checking wheather the number is perfect or not.c

#include <stdio.h>

 int main()
{
    int num,loop;
    int sum;
    printf("Enter an integer number: ");
    scanf("%d",&num);
    sum=0;
    for(loop=1; loop<num;loop++)
    {
        if(num%loop==0)
        sum=sum+loop;
    }
     if(sum==num)
    printf("%d is a perfect number.",num);
    else
    printf("%d is not a perfect number.",num);
 
    return 0;
}