C Program to Check Whether a Number is Prime or Not

C Program to Check Whether a Number is Prime or Not

 # include <stdio.h>

int main()

{

    int n, i, flag = 0;

    printf("Enter a positive integer: ");

    scanf("%d",&n);

    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);

    return 0;

}

Output:

Enter a positive integer: 29

29 is a prime number.

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