C语言-求完美数

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int i, j, k;
    int upper;
   
    printf("请确定上限:");
    scanf("%d", &upper);
   
    for( i = 2; i <= upper; i++ )
    {
        int sum = 0;
        
        for( j = 1; j < i; j++ )
        {
            if( i % j == 0 )
            { sum += j;}
        }
        
        if( sum == i )
        {
            printf("%d的完美数是:", i);
               
            for( k = 1; k < i; k++ )
            {
                    if( i % k == 0 )
                {
                    printf("%d ", k);
                }
            }
            printf("\n");
        }
    }
    system("pause");
    return 0;
}