Perfect Number C Language Program

Q: Write a program to check whether a number is prime or not?
(A number said to be perfect if sum of all factor less than given number then equal to given number)Input : 6

Solution : 

/*   ################################

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     Perfect Number

     for more visit : http://girfahelp.blogspot.in/p/c-language.html

     ################################

*/

#include<stdio.h>

void main()

{

    int n,m,s=0,d;

    printf("Enter first Number>> ");

    scanf("%d",&n);

    m=n;

    for(d=1;d<n;d++)

    {

           if(n%d==0)

                s=s+d;

    }

    if(s==n)

           printf("\n\tPerfect Number");

    else

           printf("\nNot a perfect number");

}

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