In this C++ program, we will take an input from the user and check whether the number is prime or not.

 

  1. #include <iostream>  
  2. using namespace std;  
  3. int main()  
  4. {  
  5.   int n, i, m=0, flag=0;  
  6.   cout << "Enter the Number to check Prime: ";  
  7.   cin >> n;  
  8.   m=n/2;  
  9.   for(i = 2; i <= m; i++)  
  10.   {  
  11.       if(n % i == 0)  
  12.       {  
  13.           cout<<"Number is not Prime."<<endl;  
  14.           flag=1;  
  15.           break;  
  16.       }  
  17.   }  
  18.   if (flag==0)  
  19.       cout << "Number is Prime."<<endl;  
  20.   return 0;  

Program to find average of N Numbers

#include<stdio.h>

int main()
{
    printf("\n\n\t\tStudytonight - Best place to learn\n\n\n");

    int n, i;
    float sum = 0, x;

    printf("Enter number of elements:  ");
    scanf("%d", &n);
    printf("\n\n\nEnter %d elements\n\n", n);
    for(i = 0; i < n; i++)
    {
        scanf("%f", &x);
        sum += x;
    }
    printf("\n\n\nAverage of the entered numbers is =  %f", (sum/n));
    printf("\n\n\n\n\t\t\tCoding is Fun !\n\n\n");
    return 0;
}

Program to find Armstrong Number between 1 to 500

#include<stdio.h>
#include<math.h>

int main()
{
    printf("\n\n\t\tStudytonight - Best place to learn\n\n\n");
    int n,sum,i,t,a;
    printf("\n\n\nThe Armstrong numbers in between 1 to 500 are : \n\n\n");

    for(i = 1; i <= 500; i++)
    {
        t = i;  // as we need to retain the original number
        sum = 0;
        while(t != 0)
        {
            a = t%10;
            sum += a*a*a;
            t = t/10;
        }

        if(sum == i)
        printf("\n\t\t\t%d", i);
    }

    printf("\n\n\n\n\t\t\tCoding is Fun !\n\n\n");
    return 0;
}

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