A program to check whether the number is prime or not?

What is prime Number?
A prime number is a positive integer which is divisible only by 1 and itself only.

Examples of Prime Numbers:

 2, 3, 5, 7, 11, 13 etc.

The following program tells you how to check whether the number is prime or not?

Solution :C


// A C program to check whether the number is prime or not
// Important question to prepare for Vyomlabs Interview Preparation
#include <stdio.h>
void prime(int n);
int main()
{
    int n;

    printf("Enter a positive integer: ");
    scanf("%d",&n);

    prime(n);
    return 0;
}

void prime (int n) {
int i, flag = 0;

for(i=2; i<=n/2; ++i)
    {
        // condition for nonprime number
        if(n%i==0)
        {
            flag=1;
            break;
        }
    }

    if (flag==0)
        printf("%d is a prime number.",n);
    else
        printf("%d is not a prime number.",n);
   
}