Write a C program to check if a number is perfect (number = sum of its factors)

Perfect number is a positive number which sum of all positive divisors excluding that number is equal to that number. For example 6 is perfect number since divisor of 6 are 1, 2 and 3.  Sum of its divisor is 1 + 2+ 3 = 6

#include <stdio.h>

void  main()

{

    int n,i,sum;

    int mn,mx;

    printf("Input the  number : ");

    scanf("%d",&n);

    sum = 0;

    printf("The positive divisor  : ");

    for (i=1;i<n;i++)

    {

        if(n%i==0)

        {

            sum=sum+i;

            printf("%d  ",i);

        }

    }

    printf("\nThe sum of the divisor is : %d",sum);

    if(sum==n)

        printf("\nSo, the number is perfect.");

    else

        printf("\nSo, the number is not perfect.");

}

OUTPUT:

Input the  number : 28

The positive divisor  : 1  2  4  7  14

The sum of the divisor is : 28

So, the number is perfect.