C language classic exercises to write a program to find all the perfects within 1000.

Write a program , find 1000 All of the completions within , The so-called perfect number is a number exactly equal to the sum of its factors ,
for example 6=1+2+3,6 It's a perfect number .

// Write a program , find 1000 All of the completions within , The so-called perfect number is a number exactly equal to the sum of its factors ,
// for example 6=1+2+3,6 It's a perfect number .
#include <stdio.h>
int main(int argc, char const *argv[])
{
    
    int a, b, sum;
    for (a = 2; a < 1000; a++)
    {
    
        sum = 0;
        for (b = 1; b < a; b++)
        {
    
            if (a % b == 0)
            {
    
                sum += b;
            }
        }
        if (sum == a)
            printf("%d ", a);
    }
    return 0;
}

The operation result is as shown in the figure ：