**5.21 (Display numbers in a pyramid pattern) Write a nested for loop that prints the following output:

PHOTO

Sat Oct 24 2020 17:58:24 GMT+0000 (UTC)

Saved by @mahmoud hussein #c++

#include <iostream>
#include<cmath>
#include<ctime>
#include<string>
#include <iomanip>
#include <fstream>

using namespace std;

int main()
{
	for (int i = 0; i < 8; i++)
	{
		for (int k = 0; k <= i; k++)
		{
			cout << "  ";
		}
		for (int j = i; j < 8; j++)
		{
			cout <<" "<< static_cast<char>(j+97-i);

		}
		for (int j = 7; j >= i; j--)
		{
			cout << " " << static_cast<char>(j + 97 - i);
		}
			cout << "\n";
	}
		

}

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@mahmoud hussein

(Occurrence of max numbers) Write a program that reads integers, finds the largest of them, and counts its occurrences. Assume that the input ends with number 0. Suppose that you entered 3 5 2 5 5 5 0; the program finds that the largest is 5 and the occurrence count for 5 is 4 (Fibonacci Series) The Fibonacci series is a series that begins with 0 and 1 and has the property that each succeeding term is the sum of the two preceding terms. For example, the third Fibonacci number is 1 which is sum of 0 and 1. The next is 2, which is a sum of 1 + 1. Write a program that displays the first ten numbers in a Fibonacci series **5.21 (Display numbers in a pyramid pattern) Write a nested for loop that prints the following output: (Compute the greatest common divisor) Another solution for Listing 5.10 to find the greatest common divisor (GCD) of two integers n1 and n2 is as follows: First find d to be the minimum of n1 and n2, then check whether d, d-1, d-2, . . . , 2, or 1 is a divisor for both n1 and n2 in this order. The first such common divisor is the greatest common divisor for n1 and n2. Write a program that prompts the user to enter two positive integers and displays the GCD. sorting

#include<iostream>
using namespace std;
bool issafe(int** arr,int x,int y,int n){
    for(int row=0;row<=x;row++){
        if(arr[x][y]==1){
            return false;
        }
    }
    int row=x;
    int col=y;
    while(row>=0 && col>=0){
        if(arr[row][col]==1){
            return false;
        }
        row--;
        col--;
    }
     row=x;
     col=y;
    while(row>=0 && col<n){
        if(arr[row][col]==1){
            return false;
        }
        row--;
        col++;
    }
    return true ;
}
bool nqueen(int** arr,int x,int n){
    if(x>=n){
        return true;
    }
    for(int col=0;col<=n;col++){
        if(issafe(arr,x,col,n)){
            arr[x][col]==1;
            if(nqueen(arr,x+1,n)){
                return true;
            }
            arr[x][col]=0;  //backtracking
            
        }
    }
    return false;
}
int main(){
    int n;
    cin>>n;
    int** arr=new int*[n];
    for(int i=0;i<n;i++){
        arr[i]=new int[n];
        for(int j=0;j<n;j++){
            arr[i][j]=0;

        }
    }
    if(nqueen(arr,0,n)){
        for(int i=0;i<n;i++){
            for(int j=0;j<n;j++){
                cout<<arr[i][j]<<"";
            }cout<<endl;
        }
    }


    return 0;
}

**8.11 (Game: nine heads and tails)

#include <iostream>
#include<cmath>
#include<ctime>
#include<string>
#include <iomanip>
#include <fstream>

using namespace std;




void decToBinary(int n)
{
    // array to store binary number 
    int binaryNum[3][3];
    
    //converting to binary 
    for (int i = 0; i < 3; i++) 
    {
        for (int j = 0; j < 3; j++)
        {
            binaryNum[i][j] = n % 2;
            n = n / 2;

        }
     }       

    // printing binary> array in reverse order 
    for (int i = 3-1; i >= 0; i--){
        for (int j = 3 - 1; j >= 0; j--)
        {
            if (binaryNum[i][j] == 0)
                cout << "H" << " ";
            else
                cout << "T" << " ";
        }
        cout << endl;
    }
    
 }

int main()
{
    int n;
    cout << "Enter a decimal number between 1 and 512 ";
    cin >> n;

    decToBinary(n);
    return 0;
}

yourHand_GlobalIntrerfacev1.0_firmware

///LIBRARIES & SPECIFIC PARAMETERS
#include <Arduino.h>
#include <Wire.h>
#include <Adafruit_PWMServoDriver.h>
#include <U8g2lib.h>

Adafruit_PWMServoDriver servo = Adafruit_PWMServoDriver(0x40);  //ServoMotor Driver Controller I2C Address
U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE); //OLED Constructor

//- - - - VARIABLES & METHODS - - - -//

#define jky 13              //Joystick button pin
#define emgPin A0           //EMG signal pin
#define emgThreshold 500    //EMG signal detection threshold   

/*----OLED Display & Driver----*/
void u8g2_prepare(void) {
  u8g2.setFontMode(1);              //Enable Transparent Font
  u8g2.setFont(u8g2_font_6x13_tf);  //Set font Width: 6px / Height: 13px
  u8g2.setFontRefHeightExtendedText();    
  u8g2.setFontPosTop();             //Origin Position of Text
  u8g2.setFontDirection(0);         //Font direction 0º
}
//Custom Drawn Symbols
static const unsigned char back[] U8X8_PROGMEM  = {
  0x04, 0x06, 0x7F, 0x86, 0x84, 0x60, };

/*---- Servo Driver Variables ----*/
#define Freq (uint8_t) 50     //Servo working frequency

#define posMin 102
#define posMax 512

//Finger Number Assignation for Servo Control
#define thumb (uint8_t) 0
#define index (uint8_t) 1
#define middle (uint8_t) 2 
#define ring (uint8_t) 3
#define pinky (uint8_t) 4
#define wrist (uint8_t) 5

//Method to map servo position from pulses to degrees
void setServo(uint8_t n_servo, uint8_t angulo){
  int duty;
  duty=map(angulo, 0, 180, posMin, posMax);
  servo.setPWM(n_servo, 0, duty);
}

//Method for EMG signal detection and actuation
void emg(void (*pointer)()){
  if((analogRead(A0))>emgThreshold){
    pointer();    
  }
  else{
    openHand();
  }
}

/*---- Hand Movements Methods ----*/
void closeHand(void){
    setServo(thumb,170);
    setServo(index,170);
    setServo(middle,175);
    setServo(ring,151);
    setServo(pinky,161);
    setServo(wrist,180);
}
void openHand(void){
    setServo(thumb,13);
    setServo(index,10 );
    setServo(middle,13);
    setServo(ring,13);
    setServo(pinky,13);
    setServo(wrist,180);
}
void rock_servo(void){
    setServo(thumb,170);
    setServo(index,13);
    setServo(middle,175);
    setServo(ring,151);
    setServo(pinky,13);
    setServo(wrist,180);
}
void ronaldinho_servo(){
    setServo(thumb,13);
    setServo(index,156);
    setServo(middle,145);
    setServo(ring,151);
    setServo(pinky,13);
    while(analogRead(A0)>emgThreshold){
      setServo(wrist,150);
      delay(400);
      setServo(wrist,180);
      delay(500);
    }
}
void point_servo(void){
    setServo(thumb,170);
    setServo(index,13);
    setServo(middle,145);
    setServo(ring,151);
    setServo(pinky,161);
    setServo(wrist,180);
}
void thumbsUp_servo(void){
    setServo(thumb,13);
    setServo(index,156);
    setServo(middle,145);
    setServo(ring,151);
    setServo(pinky,161);
    setServo(wrist,180);
}

/*---- Joystick Button----*/
#define jkyX A1
#define jkyY A2

uint8_t swbtn_state=0;    // Memory Storage Byte
bool btn_val=0;           // Current state of the button
bool btn_oldVal=1;        // Previous state of the button  

//Joystick Button Method
void btn_Jky(uint8_t x){
  btn_val=digitalRead(jky);   // read pin button
  if (btn_val == LOW && btn_oldVal == HIGH){
      swbtn_state=x;    
      delay(10);   
  }
  btn_oldVal=btn_val;
}

/*- *- *- *- - MENU SYSTEM - -* -* -* -*/
uint8_t M1 = 0; //Memory variable to determine menu state
uint8_t F1 = 0; //Memory variable to determine menu state
uint8_t C1 = 0; //Memory variable to determine menu state

//Mode_options
#define openClose (uint8_t) 1
#define figures (uint8_t)   2
#define custom  (uint8_t)   3

//Figures_options
#define rock (uint8_t)       1
#define ronaldinho (uint8_t) 2
#define point (uint8_t)      3
#define thumbUp (uint8_t)    4
#define goBackF1 (uint8_t)   5

//Custom_options
#define thumb (uint8_t)    1
#define index (uint8_t)    2
#define middle (uint8_t)   3
#define ring (uint8_t)     4
#define pinky (uint8_t)    5
#define wrist (uint8_t)    6
#define goBackC1 (uint8_t) 7

/*---- 1.MODES Menu Methods / All Menu Systems ----*/
/*-- Read Joystic M1 Method --*/
void jkyM1(void){
  if (analogRead(jkyX)<=341 && analogRead(jkyY)>=1010){
    M1 = openClose;
  }
  else if (analogRead(jkyX)>=342 && analogRead(jkyX)<=682 && analogRead(jkyY)>=990){
    M1 = figures;
  }
  else if (analogRead(jkyX)>=683 && analogRead(jkyX)<=1023 && analogRead(jkyY)>=980){
    M1 = custom;
  } 
}

/*---- Modes Screen Methods ----*/
void M1_openClose(void){  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(32, 45, "OPEN/CLOSE");
  
  u8g2.drawBox(8,0,31,31);   //Selected box
  u8g2.drawStr(21,9, "1");   //Selected string
  
  u8g2.drawFrame(47,0,31,31);
  u8g2.drawStr(60,9, "2");
  
  u8g2.drawFrame(86,0,31,31);
  u8g2.drawStr(99,9, "3");
  
  u8g2.sendBuffer();
}
void M1_openClose_in(){
  emg(closeHand); 
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(32, 16, "Squeeze to");
  u8g2.drawStr(32, 32, "CLOSE HAND");
  
  u8g2.sendBuffer();
}
void M1_figures(void){  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(42, 45, "FIGURES");
  
  u8g2.drawFrame(8,0,31,31);   
  u8g2.drawStr(21,9, "1");
  
  u8g2.drawBox(47,0,31,31);   //Selected box
  u8g2.drawStr(60,9, "2");    //Selected string
  
  u8g2.drawFrame(86,0,31,31);
  u8g2.drawStr(99,9, "3");
  
  u8g2.sendBuffer();
}
void M1_custom(void){  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(19, 45, "CUSTOM MOVEMENT");
  
  u8g2.drawFrame(8,0,31,31);   
  u8g2.drawStr(21,9, "1");
  
  u8g2.drawFrame(47,0,31,31);   
  u8g2.drawStr(60,9, "2");
  
  u8g2.drawBox(86,0,31,31);   //Selected box
  u8g2.drawStr(99,9, "3");    //Selected string
  
  u8g2.sendBuffer();
}

//MAIN MENU SYSTEM(MODES) METHOD
void modes_M1(){  
  switch (M1){
    case openClose:
      if(swbtn_state==1){
        M1_openClose_in();
        btn_Jky(0);
      }
      else{
        jkyM1();
        openHand();
        M1_openClose();
        btn_Jky(1);
      }
      break;

    case figures:
      if(swbtn_state==2 || swbtn_state==3){
        figures_F1();
      }
      else{
        jkyM1();
        openHand();
        M1_figures();
        btn_Jky(2);
      }
      break;

    case custom:
      if(swbtn_state==4 || swbtn_state==5){
        custom_C1();
      }
      else{
        jkyM1();
        openHand();
        M1_custom();
        btn_Jky(4);
      }
      break;
  }
}

/*---- 2.FIGURES Menu Methods ----*/
/*-- Read Joystic F1 Method --*/
void jkyF1(void){
  if (analogRead(jkyX)<=150 && analogRead(jkyY)>=1022){
    F1 = rock;
  }
  else if (analogRead(jkyX)>=151 && analogRead(jkyX)<=540 && analogRead(jkyY)>=1022){
    F1 = ronaldinho;
  }
  else if (analogRead(jkyX)>=541 && analogRead(jkyX)<=767 && analogRead(jkyY)>=1022){
    F1 = point;
  }
  else if (analogRead(jkyX)>=768 && analogRead(jkyX)<=1023 && analogRead(jkyY)>=1022){
    F1 = thumbUp;
  }
  else if (analogRead(jkyX)>=400 && analogRead(jkyX)<=1023 && analogRead(jkyY)<=400){
    F1 = goBackF1;
  } 
}

/*---- Figures Screen Methods ----*/
void F1_rock(void){  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(32, 32, "ROCK'N ROLL");
  
  u8g2.drawBox(11,0,17,17);   //Selected box
  u8g2.drawStr(17,2, "1");    //Selected string 
  
  u8g2.drawFrame(39,0,17,17);
  u8g2.drawStr(45,2, "2");
  
  u8g2.drawFrame(67,0,17,17);
  u8g2.drawStr(73,2, "3");
  
  u8g2.drawFrame(95,0,17,17);
  u8g2.drawStr(101,2, "4");

  u8g2.drawFrame(115,51,12,10);
  u8g2.drawXBMP(117, 53, 8, 6, back);
  
  u8g2.sendBuffer();

}
void F1_rock_in(void){
  emg(rock_servo);
  btn_Jky(2);
  u8g2.clearBuffer();
  
  u8g2.drawStr(32, 16, "Squeeze to");
  u8g2.drawStr(32, 32, "ROCK'N ROLL");
  
  u8g2.sendBuffer();
}
void F1_ronaldinho(void){  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(34, 32, "RONALDINHO");
  
  u8g2.drawFrame(11,0,17,17);
  u8g2.drawStr(17,2, "1");
  
  u8g2.drawBox(39,0,17,17);   //Selected box
  u8g2.drawStr(45,2, "2");    //Selected string
  
  u8g2.drawFrame(67,0,17,17);
  u8g2.drawStr(73,2, "3");
  
  u8g2.drawFrame(95,0,17,17);
  u8g2.drawStr(101,2, "4");

  u8g2.drawFrame(115,51,12,10);
  u8g2.drawXBMP(117, 53, 8, 6, back);
  
  u8g2.sendBuffer();
}
void F1_ronaldinho_in(void){
  emg(ronaldinho_servo);
  btn_Jky(2);
  u8g2.clearBuffer();
  
  u8g2.drawStr(32, 32, "RONALDINHO!");
  
  u8g2.sendBuffer();
}
void F1_point(void){  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(49, 32, "POINT");
  
  u8g2.drawFrame(11,0,17,17);
  u8g2.drawStr(17,2, "1");
  
  u8g2.drawFrame(39,0,17,17);     
  u8g2.drawStr(45,2, "2");
  
  u8g2.drawBox(67,0,17,17);   //Selected box
  u8g2.drawStr(73,2, "3");    //Selected string
  
  u8g2.drawFrame(95,0,17,17);
  u8g2.drawStr(101,2, "4");

  u8g2.drawFrame(115,51,12,10);
  u8g2.drawXBMP(117, 53, 8, 6, back);
  
  u8g2.sendBuffer();
}
void F1_point_in(void){
  emg(point_servo);
  btn_Jky(2);
  u8g2.clearBuffer();
  
  u8g2.drawStr(32, 16, "Squeeze to");
  u8g2.drawStr(49, 32, "POINT");
  
  u8g2.sendBuffer();
}
void F1_thumbUp(){  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(39, 32, "THUMBS UP");
  
  u8g2.drawFrame(11,0,17,17);
  u8g2.drawStr(17,2, "1");
  
  u8g2.drawFrame(39,0,17,17);     
  u8g2.drawStr(45,2, "2");
  
  u8g2.drawFrame(67,0,17,17);     
  u8g2.drawStr(73,2, "3");
  
  u8g2.drawBox(95,0,17,17);     //Selected box
  u8g2.drawStr(101,2, "4");     //Selected string
  
  u8g2.drawFrame(115,51,12,10);
  u8g2.drawXBMP(117, 53, 8, 6, back);
  
  u8g2.sendBuffer();
}
void F1_thumbUp_in(void){
  emg(thumbsUp_servo);
  btn_Jky(2);
  u8g2.clearBuffer();
  
  u8g2.drawStr(20, 16, "Squeeze to give");
  u8g2.drawStr(32, 30, "a THUMBS UP");
  
  u8g2.sendBuffer();
}
void F1_goBack(void){
  btn_Jky(0);  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(42, 32, "GO BACK");
  
  u8g2.drawFrame(11,0,17,17);
  u8g2.drawStr(17,2, "1");
  
  u8g2.drawFrame(39,0,17,17);     
  u8g2.drawStr(45,2, "2");
  
  u8g2.drawFrame(67,0,17,17);     
  u8g2.drawStr(73,2, "3");
  
  u8g2.drawFrame(95,0,17,17);
  u8g2.drawStr(101,2, "4");    

  u8g2.drawBox(115,51,12,10);   //Selected box
  
  u8g2.setDrawColor(0);
  u8g2.drawXBMP(117, 53, 8, 6, back);
  
  u8g2.sendBuffer();
}

//MAIN FIGURES METHOD
void figures_F1(){
  switch (F1){
    case rock:
      if(swbtn_state==3){ //s'ha de canviar!!
        F1_rock_in();
      }
      else{
        btn_Jky(3);
        jkyF1();
        F1_rock();  //print on display F1_rock
      }
      break;
    
    case ronaldinho: 
      if(swbtn_state==3){ //s'ha de canviar!!
        F1_ronaldinho_in(); 
      }
      else{
        btn_Jky(3);
        jkyF1();
        F1_ronaldinho(); //print on display F1_ronaldinho
      }
      break;
    
    case point:
      if(swbtn_state==3){ //s'ha de canviar!!
        F1_point_in(); 
      }
      else{
        btn_Jky(3);
        jkyF1();
        F1_point(); //print on display F1_ronaldinho
      }
      break;

     case thumbUp:
      if(swbtn_state==3){ //s'ha de canviar!!
        F1_thumbUp_in(); 
      }
      else{
        btn_Jky(3);
        jkyF1();
        F1_thumbUp(); //print on display F1_ronaldinho
      }
      break;

     case goBackF1:
        jkyF1();
        F1_goBack(); //print on display F1_ronaldinho
      break;
  }
}

/*---- 3.CUSTOM Menu Methods ----*/
/*-- Read Joystic C1 Method --*/
void jkyC1(void){
  if (analogRead(jkyX)<=170 && analogRead(jkyY)>=1023){
    C1 = thumb;
  }
  else if (analogRead(jkyX)>=171 && analogRead(jkyX)<=341 && analogRead(jkyY)>=1023){
    C1 = index;
  }
  else if (analogRead(jkyX)>=342 && analogRead(jkyX)<=511 && analogRead(jkyY)>=1023){
    C1 = middle;
  }
  else if (analogRead(jkyX)>=512 && analogRead(jkyX)<=682 && analogRead(jkyY)>=1023){
    C1 = ring;
  }
  else if (analogRead(jkyX)>=683 && analogRead(jkyX)<=853 && analogRead(jkyY)>=1023){
    C1 = pinky;
  }
  else if (analogRead(jkyX)>=854 && analogRead(jkyX)<=1023 && analogRead(jkyY)>=1023){
    C1 = wrist;
  }
  else if (analogRead(jkyX)>=512 && analogRead(jkyX)<=1023 && analogRead(jkyY)<=450){
    C1 = goBackC1;
  }
}
/*-- Movement State for Individual Fingers Method --*/
uint8_t movement=0;
void jky_servo_movement(void){
    if(analogRead(jkyY)>=600){
        movement=1;
    }
    else if(analogRead(jkyY)<=400){
        movement=2;
    }
    else if(analogRead(jkyY)>=401 && analogRead(jkyY)<=599){
        movement=0;
    }
}

/*---- Custom Screen Methods ----*/
void C1_thumb(void){  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(49, 32, "THUMB");
  
  u8g2.drawBox(2,0,17,17);   //Selected box
  u8g2.drawStr(8,2, "1");    //Selected string
  
  u8g2.drawFrame(23,0,17,17);
  u8g2.drawStr(29,2, "2");
  
  u8g2.drawFrame(44,0,17,17);
  u8g2.drawStr(50,2, "3");
  
  u8g2.drawFrame(65,0,17,17);
  u8g2.drawStr(71,2, "4");

  u8g2.drawFrame(86,0,17,17);
  u8g2.drawStr(92,2, "5");

  u8g2.drawFrame(107,0,17,17);
  u8g2.drawStr(113,2, "6");

  u8g2.drawFrame(115,51,12,10);
  u8g2.drawXBMP(117, 53, 8, 6, back);
  
  u8g2.sendBuffer();
}

#define thumbMin 13
#define thumbMax 170
uint8_t thumb_angle=13;
uint8_t thumb_percentage=0;

void C1_thumb_in(void){
    jky_servo_movement();
    btn_Jky(4);
    if(movement==1 && thumb_angle<thumbMax){
        thumb_angle++;
    }
    else if(movement==2 && thumb_angle>thumbMin){
        thumb_angle--;
    }
    setServo(0,thumb_angle);
    thumb_percentage=map(thumb_angle, thumbMin, thumbMax, 0, 100);
    String percentage = String(thumb_percentage);
  
    u8g2.clearBuffer();
    u8g2.setDrawColor(2);
  
    u8g2.drawStr(16, 0, "Adjust Position");

    u8g2.drawStr(12,24, "Thumb:");
    u8g2.drawStr(64,24, percentage.c_str());   //map variable for %
    u8g2.drawStr(82,24, "%");
    
    u8g2.drawFrame(12,40,102,17);
    u8g2.drawBox(13,41,thumb_percentage,15);   //x is percentage of map
    
    u8g2.sendBuffer();
  
}
void C1_index(void){  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(49, 32, "INDEX");
  
  u8g2.drawFrame(2,0,17,17);   
  u8g2.drawStr(8,2, "1");
  
  u8g2.drawBox(23,0,17,17);   //Selected box
  u8g2.drawStr(29,2, "2");     //Selected string
  
  u8g2.drawFrame(44,0,17,17);
  u8g2.drawStr(50,2, "3");
  
  u8g2.drawFrame(65,0,17,17);
  u8g2.drawStr(71,2, "4");

  u8g2.drawFrame(86,0,17,17);
  u8g2.drawStr(92,2, "5");

  u8g2.drawFrame(107,0,17,17);
  u8g2.drawStr(113,2, "6");

  u8g2.drawFrame(115,51,12,10);
  u8g2.drawXBMP(117, 53, 8, 6, back);

  u8g2.sendBuffer();
}

#define indexMin 10
#define indexMax 170
uint8_t index_angle=10;
uint8_t index_percentage=0;

void C1_index_in(){
  jky_servo_movement();
  btn_Jky(4);
  if(movement==1 && index_angle<indexMax){
      index_angle++;
  }
  else if(movement==2 && index_angle>indexMin){
      index_angle--;
  }
  setServo(1,index_angle);
  index_percentage=map(index_angle, indexMin, indexMax, 0, 100);
  String percentage = String(index_percentage);
  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(16, 0, "Adjust Position");

  u8g2.drawStr(12,24, "Index:");
  u8g2.drawStr(64,24, percentage.c_str());   //map variable for %
  u8g2.drawStr(82,24, "%");
    
  u8g2.drawFrame(12,40,102,17);
  u8g2.drawBox(13,41,index_percentage,15);   //x is percentage of map
    
  u8g2.sendBuffer();
}
void C1_middle(void){  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(47, 32, "MIDDLE");
  
  u8g2.drawFrame(2,0,17,17);   
  u8g2.drawStr(8,2, "1");
  
  u8g2.drawFrame(23,0,17,17);   
  u8g2.drawStr(29,2, "2");
  
  u8g2.drawBox(44,0,17,17);   //Selected box
  u8g2.drawStr(50,2, "3");    //Selected string
  
  u8g2.drawFrame(65,0,17,17);
  u8g2.drawStr(71,2, "4");

  u8g2.drawFrame(86,0,17,17);
  u8g2.drawStr(92,2, "5");

  u8g2.drawFrame(107,0,17,17);
  u8g2.drawStr(113,2, "6");

  u8g2.drawFrame(115,51,12,10);
  u8g2.drawXBMP(117, 53, 8, 6, back);
  
  u8g2.sendBuffer();
}

#define middleMin 13
#define middleMax 175
uint8_t middle_angle=13;
uint8_t middle_percentage=0;

void C1_middle_in(void){
  jky_servo_movement();
  btn_Jky(4);
  if(movement==1 && middle_angle<middleMax){
      middle_angle++;
  }
  else if(movement==2 && middle_angle>middleMin){
      middle_angle--;
  }
  setServo(2,middle_angle);
  middle_percentage=map(middle_angle, middleMin, middleMax, 0, 100);
  String percentage = String(middle_percentage);
  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(16, 0, "Adjust Position");

  u8g2.drawStr(12,24, "Middle:");
  u8g2.drawStr(64,24, percentage.c_str());   //map variable for %
  u8g2.drawStr(82,24, "%");
    
  u8g2.drawFrame(12,40,102,17);
  u8g2.drawBox(13,41,middle_percentage,15);   //x is percentage of map
    
  u8g2.sendBuffer();
}
void C1_ring(void){  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(52, 32, "RING");
  
  u8g2.drawFrame(2,0,17,17);   
  u8g2.drawStr(8,2, "1");
  
  u8g2.drawFrame(23,0,17,17);   
  u8g2.drawStr(29,2, "2");
  
  u8g2.drawFrame(44,0,17,17);
  u8g2.drawStr(50,2, "3");
  
  u8g2.drawBox(65,0,17,17);   //Selected box
  u8g2.drawStr(71,2, "4");    //Selected string
  
  u8g2.drawFrame(86,0,17,17);
  u8g2.drawStr(92,2, "5");

  u8g2.drawFrame(107,0,17,17);
  u8g2.drawStr(113,2, "6");

  u8g2.drawFrame(115,51,12,10);
  u8g2.drawXBMP(117, 53, 8, 6, back);
  
  u8g2.sendBuffer();
}

#define ringMin 13
#define ringMax 151
uint8_t ring_angle=13;
uint8_t ring_percentage=0;

void C1_ring_in(void){
  jky_servo_movement();
  btn_Jky(4);
  if(movement==1 && ring_angle<ringMax){
      ring_angle++;
  }
  else if(movement==2 && ring_angle>ringMin){
      ring_angle--;
  }
  setServo(3,ring_angle);
  ring_percentage=map(ring_angle, ringMin, ringMax, 0, 100);
  String percentage = String(ring_percentage);
  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(16, 0, "Adjust Position");

  u8g2.drawStr(12,24, "Ring:");
  u8g2.drawStr(64,24, percentage.c_str());   //map variable for %
  u8g2.drawStr(82,24, "%");
    
  u8g2.drawFrame(12,40,102,17);
  u8g2.drawBox(13,41,ring_percentage,15);   //x is percentage of map
    
  u8g2.sendBuffer();
}
void C1_pinky(void){  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(49, 32, "PINKY");
  
  u8g2.drawFrame(2,0,17,17);   
  u8g2.drawStr(8,2, "1");
  
  u8g2.drawFrame(23,0,17,17);   
  u8g2.drawStr(29,2, "2");
  
  u8g2.drawFrame(44,0,17,17);   
  u8g2.drawStr(50,2, "3");
  
  u8g2.drawFrame(65,0,17,17);
  u8g2.drawStr(71,2, "4");

  u8g2.drawBox(86,0,17,17);   //Selected box
  u8g2.drawStr(92,2, "5");    //Selected string

  u8g2.drawFrame(107,0,17,17);
  u8g2.drawStr(113,2, "6");

  u8g2.drawFrame(115,51,12,10);
  u8g2.drawXBMP(117, 53, 8, 6, back);
  
  u8g2.sendBuffer();
}

#define pinkyMin 13
#define pinkyMax 161
uint8_t pinky_angle=13;
uint8_t pinky_percentage=0;

void C1_pinky_in(void){
  jky_servo_movement();
  btn_Jky(4);
  if(movement==1 && pinky_angle<pinkyMax){
      pinky_angle++;
  }
  else if(movement==2 && pinky_angle>pinkyMin){
      pinky_angle--;
  }
  setServo(4,pinky_angle);
  pinky_percentage=map(pinky_angle, pinkyMin, pinkyMax, 0, 100);
  String percentage = String(pinky_percentage);
  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(16, 0, "Adjust Position");

  u8g2.drawStr(12,24, "Pinky:");
  u8g2.drawStr(64,24, percentage.c_str());   //map variable for %
  u8g2.drawStr(82,24, "%");
    
  u8g2.drawFrame(12,40,102,17);
  u8g2.drawBox(13,41,middle_percentage,15);   //x is percentage of map
    
  u8g2.sendBuffer();
}
void C1_wrist(void){  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(49, 32, "WRIST");
  
  u8g2.drawFrame(2,0,17,17);   
  u8g2.drawStr(8,2, "1");
  
  u8g2.drawFrame(23,0,17,17);   
  u8g2.drawStr(29,2, "2");
  
  u8g2.drawFrame(44,0,17,17);   
  u8g2.drawStr(50,2, "3");
  
  u8g2.drawFrame(65,0,17,17);
  u8g2.drawStr(71,2, "4");

  u8g2.drawFrame(86,0,17,17);
  u8g2.drawStr(92,2, "5");

  u8g2.drawBox(107,0,17,17);    //Selected box
  u8g2.drawStr(113,2, "6");     //Selected string

  u8g2.drawFrame(115,51,12,10);
  u8g2.drawXBMP(117, 53, 8, 6, back);
  
  u8g2.sendBuffer();
}

#define wristMin 180
#define wristMax 150
uint8_t wrist_angle=180;
uint8_t wrist_percentage=0;

void C1_wrist_in(void){
  jky_servo_movement();
  btn_Jky(4);
  if(movement==1 && wrist_angle>wristMax){
      wrist_angle--;
  }
  else if(movement==2 && wrist_angle<wristMin){
      wrist_angle++;
  }
  setServo(5,wrist_angle);
  wrist_percentage=map(wrist_angle, wristMin, wristMax, 0, 100);
  String percentage = String(wrist_percentage);
  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(16, 0, "Adjust Position");

  u8g2.drawStr(12,24, "Wrist:");
  u8g2.drawStr(64,24, percentage.c_str());   //map variable for %
  u8g2.drawStr(82,24, "%");
    
  u8g2.drawFrame(12,40,102,17);
  u8g2.drawBox(13,41,wrist_percentage,15);   //x is percentage of map
    
  u8g2.sendBuffer();
}
void C1_goBack(void){  
  u8g2.clearBuffer();
  u8g2.setDrawColor(2);
  
  u8g2.drawStr(43, 32, "GO BACK");
  
  u8g2.drawFrame(2,0,17,17);   
  u8g2.drawStr(8,2, "1");
  
  u8g2.drawFrame(23,0,17,17);   
  u8g2.drawStr(29,2, "2");
  
  u8g2.drawFrame(44,0,17,17);   
  u8g2.drawStr(50,2, "3");
  
  u8g2.drawFrame(65,0,17,17);
  u8g2.drawStr(71,2, "4");

  u8g2.drawFrame(86,0,17,17);
  u8g2.drawStr(92,2, "5");

  u8g2.drawFrame(107,0,17,17);
  u8g2.drawStr(113,2, "6");
  
  u8g2.drawBox(115,51,12,10);   //Selected box
  
  u8g2.setDrawColor(0);
  u8g2.drawXBMP(117, 53, 8, 6, back);
  u8g2.sendBuffer();
}

//MAIN CUSTOM METHOD
void custom_C1(void){
  switch(C1){
    case thumb:
      if(swbtn_state==5){
        jky_servo_movement();
        C1_thumb_in();
      }
      else{
        btn_Jky(5);
        jkyC1();
        C1_thumb();  //print on display F1_rock
      }
      break;
    
    case index:
      if(swbtn_state==5){ //s'ha de canviar!!
        C1_index_in();
      }
      else{
        btn_Jky(5);
        jkyC1();
        C1_index();  //print on display F1_rock
      }
      break;
    
    case middle:
      if(swbtn_state==5){ //s'ha de canviar!!
        C1_middle_in();
      }
      else{
        btn_Jky(5);
        jkyC1();
        C1_middle();  //print on display F1_rock
      }
      break;

    case ring:
      if(swbtn_state==5){ //s'ha de canviar!!
        C1_ring_in();
      }
      else{
        btn_Jky(5);
        jkyC1();
        C1_ring();  //print on display F1_rock
      }
      break;
    
    case pinky:
      if(swbtn_state==5){ //s'ha de canviar!!
        C1_pinky_in();
      }
      else{
        btn_Jky(5);
        jkyC1();
        C1_pinky();  //print on display F1_rock
      }
      break;

    case wrist:
      if(swbtn_state==5){ //s'ha de canviar!!
        C1_wrist_in();
      }
      else{
        btn_Jky(5);
        jkyC1();
        C1_wrist();  //print on display F1_rock
      }
      break;

    case goBackC1:
        btn_Jky(0);
        jkyC1();
        C1_goBack();  //print on display F1_rock
      break;
  }
}

void setup(){
  u8g2.begin();
  u8g2_prepare();
  servo.begin();
  servo.setPWMFreq(Freq);
  pinMode(jky, INPUT_PULLUP);
  F1=rock;
  C1=thumb;
  M1=openClose;
  swbtn_state=0;
}

void loop(){ 
  modes_M1();
}

#include<iostream>
using namespace std;

int sum(int arr[], int a);

int main() {
    int arr[1000], n;
    cin >> n;
    for (int i = 0; i < n; ++i) {
        cin >> arr[i];
        cout << sum(arr, n);
    }
}
int sum(int arr[], int a) {
    int i;
    sum = 0;
    for (i=0; i<n; ++i) {
        sum += arr[i];
    }
    return sum;
}#include<iostream>
using namespace std;

int sum(int arr[], int a);

int main() {
    int arr[1000], n;
    cin >> n;
    for (int i = 0; i < n; ++i) {
        cin >> arr[i];
        cout << sum(arr, n);
    }
}
int sum(int arr[], int a) {
    int i;
    sum = 0;
    for (i=0; i<n; ++i) {
        sum += arr[i];
    }
    return sum;
}

(Display calendars) Write a program that prompts the user to enter the year and first day of the year and displays the calendar table for the year on the console. For example, if the user entered the year 2013 and 2 for Tuesday, January 1, 2013, your program should display the calendar for each month in the year, as follows:

#include <iostream>
#include<cmath>
#include<ctime>
#include<string>
#include <iomanip>
#include <fstream>

using namespace std;

int main()
{
	cout << "enter the year ";
	int year;
	cin >> year;
	
	cout << "Enter The First Day Of The year ";
	int FirstDay;
	cin >> FirstDay;
	int count = 1;
	int days = 1;
	for (int month = 1; month <= 12; month++)
	{
		cout << "             ";
		switch (month)
		{
		case 1: cout << "January " << year<<endl;
			break;
		case 2: cout << "February " << year << endl;
			break;
		case 3: cout << "March  " << year << endl;
			break;
		case 4: cout << "April  " << year << endl;
			break;
		case 5: cout << "May " << year << endl;
			break;
		case 6: cout << "June  " << year << endl;
			break;
		case 7: cout << "July  " << year << endl;
			break;
		case 8: cout << "August " << year << endl;
			break;
		case 9: cout << "September " << year << endl;
			break;
		case 10: cout << "October " << year << endl;
			break;
		case 11: cout << "November " << year << endl;
			break;
		case 12: cout << "December " << year << endl;
			break;
		}
		cout << " --------------------------------------------------------- "<<endl;
		cout << "  Sun Mon Tue Wed Thu Fri Sat"<<endl;
		for (int i = 0; i < FirstDay; i++)
		{
			cout << "    ";
		}
		for (int i = 1; i < 31; i++)
		{
			if (i < 10) {
				cout<<"   " <<i;
			}
			else {
				cout<<"  " << i;
			}
			if ((i + FirstDay) % 7 == 0) {
				cout << endl;
			}
		}
		cout << endl;

		FirstDay = (FirstDay + 31) % 7;
		
	}
	
	
}

(Display the Sundays in a month) Write a program that prompts the user to enter the month and first day of the month, and displays all the Sundays in that month. For example, if the user entered the month 7 for July, and the first day 4 for Wednesday, your program should display the following output: The first day of this month is Wednesday! ... Next Sunday of this month is on 26

#include <iostream>
#include<cmath>
#include<ctime>
#include<string>
#include <iomanip>
#include <fstream>

using namespace std;

int main()
{
	cout << "enter the month ";
	int month;
	cin >> month;
	cout << "Enter The First Day Of The Month ";
	int firstDay;
	cin >> firstDay;
	int nextSunday = 1;
	
		switch (firstDay)
		{
			
		case 1: nextSunday += 7;
			cout << "The first day of this month is sunday "<<endl;
			while (nextSunday < 30)
			{
					cout << "Next Sunday of this month is on " << nextSunday << endl;
									nextSunday += 7 ;
			}
			break;

		case 2: nextSunday += 6;
			cout << "The first day of this month is monday " << endl;
			while (nextSunday < 30)
			{
				cout << "Next Sunday of this month is on " << nextSunday << endl;
				nextSunday += 7;
			}
			break;
		case 3: nextSunday += 5;
			cout << "The first day of this month is tuesday " << endl;
			while (nextSunday < 30)
			{
				cout << "Next Sunday of this month is on " << nextSunday << endl;
				nextSunday += 7;
			}
			break;
		case 4: nextSunday += 4;
			cout << "The first day of this month is wednesday " << endl;
			while (nextSunday < 30)
			{
				cout << "Next Sunday of this month is on " << nextSunday << endl;
				nextSunday += 7;
			}
			break;
		case 5: nextSunday += 3;
			cout << "The first dayof this month is thursday " << endl;
			while (nextSunday < 30)
			{
				cout << "Next Sunday of this month is on " << nextSunday << endl;
				nextSunday += 7;
			}
			break;
		case 6: nextSunday += 2;
			cout << "The first day of this month is friday " << endl;
			while (nextSunday < 30)
			{
				cout << "Next Sunday of this month is on " << nextSunday << endl;
				nextSunday += 7;
			}
			break;
		case 7: nextSunday += 1;
			cout << "The first day of this month is saturday " << endl;
			while (nextSunday < 30)
			{
				cout << "Next Sunday of this month is on " << nextSunday << endl;
				nextSunday += 7;
			}
			break;

		}
		
}

#c++ #algorithms #interviewquestions #arrays

Kadane’s Algorithm

int maxSubArraySum(int a[], int size) 
{ 
int max_so_far = 0, max_ending_here = 0; 
for (int i = 0; i < size; i++) 
{ 
	max_ending_here = max_ending_here + a[i]; 
	if (max_ending_here < 0) 
		max_ending_here = 0; 

	/* Do not compare for all elements. Compare only 
		when max_ending_here > 0 */
	else if (max_so_far < max_ending_here) 
		max_so_far = max_ending_here; 
} 
return max_so_far; 
}

Кожаный мешок

#include <iostream>

int main () {
  int number;
  int lastNumber;
  std :: cout << "Введите число: ";
  std :: cin >> number;

  while (number != 0) {
    lastNumber = number % 10;
    if (lastNumber != 1 && lastNumber != 0) break;
    number /= 10;
  }

  if (lastNumber == 1 || lastNumber == 0) {
    std :: cout << "Робот все понял!\n";
  } else {
    std :: cout << "Машинный код состоит не только из 0 и 1. Ошибка!\n";
  }
}

Банкомат 4.0.

#include <iostream>

int main() {
  int pin;
  std::cout<<"Введите число-пинкод\n";
  std::cin >> pin;
  int sum;
  while(pin !=42 ){
    std::cout << "Error try again:";
    std::cin >> pin;
    }
  if (sum==42){
  std::cout<<"пинкод верный работаем дальше";
    }
  }

Кадастровые проблемы

#include <iostream>

using namespace std;

int main() {

int square;
  
  cout << "Введите площадь:\n";
  cin >> square;

  if (square > 1000000) cout << "Нет такого участка";
  else {

    int iteration = 0;
  
      while (iteration * iteration < square) {
      ++iteration;
      }

      if (iteration * iteration == square) cout << "Является точным квадратом";
        else cout << "Не является точным квадратом";
}


}

#c++ #oop #date

DATE operations using OOP

#include<iostream>
using namespace std;
class DATE{
    int day;
    int month;
    int year;
    public:
    DATE(){}
    DATE(char*);
    int operator-(DATE);
    DATE operator+(int);
    bool operator<(DATE);
    friend ostream& operator<<(ostream &,DATE&);
    ~DATE();
};
int main(){

    cout<<"Enter the first date in dd/mm/yyyy format: ";
    char input[20];
    cin>>input;
    DATE d1(input);
    cout<<d1<<endl;
    cout<<"Enter the second date in dd/mm/yyyy format: ";
    cin>>input;
    DATE d2(input);
    cout<<d2<<endl;
    int num_days = d2-d1;
    
    cout<<"Number of days in between is: "<<num_days<<endl;
    cout<<"Enter the number of days\n";
    int num;
    cin>>num;
    DATE d3 = d1 + num;
    cout<<d1<<" + "<<num<<" = "<<d3;
    return 0;
}
int my_stoi(char *input,int start,int len){
    int output =0;
    for(int i=start;i<start+len;i++){
        output = output*10 + input[i]-'0';
    }
    return output;
}
DATE::DATE(char *input){
    day = my_stoi(input,0,2);
    month = my_stoi(input,3,2);
    year = my_stoi(input,6,4);
}
inline bool is_leap_year(int yy){
    if(yy%400==0) return 0;
    return yy%4 ? 0: 1;
}
inline int days_in_year(int yy){
    return is_leap_year(yy) ? 366 : 365;
}
int days_in_month(int mo,int yy){
    switch(mo){
        case 1:case 3:case 5: case 7: case 8: case 10: case 12:
            return 31;
        case 4: case 6: case 9: case 11:
            return 30;
        case 2: 
            if(is_leap_year(yy)) return 29;
            else return 28;
    }
    return -1;
}
bool DATE::operator<(DATE d2){
    if(year<d2.year) return true;
    else if(year>d2.year) return false;
    if(month<d2.month) return true;
    else if(month>d2.month) return false;
    return day<d2.day;
}
int DATE::operator-(DATE d2){
    if(*this<d2) return d2-*this;

    int prefix_days_d1 =0;
    for(int i=1;i<month;i++) prefix_days_d1 += days_in_month(i,year);
    prefix_days_d1 += day;

    int suffix_days_d2=0;
    suffix_days_d2 += days_in_month(d2.month,d2.year)-d2.day;
    for(int i = d2.month+1;i<=12;i++) suffix_days_d2 += days_in_month(i,d2.year);

    int difference = suffix_days_d2 + prefix_days_d1;

    for(int i = d2.year+1 ; i<year ; i++){
        difference += days_in_year(i);
    }
    if(year==d2.year) difference -= days_in_year(year);   // overlap
    return difference;
}
ostream& operator<<(ostream &print,DATE &obj){
    if(obj.day/10 ==0) print<<"0";
    print<<obj.day;
    print<<"/";
    if(obj.month/10 ==0) print<<"0";
    print<<obj.month<<"/";
    print<<obj.year;
    return print;
}
DATE DATE::operator+(int add_days){
    DATE output;
    int dd = day;
    int mm = month;
    int yy = year;
    int current_days = days_in_month(mm,yy) - dd;
    if(add_days > current_days){  
                                    // rounding up the month
        add_days-=current_days;
        mm++;
        if(mm==13) {
            mm=1;
            yy++;
        }
    }
    else{
        dd +=add_days;
        add_days=0;
    }
    while(days_in_month(mm,yy)<add_days){
                                        // rounding up the year
        add_days-=days_in_month(mm,yy);
        mm++;
        if(mm==13) {
            mm=1;
            yy++;
            break;
        }
    }
    while(days_in_year(yy)<add_days){   //locating to the year
        add_days-=days_in_year(yy);
        yy++;
    }
    while(days_in_month(mm,yy)<add_days){ // locating to the month
        add_days-=days_in_month(mm,yy);
        mm++;
    }
    if(add_days!=0) dd = add_days;  // locating to the date
    output.day = dd;
    output.month = mm;
    output.year = yy;

    return output;
}
DATE::~DATE(){
    
}

#c++ #list #oop

List operations using OOP

#include<iostream>
using namespace std;

typedef struct NODE{
    int data;
    NODE *next;
}NODE;
class LIST{
    NODE *head;
    public:
    LIST();
    LIST& operator+(int);
    LIST& operator-(int);
    bool operator==(LIST&);
    LIST& operator++(int);
    LIST& operator--(int);
    friend ostream& operator<<(ostream&,LIST&);
    ~LIST();
};
int main(){
    LIST l;
    int choice,ele;
    while(1){
        cout<<"1. L = L + ele\n";
        cout<<"2. L = L - ele\n";
        cout<<"3. L = L++ \n";
        cout<<"4. L = L--\n";
        cout<<"-1: Exit\n";
        cin>>choice;
        switch(choice){
            case 1: 
                    cout<<"Enter the value of the element\n";
                    cin>>ele;
                    l = l + ele;
            break;
            case 2:
                    cout<<"Enter the value of the element\n";
                    cin>>ele;
                    l = l - ele;
            break;
            case 3:
                    l = l++;
            break;
            case 4: 
                    l = l--;
            break;
            case -1:
                    goto out;
            default:
                    cout<<"Invalid entry\n";
        }
        cout<<"List: "<<l;
    }
    out:
    return 0;
}

LIST::LIST(){
    head=NULL;
}
bool ispresent(NODE* chain,NODE *end,int key){
    NODE *temp = chain;
    while(temp!=end){
        if(temp->data==key) return true;
        temp = temp->next;
    }
    if(end!=NULL) return end->data == key ? 1:0;
    return false;
}
LIST& LIST::operator--(int){
    NODE *distinct_head = NULL;
    NODE *distinct_connect = NULL;
    NODE *duplicate_head=NULL;
    NODE *duplicate_connect = NULL;
    NODE *temp = head;
    while(temp){
        if(ispresent(distinct_head,distinct_connect,temp->data)){
            if(!duplicate_connect) duplicate_head = temp;
            else duplicate_connect->next = temp;
            duplicate_connect = temp;
        }
        else{
            if(!distinct_connect) distinct_head = temp;
            else distinct_connect->next = temp;
            distinct_connect = temp;
        }
        NODE *store = temp->next;
        temp->next = NULL;
        temp = store;
    }
    distinct_connect->next  = duplicate_head;
    head = distinct_head;
    return *this;
}
LIST& LIST::operator++(int){
    NODE *temp = head;
    while(temp){
        temp->data = temp->data +1;
        temp=temp->next;
    }
    return *this;
}
bool LIST::operator==(LIST &l2){
    NODE *temp1 = head;
    NODE *temp2 = l2.head;
    if(temp1 == NULL && temp2 == NULL) return true;
    if(temp1==NULL || temp2==NULL) return false;
    while(temp1 && temp2){
        if(temp1->data!=temp2->data) return false;
        temp1 = temp1->next;
        temp2 = temp2->next;
    }
    return temp1 || temp2 ? 0:1;
}
LIST& LIST::operator-(int element){
    NODE *temp = head;
    NODE *prev= NULL;
    while(temp){
        if(temp->data==element){
            if(!prev) head=head->next;
            else prev->next = temp->next;
            delete temp;
            return *this;
        }
        prev=temp;
        temp=temp->next;
    }
    return *this;
}
LIST& LIST::operator+(int element){
    NODE *current = new NODE;
    current->data = element;
    current->next = NULL;
    NODE *temp = head;
    if(!temp){
        head = current;
        return *this;
    }
    while(temp->next){
        temp = temp->next;
    }
    temp->next = current;
    return *this;
}
ostream& operator<<(ostream& print,LIST &l){
    NODE *temp= l.head;
    while(temp){
        print<<temp->data<<" ";
        temp = temp->next;
    }
    print<<endl;
    return print;
}
LIST::~LIST(){
    NODE *temp = head;
    while(temp){
        NODE *store = temp->next;
        delete temp;
        temp = store;
    }
}

Matrix Operations Using OOP

#include<iostream>
using namespace std;

class MATRIX{
    int row;
    int col;
    int **array;
    public:
    MATRIX();
    MATRIX(const MATRIX&);
    MATRIX(int,int);
    void takeinput();
    MATRIX operator+(MATRIX);
    MATRIX operator-(MATRIX);
    bool operator==(MATRIX);
    friend ostream& operator<<(ostream&,MATRIX);
    ~MATRIX();
};
int main(){

    int r,c;
    cout<<"Enter number of rows for matrix m1: ";
    cin>>r;
    cout<<"Enter number of columns for matrix m1: ";
    cin>>c;
    MATRIX m1(r,c);
    m1.takeinput();
    cout<<"Enter number of rows for matrix m2: ";
    cin>>r;
    cout<<"Enter number of columns for matrix m2: ";
    cin>>c;
    MATRIX m2(r,c);
    m2.takeinput();
    cout<<"Matrix m1 :-"<<endl<<m1;
    cout<<"Matrix m2 :-"<<endl<<m2;
    MATRIX m3,m4;
    if(m1==m2){
        MATRIX m3 = m1 + m2;
        cout<<"Matrix m3 :-"<<endl;
        cout<<m3;
        MATRIX m4 = m1 - m2;
        cout<<"Matrix m4 :-"<<endl;
        cout<<m4;
    }
    else{
        cout<<"Error! The dimensions of both the operand matrices are not same\n";
    }
    return 0;
}

MATRIX::MATRIX(int r,int c){
    row = r;
    col = c;
    array = new int*[r];
    for(int i=0;i<r;i++){
        array[i] = new int[c];
        for(int j=0;j<c;j++) {
            array[i][j] = 0;
        }
    }
}
MATRIX::MATRIX(const MATRIX& obj){
    row = obj.row;
    col = obj.col;
    array = new int*[row];
    for(int i=0;i<row;i++){
        array[i] = new int[col];
        for(int j=0;j<col;j++){
            array[i][j] = obj.array[i][j];
        }
    }
}
void MATRIX::takeinput(){
    for(int i=1;i<=row;i++){
        for(int j=1;j<=col;j++){
            cout<<"Enter ("<<i<<", "<<j<<") element: ";
            cin>>array[i-1][j-1];
        }
    }
}
MATRIX::MATRIX(){
    row=0;
    col=0;
    array=NULL;
}
MATRIX MATRIX::operator+(MATRIX m2){
    MATRIX output(row,col);
    for(int i=0;i<row;i++){
        for(int j=0;j<col;j++){
            output.array[i][j] = array[i][j] + m2.array[i][j];
        }
    }
    return output;
}
MATRIX MATRIX::operator-(MATRIX m2){
    MATRIX output(row,col);
    for(int i=0;i<row;i++){
        for(int j=0;j<col;j++){
            output.array[i][j] = array[i][j] - m2.array[i][j];
        }
    }
    return output;
}
ostream& operator<<(ostream &print, MATRIX m){
    for(int i=0;i<m.row;i++){
        for(int j=0;j<m.col;j++){
            print<<m.array[i][j]<<" ";
        }
        print<<endl;
    }
    return print;
}
bool MATRIX::operator==(MATRIX m2){
    return (row==m2.row && col==m2.col) ? true:false;
}

MATRIX::~MATRIX(){
    for(int i=0;i<row;i++){
        delete []array[i];
    }
    delete []array;
}

Меню ресторана.

#include <iostream>

using std::cout;
using std::cin;
using std::endl;

int main() 
{
int DayoftheWeek;

cout << "Введите День недели: ";
cin >> DayoftheWeek;
  
if(DayoftheWeek == 1)
	{
		cout << "***Понедельник***" << endl;
    cout << "Борщ" << endl;
    cout << "Салат с помидорами и огурцами" << endl;
    cout << "Чай" << endl;
	}
else if(DayoftheWeek == 2)
	{
		cout << "***Вторник***" << endl;
    cout << "Суп Щи" << endl;
    cout << "Пюрешка с котлетками" << endl;
    cout << "Компот с клюквой" << endl;
	}
else if(DayoftheWeek == 3)
	{
	  cout << "***Среда***" << endl;
    cout << "Суп Сырный" << endl;
    cout << "Гречневая каша" << endl;
    cout << "Сок яблочный" << endl;
	}
else if (DayoftheWeek == 4)
	{
		cout << "***Четверг***" << endl;
    cout << "ПЕЛЬМЕНИ" << endl;
    cout << "Салат Греческий" << endl;
    cout << "Компот вишнёвый" << endl;
	}
else if(DayoftheWeek == 5)
	{
		cout << "***Пятниц***" << endl;
    cout << "Сборня солянка" << endl;
    cout << "Макароны с тушёнкой" << endl;
    cout << "Чай" << endl;
	}
else if(DayoftheWeek == 6)
	{
	  cout << "***Суббота***" << endl;
    cout << "Суп Сырный" << endl;
    cout << "Компот с клюквой" << endl;
    cout << "Макароны с котлетами" << endl;
	}
else if (DayoftheWeek == 7)
	{
		cout << "***Восресенье***" << endl;
    cout << "ПЕЛЬМЕНИ" << endl;
    cout << "Салат с помидорами и огурцами" << endl;
    cout << "Чай" << endl;
  }
}

Кратность числа.

#include <iostream>

using std::cout;
using std::cin;
using std::endl;

int main()
{

int a;
int b;

cout << "Введите целое число: ";
cin >> a;
 
cout << "Введите второе целое число: ";
cin >> b;
 
cout << "Остаток: " << a % b << endl;
 
if ((a % b) == 0)
	cout << a << " Делится на " << b << endl;
else
	cout << a << " Не делится на " << b << endl;
}

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