(Math: approximate the square root)

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Tue Nov 10 2020 22:42:18 GMT+0000 (UTC)

Saved by @mahmoud hussein #c++

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

using namespace std;



double sqrt(int n);


int main()
{
	
	long n;
	cin >> n;
	cout << "the approximated sqrt of the number " << n << " is " << sqrt(n);
}
double sqrt(long n)
{
	double lastGuess = 1;
	double nextGuess = (lastGuess + n / lastGuess) / 2;

	while (nextGuess - lastGuess > 0.0001)
	{
		nextGuess = lastGuess;
		(lastGuess + (n / lastGuess)) / 2;
	}
	lastGuess = nextGuess;
	return nextGuess = (lastGuess + n / lastGuess) / 2;

}

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@mahmoud hussein

: Converting Decimals to Hexadecimals,” gives a program that converts a decimal to a hexadecimal. How do you convert a hex number into a decimal? (Financial application: find the profit-per-item) Use the scheme in programming Exercise 5.39 to write a function that computes the profit-per-item. The header of the function is: double computeProfitPerItem(double quantity) Write a test program that displays the following table: find LCM check whether the reversed integer is also an Armstrong number (Even Palindrome number) Write a program that displays the first 100 emirps Write a program that finds the first 25 additive prime numbers and displays the output in the following format: (Math: approximate the square root) (Average of even places)Write a function that returns the average of the digits in the even places in an integer using the following header: double avgOfEvenPlaces(int n) (Current date and time) Invoking time(0) returns the elapse time in milliseconds since midnight January 1, 1970. Write a program that displays the date and time. Here is a sample run: Write a test program that prompts the user to enter a number and its width and displays a string returned by invoking format(number, width). octal to decimal binary to octal Write the following function to check whether string s1 is a substring of string s2.

#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;
}

#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; 
}

#include <iostream>

using namespace std;

int main()
{
    int n;
    cin>>n;
    
    int arr[n];
    for(int i=0;i<n;i++){
        cin>>arr[i];
    }
    
    for(int i=0;i<n-1;i++)
    {
        for(int j=i+1;j<n;j++)
        {
            if(arr[j]<arr[i]){
                int temp=arr[j];
                arr[j]=arr[i];
                arr[i]=temp;
            }
        }
    }
    
    for(int i=0;i<n;i++)
    {
        cout<<arr[i]<<" ";
    }cout<<endl;
    
    return 0;
    
}

Convert char to int in C and C++ - Stack Overflow

char a = 'a';
int ia = (int)a; 
/* note that the int cast is not necessary -- int ia = a would suffice */

void insertionsort(int A[], int size){
  int i, j;
  for(i=1; i<size; i++){
    key= A[i];
    j=i-1;
    
    while(j>=0 && A[j]> key){
      A[j+1]= A[j];
      j=j-1;
    }
    A[j+1]= key;
  }
}

#include<bits/stdc++.c>

int binarysearch(int arr[], int l, int r, int x){
  if(r>=l){
     int mid= l+(r-1)/2;
     if(arr[mid]== x){
       return mid;
     }
    if(x<arr[mid]){
      return binarysearch(arr, l ,mid-1, x);
    }
    if(x>arr[mid]){
      return binarysearch(arr, mid+1, r, x);
    }
  }
  return -1;
  
}

int main(){
  int arr[]= {10, 20, 30, 40, 50};
  int x= 30;
  int n= sizeof(arr)/ sizeof(arr[0]);
  int result= binarysearch(arr, 0, 1, n-1m, x);
  (result==-1)? cout<<"Element is not present" : cout<<"Element is present at"<<result;
  return 0;
  
}

Even Or Odd CodeWars

#include <string>
using namespace std; 
std::string even_or_odd(int number) 
{
  string EvenOrOdd;
  if (number %2 == 0){
  EvenOrOdd = "Even"; 
  }else{
  EvenOrOdd = "Odd"; 
  }
  return EvenOrOdd;
}

Basic Data Types HackerRank

#include <iostream>
#include <cstdio>
using namespace std;

int main() {
    int d; 
    long ld; 
    char ch; 
    float f; 
    double lf; 
    
    
    scanf("%d %ld %c %f %lf",&d,&ld,&ch,&f,&lf);
    printf("%d\n%ld\n%c\n%f\n%lf",d,ld,ch,f,lf);
    return 0;
}

#include <stdio.h>

void update(int *a,int *b) {
     
    
    int ans = *a; 
    *a = *a + *b;
    *b = ans - *b; 
    if (*b <0){
        *b = -(*b);
    }
    
    //printf("*pb %d\n", *pb);
    //printf("*a %d\n",*a);
    //printf("*b %d\n",*b);
    //printf("*pa %d\n",*pa);
    //printf("\n"); 
    //    
}

int main() {
    int a, b;
    int *pa = &a, *pb = &b;
    
    scanf("%d %d", &a, &b);
    update(pa, pb);
    printf("%d\n%d", a, b);

    return 0;
}

Class Math Bugs??

// Online C++ compiler to run C++ program online
#include <iostream>
//#include <cstdio>
//#include <vector>
//#include <iostream>
//#include <algorithm>
#include <list> // for arra list list<foodIdeams>....
using namespace std;

class Maths {
public:
    int oneQty; 
    int twoQty;
    int sumTotal; 
    
    int width;
    int height; 
    int length;
    int areaTotal; 
    Maths(int Width, int Height, int Length, int OneQty, int TwoQty){
        width = Width; 
        height = Height; 
        length = Length;
        oneQty = OneQty; 
        twoQty = TwoQty; 
    }
    int MakeArea(int width, int height, int length) {
        areaTotal = width * height * length;
        return areaTotal;
    }
    void printArea() {
        cout << "Wigth: " << width << endl; 
        cout << "Height: " << height << endl; 
        cout << "length: " << length << endl; 
        cout << "" << endl;
        cout << "Total: "<< areaTotal << endl;
    }
    int subtraction(int oneQty, int twoQty) {
        sumTotal = oneQty - twoQty;
        return sumTotal; 
    }
    void printSum() {
        cout << "First Qty: " << oneQty << endl; 
        cout << "Second Qty: " << twoQty << endl; 
        cout << "" << endl; 
        cout << "Subtarction Totle: " << sumTotal << endl; 
    }

};

int main() {
    Maths One(4, 10, 13,3,4);
    One.MakeArea(3,1,1);
    One.subtraction(10, 7);
    One.printArea(); 
    
    One.printSum(); 
    
    return 0;
}

not using namespace exsample

#include <iostream>
//#include <cstdio>
//#include <vector>
//#include <iostream>
//#include <algorithm>
#include <list> // for arra list list<foodIdeams>....
//using namespace std;
//std:: not using namespace exsample 
namespace Happy {
    int num = 32; 
    std::string name = "Jarod";
    
}
namespace Sad {
    int num = 42; 
    std::string name = "Sid"; 
}
int main() {
    std::cout << Happy::name << std::endl;
    std::cout << Happy::num << std::endl; 
    std::cout << "" << std::endl; 
    std::cout << Sad::name << std::endl; 
    std::cout << Sad::num << std::endl;
    return 0;
}

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