C Program check whether number is perfect number or not

 C Program check whether number is perfect number or not

#include<stdio.h>

#include<math.h>

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);

  }

}

Output:-

Enter a number to know whether it is perfect or not

8

The given number 8 is not perfect because the sum of its divisors are 7