Perfect number

 TO CHECK WHETHER THE NUMBER IS PERFECT NUMBER OR NOT.

#include<stdio.h>
int main()
{
    int i,n,sum=0;
    printf("enter numbers = ");
    scanf("%d",&n);
    for(i=1; i<=n/2; i++)
    {
        if(n%i==0)
            sum+=i;
    }
    if(n==sum)
    {
        printf("perfect number ");
    }
    else
    {
        printf("not a perfect number ");
    }
    return 0;
}

Output 

enter numbers = 28

perfect number