习题6-3 使用函数输出指定范围内的完数

Posted 2021-12-16 2018jason

 1 #include <stdio.h>
 2 
 3 int factorsum(int number);
 4 void PrintPN(int m, int n);
 5 
 6 int main()
 7 
 8     int i, m, n;
 9 
10     scanf_s("%d %d", &m, &n);
11     if (factorsum(m) == m) printf("%d is a perfect number\n", m);
12     if (factorsum(n) == n) printf("%d is a perfect number\n", n);
13     PrintPN(m, n);
14 
15     return 0;
16 
17 
18 /* 你的代码将被嵌在这里 */
19 int factorsum(int number)
20 
21     int sum = 0;
22     if (number == 1)
23     
24         return 1;
25     
26     for (int i = 1; i < number; i++)
27     
28         if (number%i==0)
29         
30             sum = sum + i;
31         
32     
33 
34     return sum;
35 
36 
37 void PrintPN(int m, int n)
38 
39     int is_factorsum = 0;
40     int j;
41     for (int i = m; i <=n; i++)
42     
43         if (factorsum(i) == i)
44         
45             printf("%d = 1", i);
46             for (j = 2; j < i; j++)
47             
48                 if (i % j == 0)
49                 
50                     printf(" + %d", j);
51                 
52             
53             printf("\n");
54             is_factorsum = 1;
55         
56     
57     if (is_factorsum == 0)
58     
59         printf("No perfect number\n");
60         
61