binary_address, &out_handle);
    // sending only the configured portion of the partition (if it's less than the partition size)
    int binary_size = MIN(CONFIG_BROKER_BIN_SIZE_TO_SEND,partition->size);
    int msg_id = esp_mqtt_client_publish(client, "/topic/binary", binary_address, binary_size, 0, 0);
    ESP_LOGI(TAG, "binary sent with msg_id=%d", msg_id);
}

#include <stdio.h>
#include <stdlib.h>

int main()
{
    printf("Hello world!\n");
    return 0;
}

#include <stdio.h>
#include <stdlib.h>

int main()
{
int favNum = 90;
printf("My fav %s is %d", "number", 500);

    return 0;
}

#include <stdio.h>

#include <stdlib.h>


int main()

{

 int luckyNumber[] = {2, 2, 3, 33, 1};

 luckyNumber[1] = 200;

 printf("%d", luckyNumber[1]);

 return 0;

}

#include <stdio.h>

#include <stdlib.h>


int main()

{

 int luckyNumber[] = {2, 2, 3, 33, 1};

 printf("%d", luckyNumber[3]);

 return 0;

}

#include <stdio.h>

#include <stdlib.h>


int main()

{

 printf("Top");

 sayHi();

 printf("bottom");

 return 0;

}


VoidsayHi90(){

 printf("Hello world");

}

#include <stdio.h>

#include <stdlib.h>



int main()

{

 int num1;

 int num2;

 printf("Enter first number ");

 scanf("%d", &num1);

 printf("Enter second number ");

 scanf("%d", &num2);


 printf("Answer: %d, num1 + num2 ");


return 0;

}

#include <stdio.h>

#include <stdlib.h>


int main()

{

 char color[20];

 char pluralNoun [20];

 char personF[20];

 char personL[20];


 printf("Enter a color: ");

 scanf("%s", color);

 printf("Enter a pliuralNoun ");

 scanf("%s", pluralNoun);

 printf("Enter a person: ");

 scanf("%s%s", personF, personL);



 printf("The great American race is %s\n", color);

 printf("%s are Merican\n", pluralNoun);

 printf("I ate %s %s\n", personF, personL);


return 0;

}

#include <stdio.h>

main()
{
  printf("Hello Worlds\n");
  
  return 0;
}

char buffer[BUFFER_SIZE];
while (fscanf(stream, "%s", buffer) == 1) // expect 1 successful conversion
{
  // process buffer
}
if (feof(stream)) 
{
  // hit end of file
}
else
{
  // some other error interrupted the read
}

#include <stdio.h>
#include <stdlib.h>

int main(){

    FILE *myFile;
    myFile = fopen("somenumbers.txt", "r");

    //read file into array
    int numberArray[16];
    int i;

    if (myFile == NULL){
        printf("Error Reading File\n");
        exit (0);
    }

    for (i = 0; i < 16; i++){
        fscanf(myFile, "%d,", &numberArray[i] );
    }

    for (i = 0; i < 16; i++){
        printf("Number is: %d\n\n", numberArray[i]);
    }

    fclose(myFile);

    return 0;
}

printf("Enter numbers from 1-1000 (To indicate you are done, enter 0)\n");
	
	// Getting input from user
	float input;
	for (int i = 0; i < numsLen; ++i) {
		printf("Enter a number: ");
		scanf("%f", &input);
		if (input == 0) break;
		nums[i] = input;
		++newLen;
	}

/*
  Rui Santos
  Complete project details at https://RandomNerdTutorials.com/esp8266-nodemcu-webserial-library/
  
  This sketch is based on the WebSerial library example: ESP8266_Demo
  https://github.com/ayushsharma82/WebSerial
*/

#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <ESPAsyncTCP.h>
#include <ESPAsyncWebServer.h>
#include <WebSerial.h>

#define LED 2

AsyncWebServer server(80);

const char* ssid = "REPLACE_WITH_YOUR_SSID";          // Your WiFi SSID
const char* password = "REPLACE_WITH_YOUR_PASSWORD";  // Your WiFi Password

void recvMsg(uint8_t *data, size_t len){
  WebSerial.println("Received Data...");
  String d = "";
  for(int i=0; i < len; i++){
    d += char(data[i]);
  }
  WebSerial.println(d);
  if (d == "ON"){
    digitalWrite(LED, LOW);
  }
  if (d=="OFF"){
    digitalWrite(LED, HIGH);
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(LED, OUTPUT);
  digitalWrite(LED, HIGH);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  if (WiFi.waitForConnectResult() != WL_CONNECTED) {
    Serial.printf("WiFi Failed!\n");
    return;
  }
  Serial.println("IP Address: ");
  Serial.println(WiFi.localIP());
  // WebSerial is accessible at "<IP Address>/webserial" in browser
  WebSerial.begin(&server);
  WebSerial.msgCallback(recvMsg);
  server.begin();
}

void loop() {
  WebSerial.println("Hello!");
  delay(2000);
}

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main () {
   int i, n;
   time_t t;
   
   n = 5;
   
   /* Intializes random number generator */
   srand((unsigned) time(&t));

   /* Print 5 random numbers from 0 to 49 */
   for( i = 0 ; i < n ; i++ ) {
      printf("%d\n", rand() % 50);
   }
   
   return(0);
}

float rstoc(x) {
  float decimal = abs(x - trunc(x));

  float random_selector = (float)rand() / RAND_MAX;

  float adjustor;
  if (random_selector < decimal) adjustor = 1;
  else adjustor = 0;

  // consider sign
  if(x < 0) adjustor = -1 * adjustor;

  return trunc(x) + adjustor;
}

int solution(int n) {
    int right = n & -n;    // 가장 오른쪽 1인 비트의 값
    int x     = n + right; // 원래 수 + 가장 오른쪽 비트
    
    return x | (((x ^ n) >> 2) / right); // 줄어든 1의 개수만큼 오른쪽부터 채운다
}

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>

struct node {
   int data;
   int key;
   struct node *next;
};

struct node *head = NULL;
struct node *current = NULL;

//display the list
void printList() {
   struct node *ptr = head;
   printf("\n[ ");
	
   //start from the beginning
   while(ptr != NULL) {
      printf("(%d,%d) ",ptr->key,ptr->data);
      ptr = ptr->next;
   }
	
   printf(" ]");
}

//insert link at the first location
void insertFirst(int key, int data) {
   //create a link
   struct node *link = (struct node*) malloc(sizeof(struct node));
	
   link->key = key;
   link->data = data;
	
   //point it to old first node
   link->next = head;
	
   //point first to new first node
   head = link;
}

//delete first item
struct node* deleteFirst() {

   //save reference to first link
   struct node *tempLink = head;
	
   //mark next to first link as first 
   head = head->next;
	
   //return the deleted link
   return tempLink;
}

//is list empty
bool isEmpty() {
   return head == NULL;
}

int length() {
   int length = 0;
   struct node *current;
	
   for(current = head; current != NULL; current = current->next) {
      length++;
   }
	
   return length;
}

//find a link with given key
struct node* find(int key) {

   //start from the first link
   struct node* current = head;

   //if list is empty
   if(head == NULL) {
      return NULL;
   }

   //navigate through list
   while(current->key != key) {
	
      //if it is last node
      if(current->next == NULL) {
         return NULL;
      } else {
         //go to next link
         current = current->next;
      }
   }      
	
   //if data found, return the current Link
   return current;
}

//delete a link with given key
struct node* delete(int key) {

   //start from the first link
   struct node* current = head;
   struct node* previous = NULL;
	
   //if list is empty
   if(head == NULL) {
      return NULL;
   }

   //navigate through list
   while(current->key != key) {

      //if it is last node
      if(current->next == NULL) {
         return NULL;
      } else {
         //store reference to current link
         previous = current;
         //move to next link
         current = current->next;
      }
   }

   //found a match, update the link
   if(current == head) {
      //change first to point to next link
      head = head->next;
   } else {
      //bypass the current link
      previous->next = current->next;
   }    
	
   return current;
}

void sort() {

   int i, j, k, tempKey, tempData;
   struct node *current;
   struct node *next;
	
   int size = length();
   k = size ;
	
   for ( i = 0 ; i < size - 1 ; i++, k-- ) {
      current = head;
      next = head->next;
		
      for ( j = 1 ; j < k ; j++ ) {   

         if ( current->data > next->data ) {
            tempData = current->data;
            current->data = next->data;
            next->data = tempData;

            tempKey = current->key;
            current->key = next->key;
            next->key = tempKey;
         }
			
         current = current->next;
         next = next->next;
      }
   }   
}

void reverse(struct node** head_ref) {
   struct node* prev   = NULL;
   struct node* current = *head_ref;
   struct node* next;
	
   while (current != NULL) {
      next  = current->next;
      current->next = prev;   
      prev = current;
      current = next;
   }
	
   *head_ref = prev;
}

void main() {
   insertFirst(1,10);
   insertFirst(2,20);
   insertFirst(3,30);
   insertFirst(4,1);
   insertFirst(5,40);
   insertFirst(6,56); 

   printf("Original List: "); 
	
   //print list
   printList();

   while(!isEmpty()) {            
      struct node *temp = deleteFirst();
      printf("\nDeleted value:");
      printf("(%d,%d) ",temp->key,temp->data);
   }  
	
   printf("\nList after deleting all items: ");
   printList();
   insertFirst(1,10);
   insertFirst(2,20);
   insertFirst(3,30);
   insertFirst(4,1);
   insertFirst(5,40);
   insertFirst(6,56);
   
   printf("\nRestored List: ");
   printList();
   printf("\n");  

   struct node *foundLink = find(4);
	
   if(foundLink != NULL) {
      printf("Element found: ");
      printf("(%d,%d) ",foundLink->key,foundLink->data);
      printf("\n");  
   } else {
      printf("Element not found.");
   }

   delete(4);
   printf("List after deleting an item: ");
   printList();
   printf("\n");
   foundLink = find(4);
	
   if(foundLink != NULL) {
      printf("Element found: ");
      printf("(%d,%d) ",foundLink->key,foundLink->data);
      printf("\n");
   } else {
      printf("Element not found.");
   }
	
   printf("\n");
   sort();
	
   printf("List after sorting the data: ");
   printList();
	
   reverse(&head);
   printf("\nList after reversing the data: ");
   printList();
}

#include <stdio.h>

int main() {
    int marks[4];
    int *ptr;
    ptr = &marks[0];
    int i;
    
    for(i=0;i<4;i++){
        printf("enter the value of the marks: %d\n" , i+1);
        scanf("%d" , ptr);
        ptr++;
        
    }
     for(i=0;i<4;i++){
         printf(" the value of the marks %d is :%d\n" , i+1 , marks[i]);
     }
    
	//code
	return 0;
}

#include <stdio.h>
int factorial(int a);


int main() {
    int a =3;
    
    printf("the value of factorial is %d" , factorial(a));
	//code
	return 0;
}

int factorial(int a){
 
 
 if(a==0 || a==1){
     return 1;
 }else{
     return a * factorial(a-1);
 }
}

#include <stdio.h>
void printpattern(int n);

int main() {
    int n = 4;
    
    printpattern(n);
    
    
	//code
	return 0;
}
void printpattern(int n){
    int i;
    if(n == 1){
        printf("*\n");
        return;
    }
    printpattern(n-1);
    for(i=0;i<2*n-1;i++){
        printf("*");
        
    }
    printf("\n");
}

#include <stdio.h>
int fib(int a);

int main() {
    int a;
    printf("enter the number\n");
    scanf("%d" , &a);
    
    
    printf("the sequence will be %d" , fib(a));
	//code
	return 0;
}

int fib(int a){
    int f;
    if (a == 1 || a == 2){
        return 1;
        
    }else{
        f = fib(a-2) + fib(a-1);
        return f;
    }
}

#include <stdio.h>
#include<stdlib.h>
#include<time.h>


int main() {
    
    int number , nguess=1 , guess;
    srand(time(0));
    number = rand()%100+1;
    
   // printf("the number is %d" , number);
    
    do{
        printf("guess the number between 1-100 %d\n" , guess);
        scanf("%d" , &guess);
        
        if(guess<number){
            
            printf("enter higher number\n");
            
        }
        else if(guess>number){
            
            printf("enter lower number\n");
        }
    else {
        
        printf("you guessed the number in %d attempts\n" , nguess);
    }
    
    nguess++;
    } while(guess!=number);
    
	//code
	return 0;
}

#include <stdio.h>

int main() {
    
    int i=1;
    int n;
    
    printf("enter the number\n");
    scanf("%d" , &n);
    
    do{
        printf("%d\n" , i*n);
        
        i++;
    }while(i <= 10);
	//code
	return 0;
}

#include <stdio.h>

int main() {
    
    int i = 0;
    
    for (i=0; i<50 ; i++) {
        
    if(i %2==0){
        
        printf("the n even numbers are %d\n" , i);
    }
        /* code */
    }
	//code
	return 0;
}

#include <stdio.h>

int main() {
    
     int year;
     printf("enter the year\n");
     scanf("%d" , &year);
     
     
     (year %4 ==0) ? (printf("the year is leap year")) : (printf("the year is not leap year"));
	//code
	return 0;
}

#include <stdio.h>

int main() {
    
    int i = 0;
    
    while(i<50){
        
        if(i %2==0){
            
            printf("the number is even %d\n" , i);
        }
        
        i++;
    }
	//code
	return 0;
}

#include <stdio.h>

int main() {
    
    float a , b , c , d;
    
    printf("enter the numbers\n");
    scanf(" %f %f %f %f" , &a , &b , &c , &d);
    
   
    if(a > b && a > c && a > d){
        
        printf("a is the greatesr number %f" , a);
    }
    
     if(b > a && b > c && b > d){
        
        printf("b is the greatesr number %f" , b);
    }
    
     if(c > b && c > a && c > d){
        
        printf("c is the greatesr number %f" , c);
    } 
    
    
    if(d > b && d > c && d > a){
        
        printf("d is the greatesr number %f" , d);
    }
	//code
	return 0;
}

#include <stdio.h>

int main() {
    int i = 0;
    int n;
    
    printf("enter the value of n\n");
    scanf("%d" , &n);
    
    
    do{
        
     printf("the first n numbers are %d\n" , i+1);
     
     i++;
    }
    while(i < n);
	//code
	return 0;
}

include <msp430.h>

int main(void)
{
    WDTCTL = WDTPW | WDTHOLD;                          // Stop watchdog timer

    // Configure two FRAM waitstate as required by the device datasheet for MCLK
    // operation at 24MHz(beyond 8MHz) _before_ configuring the clock system.
   // FRCTL0 = FRCTLPW | NWAITS_2;

    __bis_SR_register(SCG0);                           // disable FLL
    CSCTL3 |= SELREF__REFOCLK;                         // Set REFO as FLL reference source
    CSCTL0 = 0;                                        // clear DCO and MOD registers
    CSCTL1 |= DCORSEL_7;                               // Set DCO = 24MHz
    CSCTL2 = FLLD_0 + 732;                             // DCOCLKDIV = 24MHz
    __delay_cycles(3);
    __bic_SR_register(SCG0);                           // enable FLL
    while(CSCTL7 & (FLLUNLOCK0 | FLLUNLOCK1));         // FLL locked

    CSCTL4 = SELMS__DCOCLKDIV | SELA__REFOCLK;        // set default REFO(~32768Hz) as ACLK source, ACLK = 32768Hz
                                                       // default DCOCLKDIV as MCLK and SMCLK source
    CSCTL5 = DIVS_2;                                   // se divide totul la 2

    P1DIR |= BIT0 | BIT1 | BIT2;                       // set ACLK SMCLK and LED pin as output
    P1SEL1 |= BIT0 | BIT1;                             // set ACLK and  SMCLK pin as second function


    PM5CTL0 &= ~LOCKLPM5;                              // Disable the GPIO power-on default high-impedance mode
                                                       // to activate previously configured port settings

    while(1)
    {
        P1OUT ^= BIT2;                                 // Toggle P1.2 using exclusive-OR
        __delay_cycles(12000000);                       // Delay for 12000000*(1/MCLK)=0.5s
    }
}

#include <String.h>
#include <stdio.h>
int main() {
  // initializing the pointer string array
  char *names[] = {"tree", "bowl", "hat", "mice", "toon"};
  char *temp; // temporary variable for swaping the values
  int i, j, a;
  printf("The names are:\n");
  for (i = 0; i < 5; i++)
    printf("%s\n", names[i]);
  // arranging names in alphabetically using selection sort
  for (i = 0; i < 5; i++) {
    for (j = i + 1; j < 5; j++) {
      // compares the two string and returns an integer value
      // if the value of a is greater than 0 then swapping begins
      a = strcmp(names[i], names[j]);
      
      if (a > 0) {
        temp = names[i];
        names[i] = names[j];
        names[j] = temp;
      }
    }
  }
  printf("The arranged names are:\n");
  for (i = 0; i < 5; i++)
    printf("%s\n", names[i]);
  return 0;
}

#include "Arduino.h"
#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"
#include <Adafruit_NeoPixel.h>
#include <Servo.h>

// sensors
#define LDR0pin A0 
#define LDR1pin A1 
#define LDR2pin A2 
#define LDR3pin A3 
#define LDR4pin A4 

// servos/motors
#define boo1pin 2
#define boo2pin 3
#define ceilingpin 4

// gun
#define buttpin 5
#define indipin 6
#define laserpin 7

// LEDs
#define melodypin 8
#define mompin 9
#define DATA_PIN 10 
#define NUM_LEDS 20 

// DFPlayer
SoftwareSerial mySoftwareSerial(12, 13); // TX, RX
DFRobotDFPlayerMini myDFPlayer;

// led strips
Adafruit_NeoPixel lightning_strip = Adafruit_NeoPixel(NUM_LEDS, DATA_PIN, NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel melody = Adafruit_NeoPixel(2, melodypin, NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel mom = Adafruit_NeoPixel(2, mompin, NEO_GRB + NEO_KHZ800);

// servos
// twelve servo objects can be created on most boards
Servo servo0;  // create servo1 object to control a servo1
Servo servo1;
Servo servo2;

// ADJUST FOR LIGHT THRESHOLDS
short laserThresh = 240;
short altThresh = 255;

// lightning
unsigned long flickerTime = 0, fadeInTime = 0;
byte i = 6, lowBright = 10, highBright = 255;
boolean lightState = true;

// boo servos
unsigned long booTime = 0;
boolean booState = false;

// mom, melody, ceiling trigger times
unsigned long momTime = 0, melodyTime = 0, ceilingTime = 0;

 // used for debouncing button
unsigned long lastDebounceTime = 0, highTime = 1, lasthighTime = 0;
byte buttonState, lastButtonState = HIGH;
boolean adjust = true;

// sensors
byte LDR0 = 0, LDR1 = 0, LDR2 = 0, LDR3 = 0, LDR4 = 0, LDR5 = 0;

void setup() {
  lightning_strip.begin();
  lightning_strip.setBrightness(lowBright);
  setLightning(0,255,0);

  melody.begin();
  melody.setBrightness(100);
  setMelody(0,0,0);

  mom.begin();
  mom.setBrightness(100);
  setMom(0,0,0);
  
  mySoftwareSerial.begin(9600);
  Serial.begin(9600);
  
  Serial.println();
  Serial.println(F("DFRobot DFPlayer Mini Demo"));
  Serial.println(F("Initializing DFPlayer ... (May take 3~5 seconds)"));
  
  if (!myDFPlayer.begin(mySoftwareSerial)) {  //Use softwareSerial to communicate with mp3.
    Serial.println(F("Unable to begin:"));
    Serial.println(F("1.Please recheck the connection!"));
    Serial.println(F("2.Please insert the SD card!"));
    while(true);
  }
  Serial.println(F("DFPlayer Mini online."));

  // CHANGE TO 20
  myDFPlayer.volume(30);  //Set volume value (0~30).

  // gun
  pinMode(laserpin, OUTPUT);
  pinMode(indipin, OUTPUT);
  pinMode(buttpin, INPUT_PULLUP);

  // sensors
  pinMode(LDR0pin, INPUT);
  pinMode(LDR1pin, INPUT);
  pinMode(LDR2pin, INPUT);
  pinMode(LDR3pin, INPUT);
  pinMode(LDR4pin, INPUT);

  // servos
  
  servo0.attach(boo1pin);
  servo1.attach(boo2pin);  // attaches the servo1 on pin 9 to the servo1 object
  servo2.attach(ceilingpin);

  // initialize servo positions:
  servo0.write(40); // boo1 swivels out RIGHT
  servo1.write(40); // boo2 swivels out LEFT
  servo2.write(90); // ceiling starts horizontal

  // opening song
  myDFPlayer.playMp3Folder(0);
}

void loop() {
  LDR0 = analogRead(LDR0pin);
  LDR1 = analogRead(LDR1pin);
  LDR2 = analogRead(LDR2pin);
  LDR3 = analogRead(LDR3pin);
  LDR4 = analogRead(LDR4pin);

  //trigger(trig_time, reload_time);
  //default (250, 1000)
  trigger(250, 1000);

  // boo(toggle_interval
  boo(2000);

  //lightning(flickerRate, blackout_time);
  lightning(150, 3000);
  lightning_strip.show();
  Serial.println(LDR4);

  //targetHit(playTime)
  melodyHit(4000);
  momHit(5500);
  ceiling(3000);
}

void ceiling (short playTime) {
  if (LDR4 > laserThresh) {
     ceilingTime = millis();
     myDFPlayer.playMp3Folder(4);
  }
  
  if (millis() - ceilingTime < playTime) servo2.write(0);
  else servo2.write(90);
}

void melodyHit (short playTime) {
  // if target hit, reset routine
  if (LDR2 > laserThresh) {
    melodyTime = millis();
    myDFPlayer.playMp3Folder(2);
  }

  if ((millis() - melodyTime < playTime)&&(melodyTime > 0)) setMelody(128, 0, 128);
  else setMelody(0, 0, 0);
}

void momHit (short playTime) {
  // if target hit, reset routine
  if (LDR3 > laserThresh) {
    momTime = millis();
    myDFPlayer.playMp3Folder(3);
  }

  if ((millis() - momTime < playTime)&&(momTime > 0)) setMom(128, 0, 128);
  else setMom(0, 0, 0);
}

void boo (short toggle_interval) {
  if (millis() - booTime > toggle_interval) {
    booState = !booState;
    booTime = millis();
  }
  
  if (booState)  {
    servo0.write(40);
    servo1.write(40);
  }
  
  else  {
    servo0.write(160);
    servo1.write(160);
  }
}

void lightning (short flickerRate, short blackout) {
  if (i > 6) i = 6;
  
  // if target hit, reset routine
  if ((LDR0 > laserThresh)||(LDR1 > laserThresh)) {
    i = 0;
    lightning_strip.setBrightness(highBright);
    lightState = true;
    myDFPlayer.playMp3Folder(1);
  }

  // flicker on/off 5 times at flickerRate
  if ((millis() - flickerTime > flickerRate)&& (i < 5)) 
  {
    lightState = !lightState;
    if (lightState) setLightning(255,255,255);
    else setLightning(0,0,0);
    i++;
    flickerTime = millis();
  }

  // lights stay off for blackout time
  else if ((millis() - flickerTime > blackout)&& (i == 5)) 
  {
    lightning_strip.setBrightness(lowBright);
    for (short j = 0 ; j < 255 ; ) {
      if (fadeInTime - millis() > 25) {
        setLightning(0, j, 0);
        j++;
      }
      fadeInTime = millis();
    }
    
    lightState = !lightState;
    flickerTime = millis();
    i++;
    
  }
}

void trigger(short trig_time, short reload) {
  adjust = digitalRead(buttpin);

  if (adjust != lastButtonState) {
    lastDebounceTime = millis();
  }
  
  if ((millis() - lastDebounceTime) > 50) {
    
    if (adjust != buttonState) {
      buttonState = adjust;
  
      if ((buttonState == LOW) && (millis() > 500)) {
        highTime = millis();
      }
    }
  }
  lastButtonState = adjust;

  if ((millis() - highTime <= trig_time)&&(millis() > 500)) {
    if (highTime-lasthighTime >= reload) {
      digitalWrite(laserpin, HIGH);
      lasthighTime = highTime;
    }
    digitalWrite(indipin, LOW);
  }
  else {
    digitalWrite(laserpin, LOW);
    digitalWrite(indipin, HIGH);
  }
}

// Set all LEDs to a given color and apply it (visible)
void setLightning (byte red, byte green, byte blue) {
  for(byte i = 0; i < NUM_LEDS; i++ ) {
    lightning_strip.setPixelColor(i, lightning_strip.Color(red, green, blue));
  }
  lightning_strip.show();
}

// Set all LEDs to a given color and apply it (visible)
void setMom (byte red, byte green, byte blue) {
  for(byte i = 0; i < 2; i++ ) {
    mom.setPixelColor(i, mom.Color(red, green, blue));
  }
  mom.show();
}

// Set all LEDs to a given color and apply it (visible)
void setMelody (byte red, byte green, byte blue) {
  for(byte i = 0; i < 2; i++ ) {
    melody.setPixelColor(i, melody.Color(red, green, blue));
  }
  melody.show();
}

// rdtsc.cpp
// processor: x86, x64
#include <stdio.h>
#include <intrin.h>

#pragma intrinsic(__rdtsc)

int main()
{
    unsigned __int64 i;
    i = __rdtsc();
    printf_s("%I64d ticks\n", i);
}

static void Main(string[] args)
{
    Action<int> firstAction = DoWorkWithOneParameter;
    Action<int, int> secondAction = DoWorkWithTwoParameters;
    Action<int, int, int> thirdAction = DoWorkWithThreeParameters;

    firstAction(1); // Print 1
    secondAction(1, 2); // Print 1-2
    thirdAction(1, 2, 3); //Print 1-2-3
}

public static void DoWorkWithOneParameter(int arg)
{
    Console.WriteLine(arg);
}

public static void DoWorkWithTwoParameters(int arg1, int arg2)
{
    Console.WriteLine(arg1 + "-" + arg2);
}

public static void DoWorkWithThreeParameters(int arg1, int arg2, int arg3)
{
    Console.WriteLine(arg1 + "-" + arg2 + "-" + arg3);
}

static void Main(string[] args)
{
    Action act = () =>
    {
        Console.WriteLine("No Parameter");
    };

    Action<int> actWithOneParameter = (arg1) =>
        {
            Console.WriteLine("Par: " + arg1);
        };

    Action<int, int> actWithTwoParameter = (arg1, arg2) =>
        {
            Console.WriteLine("Par1: " + arg1 + ", Par2: " + arg2);
        };

    act();
    actWithOneParameter(1);
    actWithTwoParameter(1, 2);
}

using System;

namespace pass_function_as_parameter
{
    class Program
    {
        static int functionToPass(int x)
        {
            return x + 10;
        }
        static void function(Func<int, int> functionToPass)
        {
            int i = functionToPass(22);
            Console.WriteLine("i = {0}", i);
        }
        static void Main(string[] args)
        {
            function(functionToPass);
        }
    }
}

using System;

namespace pass_function_as_parameter
{
    class Program
    {
        static void functionToPass2(int x)
        {
            int increment = x + 10;
            Console.WriteLine("increment = {0}",increment);
        }
        static void function2(Action<int> functionToPass2)
        {
            functionToPass2(22);
        }
        static void Main(string[] args)
        {
            function2(functionToPass2);
        }
    }
}

#include<stdio.h>
#include<string.h>

int check_fibonacci(int fibonacci[], int total)
{
    int i, j, result, sum;

    for(i = 0, j = 2; i < total - 2; i++,j++)
    {
        sum = fibonacci[i] + fibonacci[i+1];

        if(fibonacci[j] == sum)
        {
           result = 1;
        }
        else
        {
            result = 0;
        }
    }
    return result;
}


void main()
{

  int total;
  printf("co bao nhieu so : ");
  scanf("%d", &total);
  int fibonacci[total];

  for(int i = 0; i < total; i++)
  {
      printf("fibonacci %d = ", i + 1);
      scanf("%d", &fibonacci[i]);
  }

   if(check_fibonacci(fibonacci, total) == 1)
   {
       printf("\nla day so fibonacci");
   }
   else
   {
      printf("\nkhong phai day so fibonacci");
   }

}

$ gcc -shared libanswer.so answer.c

vector* sum( vector* v, int n ) {
    vector* r = ( vector* )( malloc( sizeof( vector ) ) );
    for( i = 0; i < n; i++ ) {
        r = add( r, v + i );
    }
    
    return r;
}

typedef struct __vector {
    int x;
    int y;
} vector;

vector* add( vector* a, vector* b ) {
    vector* r = ( vector* )( malloc( sizeof( vector ) ) );
    r->x = a->x + b->x;
    r->y = a->y + b->y;
    
    return r;
}

a = a ^ b;
b = a ^ b;
a = a ^ b;

#include<stdio.h>
#include<windows.h>



void ReadWay(int number)
{
SetConsoleOutputCP(65001);
     int ways;
      ways = number/10;

      switch(ways)
      {

        case 1:
            printf("mười ");
            break;
        case 2:
            printf("hai ");
            break;
        case 3:
            printf("ba ");
            break;
        case 4:
            printf("bốn ");
            break;
        case 5:
            printf("năm ");
            break;
        case 6:
            printf("sáu ");
            break;
        case 7:
            printf("bảy ");
            break;
        case 8:
            printf("tám ");
            break;
        case 9:
            printf("chín ");
            break;
      }

      ways = number%10;
      switch(ways)
      {
        case 0:
            ways = number/10;
            if(ways == 1)
            {
                printf("");
            }
            else
            {
               printf("mươi ");
            }

            break;
        case 1:
            ways = number/10;
            if(ways == 1)
            {
                printf("một");
            }
            else
            {
               printf("mươi mốt");
            }

            break;
        case 2:
            ways = number/10;
            if(ways == 1)
            {
                printf("hai");
            }
            else
            {
                printf("mươi hai");
            }

            break;
        case 3:
            ways = number/10;
            if(ways == 1)
            {
                printf("ba");
            }
            else
            {
                printf("mươi ba");
            }

            break;
        case 4:
            ways = number/10;
            if(ways == 1)
            {
                printf("bốn");
            }
            else
            {
                printf("mươi bốn");
            }

            break;
        case 5:
            ways = number/10;
            if(ways == 1)
            {
                printf("lăm");
            }
            else
            {
               printf("mươi lăm");
            }

            break;
        case 6:
            ways = number/10;
            if(ways == 1)
            {
                printf("sáu");
            }
            else
            {
                printf("mươi sáu");
            }

            break;
        case 7:
            ways = number/10;
            if(ways == 1)
            {
                printf("bảy");
            }
            else
            {
                printf("mươi bảy");
            }

            break;
        case 8:
            ways = number/10;
            if(ways == 1)
            {
                printf("tám");
            }
            else
            {
               printf("mươi tám");
            }

            break;
        case 9:
            ways = number/10;
            if(ways == 1)
            {
                printf("chín");
            }
            else
            {
               printf("mươi chín");
            }

            break;
      }
}


void main()
{
  SetConsoleOutputCP(65001);
  float number, save;
  save = number;
 do
{
   //check input data
   do
    {
    printf("nhập số nguyên: ");
    scanf("%f", &number);

    save = number;

        if(number != (int)number)
        {
        printf("lỗi! phải nhập số nguyên\n");
        }

    }while(number != (int)number);

   //end program
     if(number == 0)
    {
        exit(0);
    }

    system("cls");
    printf("%d đọc là: ", (int)save);

    ReadWay(number);

    printf("\n\nnếu muốn dừng chương trình! >>nhập 0<<\n\n");


}while(number != 0);


}

#include<stdio.h>

//sum
void CountTime(int day, int month, int year)
{
     int Dayth;
     printf("%d/%d/%d is: ", day, month, year);

     for(int i = 1; i < month;i++)
     {
         if( i == 1 || i == 3 || i == 5 || i == 7 || i ==  9 || i == 11)
         {
             if(month == 1)
             {
                Dayth = 0;
             }
             else
             {
                Dayth =  Dayth + 31;
             }

         }
         else if(i == 4 || i == 6 ||i == 8 || i == 10 || i == 12)
         {
             Dayth =  Dayth + 30;
         }
         else
         {
             Dayth =  Dayth + 28;
         }
     }

     printf("[%d]th day in year", Dayth + day);

}


void main()
{
  int day, month, year;


  //check input data
do
{
  do
  {
      printf("enter day: ");
      scanf("%d", &day);
      if(day > 31 || day <= 0)
      {
          printf(">>ERROR! day <= 30\n");
      }
  }while(day > 31 || day <= 0);

  do
  {
     printf("enter month: ");
     scanf("%d", &month);
     if(month > 12 || month < 1)
     {
         printf(">>ERROR! month >= 12\n");
     }
  }while(month > 12 || month < 1);

  if(month == 2 && day > 28 || month == 4 && day > 30 ||
       month == 6 && day > 30 || month == 8 && day > 30 ||
       month == 10 && day > 30 || month == 12 && day > 30)
  {
      printf(">>ERROR! day of month\n");
      printf("month [2] : 28 day\n");
      printf("month [4] [6] [8] [10] [12] : 30 day\n");
      printf("month [1] [3] [5] [7] [9] [11] : 31 day\n\n");
  }

}while(month == 2 && day > 28 || month == 4 && day > 30 ||
       month == 6 && day > 30 || month == 8 && day > 30 ||
       month == 10 && day > 30 || month == 12 && day > 30);

  do
  {
     printf("enter year: ");
     scanf("%d", &year);
     if(year < 2000)
     {
         printf(">>ERROR! year >= 2000");
     }
  }while(year < 2000);


  CountTime(day, month, year);
}

#include<stdio.h>



void NextTime(int day, int month, int year)
{
    // count day and month
    day = day + 1;
    printf("Next time: ");
    if(month == 1 || month == 3 || month == 5 || month == 7 || month == 9 || month == 11)
    {

        if(day > 31 && month < 12)
        {
           printf("1/%d/", month + 1);
        }
        else if(day <= 31 && month < 12)
        {
            printf("%d/%d/",day ,month);
        }
    }

    else if(month == 4 || month == 6 || month == 8 || month == 10 || month == 12)
    {
        if(day > 30 && month == 12)
        {
            printf("1/1/");
        }
        else if(day > 30 && month < 12)
        {
            printf("1/%d/", month + 1);
        }
        else if(day <= 30 && month <= 12)
        {
            printf("%d/%d/", day, month);
        }
    }
    else if(month == 2)
    {
        if(day > 28)
        {
        printf("1/3/");
        }
        else if(day <= 28)
        {
            printf("%d/2/", day);
        }
    }


//count year
  if( day > 30 && month == 12)
  {

     printf("%d", year + 1);
  }
  else if(day <= 31 && month < 12 || day > 31 && month < 12 )
  {
    printf("%d", year);
  }
}



void main()
{
  int day, month, year;


  //check input data
do
{
  do
  {
      printf("enter day: ");
      scanf("%d", &day);
      if(day > 31 || day <= 0)
      {
          printf(">>ERROR! day <= 30\n");
      }
  }while(day > 31 || day <= 0);

  do
  {
     printf("enter month: ");
     scanf("%d", &month);
     if(month > 12 || month < 1)
     {
         printf(">>ERROR! month >= 12\n");
     }
  }while(month > 12 || month < 1);

  if(month == 2 && day > 28 || month == 4 && day > 30 ||
       month == 6 && day > 30 || month == 8 && day > 30 ||
       month == 10 && day > 30 || month == 12 && day > 30)
  {
      printf(">>ERROR! day of month\n");
      printf("month [2] : 28 day\n");
      printf("month [4] [6] [8] [10] [12] : 30 day\n");
      printf("month [1] [3] [5] [7] [9] [11] : 31 day\n\n");
  }

}while(month == 2 && day > 28 || month == 4 && day > 30 ||
       month == 6 && day > 30 || month == 8 && day > 30 ||
       month == 10 && day > 30 || month == 12 && day > 30);

  do
  {
     printf("enter year: ");
     scanf("%d", &year);
     if(year < 2000)
     {
         printf(">>ERROR! year >= 2000");
     }
  }while(year < 2000);


  NextTime(day, month, year);
}

#include<stdio.h>



void increasing(float num1, float num2, float num3)
{
    float save = 0;
    printf("increasing: ");
    if(num1  > num2)
    {
        save = num2;
        num2 = num1;
        num1 = save;
    }
    if(num2 > num3)
    {
        save = num3;
        num3 = num2;
        num2 = save;
    }
    if(num1 > num2)
    {
        save = num2;
        num2 = num1;
        num1 = save;
    }
    printf("%.1f %.1f %.1f", num1, num2, num3);

}
void main()
{
  float num1, num2, num3;
    printf("enter number 1: ");
    scanf("%f", &num1);
    printf("enter number 2: ");
    scanf("%f", &num2);
    printf("enter number 3: ");
    scanf("%f", &num3);

  increasing(num1, num2, num3);
}

#include<stdio.h>


//change negative number to positive number
void change(float num1, float num2, float num3)
{
    printf("changed: [%.1f] [%.1f] [%.1f]", num1 * -1, num2 * -1, num3 * -1);
}
void main()
{
  float num1, num2, num3;
  printf("please enter negative numbers\n");
  
  //check input data 
  do 
  {
    printf("enter number 1: ");
    scanf("%f", &num1);
    printf("enter number 2: ");
    scanf("%f", &num2);
    printf("enter number 3: ");
    scanf("%f", &num3);

     if(num1 >= 0 || num2 >= 0 || num3 >= 0)
     {
      printf("please enter negative numbers\n");
     }
  }while(num1 >= 0);

  change(num1, num2, num3);
}

#include<stdio.h>

void main()
{
  int n, sum;
  int count = 0;
    printf("enter n: ");
    scanf("%d", &n);

    for(int i = 1; i < n;i++)
    {
      sum = sum + i;
       if(sum >= n)
       {
           break;
       }
       count = count + 1;
    }

    printf("count = %d", count);
}

#include<stdio.h>

void main()
{
  int n, sum;
    printf("enter n: ");
    scanf("%d", &n);

    for(int i = 1; i < n;i++)
    {
       if(i % 2 == 0)
       {
           continue;
       }
       sum = sum + i;
    }

    printf("sum of odd numbers = %d", sum);
}

#include<stdio.h>

void main()
{
    for(int i = 65; i <= 90;i++)
    {
       printf("%c, ", i);
    }
}

#include<stdio.h>



int FindX(int n)
{
    int sum, count;
    for(int j = 1; sum <= n;j++)
  {
    sum = sum + j;
        if(sum > n)
        {
        break;
        }
    count = count + 1;
  }
  return count;
}
void main()
{
int n;
    printf("enter n: ");
  do
   {
     scanf("%d", &n);
     if(n < 0)
       {
         printf("n must greater than 0")
       }
   }while(n < 0)
    
    printf("X = %d", FindX(n));
    getch();
}

#include<stdio.h>
#include<string.h>
#include<windows.h>

//check duplicate ID
int check_ID(int ID[], int i)
{
 int result;

 for(int j = 0; j < i; j++)
 {
    if(ID[i] == ID[j])
    {
      result = 1;
    }
 }
   return result;
}

//input student information
void InputStudentInfor(int ID[], float grade[], int total)
{

 int i, j, check_input ;
 char temp;

 for(i = 0; i < total; i++)
 {
    do
    {
       printf("\n--> Student %d | ID: ", i+1);
       fflush(stdin);
       check_input = scanf("%d%c", &ID[i], &temp);//check_input will check how many values are scanned

       if(check_input == 2 && temp != '\n' || check_input == 0)
       {
         printf("\n--- ERROR! can't enter character\n");
       }
       else if(ID[i] < 0)
       {
         printf("\n--- ERROR! please, enter positive number\n");
       }
       else if(check_ID(ID, i)== 1)
       {
         printf("\n--- Student ID already exists\n");
       }
       else
       {
         break;
       }

    }while(check_input == 2 && temp != '\n' || check_input == 0 || ID[i] < 0 || check_ID(ID, i)== 1);


    do
    {
       printf("\n--> Grade %d : ", i+1);//check_input will check how many values are scanned
       fflush(stdin);
       check_input = scanf("%f%c", &grade[i], &temp);

       if(check_input == 2 && temp != '\n' || check_input == 0 )
       {
         printf("\n--- ERROR! can't enter character\n");
       }
       else if(grade[i] < 0 || grade[i] > 10)
       {
         printf("\n--- ERROR! please, enter number from 1 to 10\n");
       }
       else
       {
         break;
       }

    }while(check_input == 2 && temp != '\n' || check_input == 0 || grade[i] < 0 || grade[i] > 10);
 }
}

//


// Output information of student entered
void OutputStudentInfor(int ID[],float grade[], int total)
{
 for(int i = 0; i < total; i++)
 {
    printf("|%d Student ID: [%d] | Grade: %.2f |\n",i+1 ,ID[i], grade[i]);
 }
}

// Find maximum grade
float FindMaxGrade(float grade[], int total)
{
 float max = grade[0];
 for(int i = 1; i < total;i++ )
 {
    if( max < grade[i])
    {
      max = grade[i];
    }
 }
    return max;
}

//Fin minimum grade
float FindMinGrade(float grade[], int total)
{
 float min = grade[0];
 for(int i = 1; i < total;i++ )
 {
    if( min > grade[i])
    {
      min = grade[i];
    }
 }
    return min;
}

void main()
{
 int total, choice, check_input;
 char temp;
 system("color 0A");//change the color of all characters to green in the console window

   // enter the number of elements of the array and check input data
 do
 {
   printf("--> Enter total number of  student: ");
   fflush(stdin);
   check_input = scanf("%d%c", &total, &temp);//check_input will check how many values are scanned

   if(check_input == 2 && temp != '\n' || check_input  == 0)
   {
     printf("\n--- ERROR! can't enter character<<\n\n");
   }
   else if(total <= 0)
   {
     printf("\n--- ERROR! please, enter value must be greater than 0\n\n");
   }
   else
   {
     break;
   }

 }while(total <= 0 || check_input == 2 && temp !='\n' || check_input == 0);

 system("cls");

 int ID[total];
 float grade[total];

 printf(">>> Enter student ID and grade\n");

 InputStudentInfor(ID, grade, total);
 system("cls");
 printf(">>> Finished entering data");
   //menu initialization
 do
 {

    printf("\n\n\n\t\tMENU");
    printf("\n****************************************\n");
    printf("* 1. Re-enter data                     *\n");
    printf("* 2. print ID and grade of student     *\n");
    printf("* 3. Find maximum grade                *\n");
    printf("* 4. Find minimum grade                *\n");
    printf("* 5. Exit                              *\n");
    printf("****************************************\n\n");

 //check input data
    do
    {
        printf("--> Enter choice: ");
        fflush(stdin);
        check_input = scanf("%d%c", &choice, &temp);//check_input will check how many values are scanned

        if(check_input == 2 && temp != '\n' || check_input  == 0)
        {
            printf("\n--- ERROR! can't enter character<<\n\n");
        }
        else if(choice > 5 || choice < 1)
        {
            printf("\n--- ERROR! please choose from 1 to 5\n\n");
        }
        else
        {
            break;
        }

    }while(check_input == 2 && temp != '\n' || check_input  == 0 ||  choice > 5 || choice < 1);

    system("cls"); //delete screen

    //function selection
    switch(choice)
    {
        case 1:
            system("cls");
            printf(">>> Re-enter data\n\n");

            InputStudentInfor(ID, grade, total);

            printf(">>> Finished entering data");
            system("cls");
            break;

        case 2:
            system("cls");
            printf(">>> List ID and grade of student\n\n\n");

            OutputStudentInfor(ID, grade, total);
            break;

        case 3:
            system("cls");
            printf(">>> Maximum grade: %.2f \n", FindMaxGrade(grade, total));
            break;

        case 4:
            system("cls");
            printf(">>> Minimum grade: %.2f \n", FindMinGrade(grade, total));
             break;

        default :
            printf("\n>>> Program has ended!\n");
            exit(0);
    }

 }while(choice <= 4);
}

uint64_t rdtsc() {
  uint32_t hi, lo;
  __asm__ __volatile__ ("rdtsc" : "=a"(lo), "=d"(hi));
 
  return ( (uint64_t)lo)|( ((uint64_t)hi)<<32 );
 }

#include "sodium.h"

int foo() {
  char myString[32];
  uint32_t myInt;
  if (sodium_init() < 0) return 1;
  randombytes_buf(myString, 32);
  myInt = randombytes_uniform(10);
}

int fd = open("/dev/urandom", O_RDONLY);
if (fd == -1)
	goto nodevurandom
if (fstat(fd, &st) == -1 || !S_ISCHR(st.st_mode)) {
	close(fd);
	goto nodevrandom;
}
if (ioctl(fd, RNDGETENTCNT, &cnt) == -1) {
	close(fd);
	goto nodevrandom;
}
ssize_t ret = read(fd, (char *)buf + i, wanted);
if (ret == -1) {
	if (errno == EAGAIN || errno == EINTR)
		continue;
		close(fd);
		goto nodevrandom;
}
close(fd);
if (gotdata(buf, len) == 0) {
	errno = save_errno;
	return 0;
}
nodevrandom:
	errno = EIO;
	return -1;

int sum_num(int num[], int total)
{
    int sum;
    for(int i = 0; i < total;i++)
    {
        sum = sum +  num[i];
    }
    return sum;
}
int findmax(int num[], int total)
{
    int max;
    max = num[0];
    for(int i = 1; i < total;i++)
    {
        if(max < num[i])
            {
                max = num[i];
            }
    }
    return max;
}
int findmin(int num[], int total)
{
    int min;
    min = num[0];
    for(int i = 1; i < total;i++)
    {
        if(min > num[i])
            {
                min = num[i];
            }
    }
    return min;
}
void main()
{
   int sum, max, min, total;
    printf("enter total: ");
    scanf("%d", &total);
   int num[total];
   for(int i = 0;i < total;i++)
   {
      printf("num %d : ",i+1);
      scanf("%d", &num[i]);
   }

   sum = sum_num(num, total);
   max = findmax(num, total);
   min = findmin(num, total);
   printf("sum = %d\n", sum);
   printf("max = %d\nmin = %d", max, min);
}

#include<stdio.h>



int findexpon(int number, int index)
{
    int expon = 1;
    for(int i = 1; i <= index; i++)
    {
        expon = expon  * number;
    }

    return expon;
}

int finfact(int number)
{
    int sum;
    int fact = 1;
    for(int i = 1; i <= number; i++)
    {
        fact = fact * i ;
    }
    return fact;
}

void main()
{
    int number, fact, index, expon;
    printf("enter value :  ");
    scanf("%d", &number);
    printf("enter exponential: ");
    scanf("%d", &index);

    expon = findexpon(number, index);
    fact = finfact(number);
    
    if(index > 0)
      {
        printf("%d! = %d\n",number, fact);
        printf("%d^%d = %d", number, index, expon);
      }
    else
      {
        printf("enter exponential > 0")
      }


}

#include<stdio.h>
#include<stdbool.h>
#include<conio.h>
#include<math.h>
#include<string.h>

void main()
{
    float s, r, p;
    float area(float r);
    float perimeter(float r);
    printf("enter radius: ");
    scanf("%f", &r);
    s = area(r);
    p = perimeter(r);
    printf("area of circle is %f", s);
    printf("\nPerimeter of circle is %f", p);


}

float area(float r)
{
    float s;
    s = 3.14 * r * r;
    return s;
}

float perimeter(float r)
{
    float p = 2 * 3.14 * r;
    return p;

}

#include<stdio.h>
#include<stdbool.h>
#include<conio.h>
#include<math.h>
#include<string.h>

void main()
{
   int num1, num2, sum;
   char math;
   printf("Enter num 1: ");
   scanf("%d", &num1);
   printf("enter num 2: ");
   scanf("%d", &num2);
   fflush(stdin);
   printf("Enter calculation : ");
   scanf("%C", &math);
   switch(math)
   {
       case '+':
       sum = add(num1, num2);
       printf("%d + %d = %d",num1 ,num2, sum);
       break;
       case '-':
       sum = sub(num1, num2);
       printf("%d - %d = %d",num1 ,num2, sum);
   }




}

int add(int a, int b)
{
     int sum;
     sum = a + b;
    return sum;
}

int sub(int a, int b)
{
    int sum;
    a - b;
    return sum;
}

#include<stdio.h>

void main()
{
int month;
    printf("enter month: ");
    do
    {
       scanf("%d", &month);
       if(month <= 0 || month > 12)
       {
           printf("enter month from 1 to 12\n");
           printf("enter month: ");
       }
    }while(month <= 0 || month > 12);

  if(month == 1 || month == 2 || month == 3 )
  {
     printf("%d month is the 1st quarter", month);
  }
  else if(month == 4 || month == 5 || month == 6)
  {
     printf("%d month is the sendcon quarter", month);
  }
  else if(month == 7 || month == 8 || month == 9)
  {
     printf("%d month is the third quarter", month);
  }
  else
  {
     printf("%d month is the fourth quarter", month);
  }
}

#include<stdio.h>
#include<stdbool.h>
#include<conio.h>
#include<math.h>
#include<string.h>
//đếm số lượng chữ số của số nguyên dương
void main()
{
   int n;
   int i;
   int count = 0;
   printf("enter number: ");
   scanf("%d", &n);

   for(i = 1; i <= n; i++)
   {
    count++;
    n = n/10;
   }
    printf("entered number has %d digits", count+1);
    getch();
}

#include<stdio.h>
#include<stdbool.h>
#include<conio.h>
#include<math.h>
#include<string.h>

void main()
{
   int number;  
   int i, surplus, sum; 

   printf("enter number: "); // nhập số cần đảo ngược
   scanf("%d", &num);
   printf("how many digits in the entered number : ");
   scanf("%d", &sum);

   printf("reversed number of %d is ", num);
   for (i = 1; i <= sum;i++)
   {
       surplus = num%10;   // tìm số dư của số đã cho và in lần lượt sẽ được số đảo ngược
       printf("%d", surplus);
       num = num/10;
   }
  
    getch();
}

#include<stdio.h>
#include<stdbool.h>
#include<conio.h>
#include<math.h>
#include<string.h>

void main()
{
   int temp, i, j;
   temp = 0;
   char chars[20];

    printf("enter chars : ");
    gets(chars);

    if(chars[0] != 'G')
    {
        temp = 1;

    }
    else if (chars[1] != 'C')
    {
        temp = 1;

    }
    else
    {
        for (i = 2; i < strlen(chars);i++)
        {

            if(isdigit(chars[i]) == 0)
                {
                    temp = 1;
                }
                break;
        }
    }

     if ( temp == 0)
     {
         printf("student ID: ");
         puts(chars);
     }
     else
     {
        printf("enter error");
     }

    getch();

}

#include<stdio.h>
#include<stdbool.h>
#include<conio.h>
#include<math.h>
#include<string.h>

void main()
{
   int temp, i, j;
   temp = 0;
   char chars[20];

    printf("enter chars : ");
    gets(chars);

    for(i = 0, j = strlen(chars)-1; i < j; i++, j--)
    {
        if(chars[i] != chars[j])
        {
            temp = 1;
            break;
        }
    }

     if ( temp == 0)
     {
         printf("symmetric chain");
     }
     else
     {
        printf("not symmetric chain");
     }

    getch();

}

#include<stdio.h>
#include<stdbool.h>
#include<conio.h>
#include<math.h>
#include<string.h>

void main()
{
   int result;
   char studentID[20];

   printf("enter ID length  must is 7 characters: ");
A:
   gets(studentID);

   result = strlen(studentID);

   if(result == 7)
   {
       printf("true");
   }
   else
   {
       printf("ID length  must is 7 characters\n");
       printf("re-enter : ");
       goto A;
   }

    getch();

}

#include<stdio.h>
#include<stdbool.h>
#include<conio.h>
#include<math.h>
#include<string.h>

void main()
{
   int choice;
   int choose;
   char str1[20], str2[20];

   printf("enter string 1: ");
   gets(str1);
   printf("enter string 2: ");
   gets(str2);


  do
  {
   printf("\n");
   printf("==========================\n");
   printf("= 1. compare two strings =\n");
   printf("= 2. copy string         =\n");
   printf("= 3. concatenation       =\n");
   printf("= 4. exit                =\n");
   printf("==========================\n");

   printf("choice: ");
   scanf("%d", &choice);
   int result;

   switch(choice)
   {
   case 1:
    result = strcmp(str1, str2);
    if(result == 0)
    {
        printf("two strings is equal");
    }
    if (result > 0)
    {
       printf("string 1 > string 2");
    }
    else
    {
        printf("string 1 < string 2");
    }
    break;
   case 2:
       printf("you wants copy string 1 into 2(input: 1)or 2 into 1(input 2) ?\n");
       printf("choose: ");
       scanf("%d", &choose);
        if(choose == 2)
        {
            strcpy(str1, str2);
            printf("string 2: ");
            puts(str2);
            printf("string 1: ");
            puts(str1);

        }
        else
        {
            strcpy(str2, str1);
            printf("string 2: ");
            puts(str2);
            printf("string 1: ");
            puts(str1);
        }
        break;
   case 3:
        printf("you wants concatenation string 1 into 2(input: 1)or 2 into 1(input 2) ?\n");
        printf("choose: ");
         scanf("%d", &choose);
        if(choose == 2)
        {
            strcat(str1, str2);
            printf("string 1:");
            puts(str1);
        }
        else
        {
            strcat(str2, str1);
            printf ("string 2: ");
            puts(str2);

        }
    break;
   default :
       exit(0);
    break;
   }

  }while( choice <= 3);






    getch();

}

#include<stdio.h>
#include<stdbool.h>
#include<conio.h>
#include<math.h>
#include<string.h>

void main()
{
   char str[5][20];
   int i;

   for (i = 0; i < 5; i++)
   {
     printf("enter string %d: ", i+1);
     gets(str[i]);
   }

   for(i = 0;i<5;i++)
   {
      printf("string entered %: ", i+1);
      puts(str[i]);
   }


    getch();

}

#include<stdio.h>
#include<math.h>
#include<stdbool.h>
void main()
{
    int a[20];
    int j, i, k, h, save;

    i = -1;

    do
    {
        i++;
        printf("enter value a  %d = ", i + 1);
        scanf("%d", &a[i]);
    }while(a[i] >= 0);

    for (k = 0; k < i - 1; k++)
    {
        for (h =k + 1; h < i; h++)
        {
             if(a[k]>a[h])
             {
                save = a[k];
                a[k] = a[h];
                a[h] = save;
             }
        }
    }

   printf("a = ");
   for ( j = 0; j < i; j++ )
      printf("%d\t", a[j]);

  getch();
}

#include<stdio.h>
#include<math.h>
#include<stdbool.h>
void main()
{
    int A[20] ;
    int B[20];
    int i, j, n;

    printf("enter value n : ");
    scanf("%d", &n);


    for( i = 0; i < n; i++)
    {
        printf("A %d = ", i + 1);
        scanf("%d", &A[i]);



    }


        for (i = n-1, j = 0; i >= 0;i--, j++)
    {
        B[j] = A[i];

    }

    printf("B = ");
    for (j = 0; j < n;j++)
    {
        printf(" %d", B[j]);
    }


  getch();
}

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
 
#define MY_TMP_FILE "/tmp/file.tmp"
 
 
int main(int argc, char* argv[])
{
    FILE * f;
    if (!access(MY_TMP_FILE, F_OK)) {
        printf external link("File exists!\n");
        return EXIT_FAILURE;
    }
    tmpFile = fopen(MY_TMP_FILE, "w");
 
    if (tmpFile == NULL) {
        return EXIT_FAILURE;
    }
 
    fputs("Some text...\n", tmpFile);
 
    fclose(tmpFile);
 
    return EXIT_SUCCESS;
}

#include <stdio.h>
int main () {
    char username[8];
    int allow = 0;
    printf external link("Enter your username, please: ");
    gets(username);
    if (grantAccess(username)) {
        allow = 1;
    }
    if (allow != 0) {
        privilegedAction();
    }
    return 0;
}

#define R(a,b) (((a) << (b)) | ((a) >> (32 - (b))))
void salsa20_word_specification(uint32 out[16],uint32 in[16])
{
    int i;
    uint32 x[16];
    for (i = 0;i < 16;++i) x[i] = in[i];
    for (i = 20;i > 0;i -= 2) {
        x[ 4] ^= R(x[ 0]+x[12], 7);  x[ 8] ^= R(x[ 4]+x[ 0], 9);
        x[12] ^= R(x[ 8]+x[ 4],13);  x[ 0] ^= R(x[12]+x[ 8],18);
        x[ 9] ^= R(x[ 5]+x[ 1], 7);  x[13] ^= R(x[ 9]+x[ 5], 9);
        x[ 1] ^= R(x[13]+x[ 9],13);  x[ 5] ^= R(x[ 1]+x[13],18);
        x[14] ^= R(x[10]+x[ 6], 7);  x[ 2] ^= R(x[14]+x[10], 9);
        x[ 6] ^= R(x[ 2]+x[14],13);  x[10] ^= R(x[ 6]+x[ 2],18);
        x[ 3] ^= R(x[15]+x[11], 7);  x[ 7] ^= R(x[ 3]+x[15], 9);
        x[11] ^= R(x[ 7]+x[ 3],13);  x[15] ^= R(x[11]+x[ 7],18);
        x[ 1] ^= R(x[ 0]+x[ 3], 7);  x[ 2] ^= R(x[ 1]+x[ 0], 9);
        x[ 3] ^= R(x[ 2]+x[ 1],13);  x[ 0] ^= R(x[ 3]+x[ 2],18);
        x[ 6] ^= R(x[ 5]+x[ 4], 7);  x[ 7] ^= R(x[ 6]+x[ 5], 9);
        x[ 4] ^= R(x[ 7]+x[ 6],13);  x[ 5] ^= R(x[ 4]+x[ 7],18);
        x[11] ^= R(x[10]+x[ 9], 7);  x[ 8] ^= R(x[11]+x[10], 9);
        x[ 9] ^= R(x[ 8]+x[11],13);  x[10] ^= R(x[ 9]+x[ 8],18);
        x[12] ^= R(x[15]+x[14], 7);  x[13] ^= R(x[12]+x[15], 9);
        x[14] ^= R(x[13]+x[12],13);  x[15] ^= R(x[14]+x[13],18);
    }
    for (i = 0;i < 16;++i) out[i] = x[i] + in[i];
}

i = 0
j = 0
for b in range(m):
    i = (i + 1) % 256
    j = (j + S[i]) % 256
    S[i], S[j] = S[j], S[i]
    KS[b] = S[(S[i] + S[j]) % 256]

j = 0;
S = range(256)
for i in range(256):
    j = (j + S[i] + K[i%n]) % 256
    S[i], S[j] = S[j], S[i]

#include <stdio.h>
int main()
{
	int lenght,bredth;
	int end;
	printf("what is the lenght of the rectangle \n");
	scanf("%d",&lenght);
	printf("what is the bredth of rectangle \n");
    scanf("%d",&bredth);
    printf("area of rectangle = %d \n",lenght*bredth);
    printf("Programe By Aaryan \n");
    printf("press any key to proseed");
    scanf("%d",&end);
	return 0;
} 

#include<stdio.h>
#define take(n) scanf("%d",&n);
#define rep(i,a,b) for(int i=a;i<b;i++)
void add_10(int n){
    printf("Enter a number\n");
    int x;
    take(x);
    printf("%d+%d=%d\n",n,x,n+x);
}
void multiply_10(int n){
    printf("Enter a number\n");
    int x;
    take(x);
    printf("%d*%d=%d\n",n,x,n*x);
}

int main()
{
    int n=10;
    char choice;
    int flag=0;
    do{
        printf("Enter your choice either a or b, any other to exit\n");
        scanf("%c",&choice);
        switch(choice){
            case 'A':
            case 'a': add_10(n);
            break;
            case 'B':
            case 'b': multiply_10(n);
            break;
            default: flag=1;
        }
    }while(flag==0);
return 0;
}

#include<stdio.h>
typedef struct student{
    int roll;
    char name[100];
    int marks[3];
}st;
void takeinput(st candidate[]){
     for(int i=0;i<5;i++){
        printf("\nFor student %d\n",i+1);
        printf("Enter the following details\n");
        printf("roll:");
        scanf("%d",&candidate[i].roll);
        printf("name:");
        scanf("%s",candidate[i].name);
        for(int j=0;j<3;j++){
            printf("marks in subject %d:",j+1);
            scanf("%d",&candidate[i].marks[j]);
        }
     }
}
void printinput(st candidate[]){
    printf("The details of all the students are as follows\n");
    for(int i=0;i<5;i++){
        printf("\nroll no:%d\nname:%s\n",candidate[i].roll,candidate[i].name);
        for(int j=0;j<3;j++){
            printf("marks in subject %d:%d\n",j+1,candidate[i].marks[j]);
        }
    }
}
void average_st_mks(st candidate[]){
    printf("Enter the serial number(1-5) of the student whose average marks to be known\n");
    int no;
    scanf("%d",&no);
    int sum=0;
    for(int i=0;i<3;i++) sum+=candidate[no-1].marks[i];
    float avg=(float)sum/3;
    printf("The average marks candidate bearing roll:%d is %.2f\n",candidate[no-1].roll,avg);
}
void average_subj_mks(st candidates[]){
    printf("Enter the serial number(1-3) of the subject whose average is to be known\n");
    int subject_number;
    scanf("%d",&subject_number);
    int sum=0;
    for(int i=0;i<5;i++){
        sum+=candidates[i].marks[subject_number-1];
    }
    float avg=(float)sum/5;
    printf("The average score of students in subject no:%d is %.2f\n",subject_number,avg);
}
void swap(st *candidate){
    printf("Enter the serial number(1-5) of student whose subject marks are to be swapped\n");
    int i;
    scanf("%d",&i);
    printf("Enter the serial number(1-3) of two subjects whose marks to be swapped\n");
    int a,b;
    scanf("%d%d",&a,&b);
    int temp=candidate[i-1].marks[a-1];
    candidate[i-1].marks[a-1]=candidate[i-1].marks[b-1];
    candidate[i-1].marks[b-1]=temp;
}
void print_mks_student(st candidate[]){
    printf("Enter the serial number(1-5) of the student you want to print marks\n");
    int n;
    scanf("%d",&n);
    for(int i=0;i<3;i++){
        printf("subject %d: %d mks\n",i+1,candidate[n-1].marks[i]);
    }
}
void upp_to_low(st candidate[]){
    printf("Enter the serial number(1-5) of student you want to convert name to lowercase\n");
    int n;
    scanf("%d",&n);
    int i=0;
    do{
        char ch=candidate[n-1].name[i];
        if(ch>=65 && ch<=90) candidate[n-1].name[i]=ch+32;
        i++;
    }while(candidate[n-1].name[i]!='\0');
    printf("student name changed to %s\n",candidate[n-1].name);
}
int main(){
    st candidate[5];
    int flag=1;
    char choice;
    do{
        printf("\nEnter the choice from the menu as per mentioned in the question paper\n");
        printf("The choice should be between a-g(lowercase)\nEnter any other character to stop the program\n");
        scanf(" %c",&choice);
        switch(choice){
        case 'a':takeinput(candidate);
        break;
        case 'b':printinput(candidate); 
        break;
        case 'c':average_st_mks(candidate);
        break;
        case 'd':average_subj_mks(candidate);
        break;
        case 'e':swap(candidate);
        break;
        case 'f':print_mks_student(candidate);
        break;
        case 'g':upp_to_low(candidate);
        break;
        default: flag=0;
        }
    }while(flag==1);
    return 0;
}

class int_ptr_wrapper
{
public:
    int_ptr_wrapper(int value = 0) :
    mInt(new int(value))
    {}

    // note! needs copy-constructor and copy-assignment operator!

    ~int_ptr_wrapper()
    {
        delete mInt;
    }

private:
    int* mInt;
};

class Wrapper
{
 private:
  CLib *lib;

 public:
  Wrapper() { lib = lib_init(); } // Lib initialisieren
  ~Wrapper() { lib_cleanup(&init); } // Lib freigeben

  std::string DoSomething() 
  { 
    char *cstr = lib_get_str(); // String anfordern (malloc!)

    std::string s = str;  // in std::string kopieren

    lib_free_str(cstr); // String freigeben (free)

    return s; // std::string zurückgeben. Alles easy.
  }
};

sdk_path="/Library/Developer/CommandLineTools/SDKs"

#include <stdio.h>

int main(){
  char str[20];
  
  fgets(str, 20, stdin); // read from stdin
  puts(str); // print read content out to stdout
  
  // open the file
  FILE *f = fopen("file.txt" , "r"); 
  
  // if there was an error
  if(f == NULL){
    perror("Error opening file"); // print error
    return(-1); 
  }
  // if there was no error
  else{ 
    fgets(str, 20, f); // read from file
    puts(str); // print read content out to stdout
  }
  
  fclose(f); // close file
  
  return(0);
}

#include "SevSeg.h"
SevSeg sevseg;

int LEDRa = 33;
int LEDGa = 32;

int LEDRb = 23;
int LEDGb = 22;

int LEDRc = 50;
int LEDGc = 51;

int LEDRd = 42;
int LEDGd = 43;

int IRa1 = 44;
int IRa2 = 52;

int IRb1 = 49;
int IRb2 = 48;

int IRc1 = 35;
int IRc2 = 37;

int IRd1 = 47;
int IRd2 = 46;

int RoadATraffic[] = {0, 0};
int RoadBTraffic[] = {0, 0};
int RoadCTraffic[] = {0, 0};
int RoadDTraffic[] = {0, 0};

char jam[] = {'a', 'b', 'c', 'd', 'a', 'b', 'c', 'd', 'a', 'b', 'c', 'd', 'a', 'b', 'c', 'd'};

void setup() {
  pinMode (LEDRa, OUTPUT);
  pinMode (LEDGa, OUTPUT);

  pinMode (LEDRb, OUTPUT);
  pinMode (LEDGb, OUTPUT);

  pinMode (LEDRc, OUTPUT);
  pinMode (LEDGc, OUTPUT);

  pinMode (LEDRd, OUTPUT);
  pinMode (LEDGd, OUTPUT);

  pinMode (IRa1, INPUT);
  pinMode (IRa2, INPUT);

  pinMode (IRb1, INPUT);
  pinMode (IRb2, INPUT);

  pinMode (IRc1, INPUT);
  pinMode (IRc2, INPUT);

  pinMode (IRd1, INPUT);
  pinMode (IRd2, INPUT);

  byte numDigits = 2;
  byte digitPins[] = {11, 10};
  byte segmentPins[] = {9, 8, 6, 3, 4, 7, 2, 5};
  bool resistorsOnSegments = true;

  byte hardwareConfig = COMMON_CATHODE;
  sevseg.begin(hardwareConfig, numDigits, digitPins, segmentPins, resistorsOnSegments);
  sevseg.setBrightness(90);

  Serial.begin(9600); // open the serial port at 9600 bps:
}

static int counter = 5;
int jam_ind = 0;
int current_route = 0;

void loop() {
    //display();
    RoadATraffic[0] = (digitalRead (IRa1) != 1) ? ( 1 ) : ( 0 );
    RoadATraffic[1] = (digitalRead (IRa2) != 1) ? ( 1 ) : ( 0 );

    RoadBTraffic[0] = (digitalRead (IRb1) != 1) ? ( 1 ) : ( 0 );
    RoadBTraffic[1] = (digitalRead (IRb2) != 1) ? ( 1 ) : ( 0 );

    RoadCTraffic[0] = (digitalRead (IRc1) != 1) ? ( 1 ) : ( 0 );
    RoadCTraffic[1] = (digitalRead (IRc2) != 1) ? ( 1 ) : ( 0 );

    RoadDTraffic[0] = (digitalRead (IRd1) != 1) ? ( 1 ) : ( 0 );
    RoadDTraffic[1] = (digitalRead (IRd2) != 1) ? ( 1 ) : ( 0 );

    int sum1 = RoadATraffic[0] + RoadATraffic[1];
    int sum2 = RoadBTraffic[0] + RoadBTraffic[1];
    int sum3 = RoadCTraffic[0] + RoadCTraffic[1];
    int sum4 = RoadDTraffic[0] + RoadDTraffic[1];

    Serial.print(current_route);
    Serial.print('\n');
    Serial.print(jam_ind);
    Serial.print('\n');
    Serial.print('\n');

    change_route(jam[current_route]);
    display();
      
    if (sum1 >= sum2 && sum1 >= sum3 && sum1 >= sum4) {     // Road A Jam
      if (jam[current_route] == 'a' && counter == 1) {
        increase_jam_ind();
        jam[jam_ind] = 'a';
      } else if (jam[current_route] != 'a' && jam[jam_ind] != 'a') {
        increase_jam_ind();
        jam[jam_ind] = 'a';
      }
    }

    if (sum2 >= sum1 && sum2 >= sum3 && sum2 >= sum4) { // Road B Jam
      if (jam[current_route] == 'b' && counter == 1) {
        increase_jam_ind();
        jam[jam_ind] = 'b';
      } else if (jam[current_route] != 'b' && jam[jam_ind] != 'b') {
        increase_jam_ind();
        jam[jam_ind] = 'b';
      }
    }
    
    if (sum3 >= sum1 && sum3 >= sum2 && sum3 >= sum4) { // Road C Jam
      if (jam[current_route] == 'c' && counter == 1) {
        increase_jam_ind();
        jam[jam_ind] = 'c';
      } else if (jam[current_route] != 'c' && jam[jam_ind] != 'c') {
        increase_jam_ind();
        jam[jam_ind] = 'c';
      }
    }
      
    if (sum4 >= sum1 && sum4 >= sum2 && sum4 >= sum3) { // Road D Jam
      if (jam[current_route] == 'd' && counter == 1) {
        increase_jam_ind();
        jam[jam_ind] = 'd';
      } else if (jam[current_route] != 'd' && jam[jam_ind] != 'd') {
        increase_jam_ind();
        jam[jam_ind] = 'd';
      }
    }  
}

void display() {
  for (int h = 1; h<10000; h++){
    sevseg.setNumber(counter);
    sevseg.refreshDisplay();  
  }
  if (counter <= 0) {
    counter = 5;
    current_route++;
  }

  if (current_route > 15) { 
    current_route = 0;
  }
  
  counter--;
}

void change_route(char route) {
  switch (route) {
    case 'a':
      digitalWrite(LEDGa, HIGH);
      digitalWrite(LEDRa, LOW);
    
      digitalWrite(LEDGb, LOW);
      digitalWrite(LEDRb, HIGH);
    
      digitalWrite(LEDGc, LOW);
      digitalWrite(LEDRc, HIGH);
    
      digitalWrite(LEDGd, LOW);
      digitalWrite(LEDRd, HIGH);
      break;

    case 'b':
      digitalWrite(LEDGa, LOW);
      digitalWrite(LEDRa, HIGH);
    
      digitalWrite(LEDGb, HIGH);
      digitalWrite(LEDRb, LOW);
    
      digitalWrite(LEDGc, LOW);
      digitalWrite(LEDRc, HIGH);
    
      digitalWrite(LEDGd, LOW);
      digitalWrite(LEDRd, HIGH);
      break;

    case 'c':
      digitalWrite(LEDGa, LOW);
      digitalWrite(LEDRa, HIGH);
    
      digitalWrite(LEDGb, LOW);
      digitalWrite(LEDRb, HIGH);
    
      digitalWrite(LEDGc, HIGH);
      digitalWrite(LEDRc, LOW);
    
      digitalWrite(LEDGd, LOW);
      digitalWrite(LEDRd, HIGH);
      break;

    case 'd':
      digitalWrite(LEDGa, LOW);
      digitalWrite(LEDRa, HIGH);
    
      digitalWrite(LEDGb, LOW);
      digitalWrite(LEDRb, HIGH);
    
      digitalWrite(LEDGc, LOW);
      digitalWrite(LEDRc, HIGH);
    
      digitalWrite(LEDGd, HIGH);
      digitalWrite(LEDRd, LOW);
      break;
  }
}

void increase_jam_ind() {
  jam_ind++;
  if (jam_ind > 15) {
    jam_ind = 0;
  }
}

#include <linux/limits.h>

char current_path[PATH_MAX];