Prime Number Checker in C

A program that I wrote using C language that will ask the user to give a number and then our program will determine if the given number in a prime number or not.  The code is very simple and easy to use.

I am currently accepting programming work kindly contact me in the following email address for further details. Thank you.

My email address are the following jakerpomperada@gmail.com and jakerpomperada@yahoo.com.

My mobile number here in the Philippines is 09173084360.

My telephone number at home here in Bacolod City, Negros Occidental is (034) 4335675.

Sample Program Output

Program Listing

prime.c

#include <stdio.h>

int main()

{

    int num=0, a=0, flag = 0;

    printf("Prime Number Checker in C");

    printf("\n\n");

    printf("Give a Number :  ");

    scanf("%d",&num);

    for(a=2; a<=num/2; a++)

    {

        if(num%a==0)

        {

            flag=1;

            break;

        }

    }

    if (flag==0) {

        printf("\n\n");

        printf("The number %d is a prime number.",num);

        printf("\n\n");

        printf("End of Program");

        printf("\n\n");

    }

    else {

        printf("\n\n");

        printf("The number %d is not a prime number.",num);

        printf("\n\n");

        printf("End of Program");

        printf("\n\n");

    }

    return 0;

}