1 /*
 2     题目：完全数
 3     author taoliu——alex  2016.10
 4 
 5 */
 6 
 7 
 8 #include <stdio.h>
 9 
10 
11 void perfectnum(int n)
12 {
13 
14     int perfect[100]={0};
15     int sum=0;
16     for (int i = 1; i < n; i++)
17     {
18         if (n%i==0)
19         {
20             perfect[i]=i;
21             sum=sum+i;
22         }
23     }
24     if (sum==n)
25     {
26         printf("the number %d is perfect number!\n",n);
27         printf("the number %d is made up as follow!\n",n);
28         for (int i = 0; i < 100; i++)
29         {
30             if (perfect[i]!=0)
31             {
32                 printf("%d ", perfect[i]);
33             }
34         }
35 
36     }
37     //else
38     //    printf("%d is not perfect number!\n",n );
39 
40 
41 }
42 
43 int main()
44 {
45 
46 
47     //可以输入你想要判断的数字
48     /*
49     int n;
50     printf("please input the number you want to judge! \n");
51     scanf("%d",&n);
52     perfectnum(n);
53     */
54     //也可以输出在某一范围内的所有完全数
55     printf("please input the scope you want to find! \n");
56     int scope;
57     scanf("%d",&scope);
58 
59     for (int i = 1; i < scope; ++i)
60     {
61         perfectnum(i);
62     }
63     return 0;
64 
65 }