C-Program to know whether the given number is perfect number or not

#include<stdio.h>

#include<math.h>

int main()

{

  int num,i,sum=0;

  printf("Enter a number to know whether it is perfect or not\n");

  scanf("%d",&num);

  for(i=1;i<num;i++)

  {

       if(num%i==0)

       {

         sum+=i;

       }

  }

       if(sum==num)

      {

         printf("The given number %d is perfect\n",num);

      }

      else

     {

       printf("The given number %d is not perfect because the sum of its divisors are %d\n",num,sum);

      }

return 0;

}