1 // Test1016-因子之和.cpp: 定义控制台应用程序的入口点。 2 // 3 #include "stdafx.h" 4  5 int factor[100] = {}; 6 int index = 0; 7 int isPerfect(int num) 8 { 9     int equal = 0;10     index = 0;11     for (int i = 1; i <= num / 2+1; i++)12     {13         if (num % i == 0)14         {15             equal += i;16             factor[index++] = i;17         }18     }19     if (equal == num)20         return 1;21     else22         return 0;23 }24 int main()25 {26     int num;27     scanf_s("%d", &num);28 29     for (int i = 2; i <= num; i++)30     {31         if (isPerfect(i) == 1)32         {33             printf("%d its factors are ", i);34             for (int j = 0; j < index; j++)35                 printf("%d ", factor[j]);36             printf("\n");37             index = 0;38         }39     }40     return 0;41 }

结果

1 100002 6 its factors are 1 2 33 28 its factors are 1 2 4 7 144 496 its factors are 1 2 4 8 16 31 62 124 2485 8128 its factors are 1 2 4 8 16 32 64 127 254 508 1016 2032 40646 请按任意键继续. . .