一个计算器

 1 #include <stdio.h>
 2 #include <stdlib.h>
 3
 4 void addition()
 5 {
 6     int a, b;
 7     printf("请输入2个数字：\n");
 8     scanf("%d%d", &a, &b);
 9     printf("%d + %d = %d\n", a, b, a + b);
10 }
11
12 void substraction()
13 {
14     int a, b;
15     printf("请输入2个数字：\n");
16     scanf("%d%d", &a, &b);
17     printf("%d - %d = %d\n", a, b, a - b);
18 }
19
20 void multiplication()
21 {
22     int a, b;
23     printf("请输入2个数字：\n");
24     scanf("%d%d", &a, &b);
25     printf("%d * %d = %d\n", a, b, a * b);
26 }
27
28 void division()
29 {
30     int a, b;
31     printf("请输入2个数字：\n");
32     scanf("%d%d", &a, &b);
33     while (b == 0)
34     {
35         printf("请重新输入：\n");
36         scanf("%d%d", &a, &b);
37     }
38     printf("%d / %d = %d …… %d", a, b, a / b, a % b);
39 }
40
41 void operation()
42 {
43     printf("输入数字选择对应的运算操作符\n");
44     printf("1:加法\t2:减法\n3:乘法\t4:除法\n0:退出\n");
45     int opera = 0;
46     scanf("%d", &opera);
47     try
48     {
49         if (opera == 1)
50         {
51             addition();
52         }
53         else if (opera == 2)
54         {
55             substraction();
56         }
57         else if (opera == 3)
58         {
59             multiplication();
60         }
61         else if (opera == 4)
62         {
63             division();
64         }
65         else if (opera == 0)
66         {
67             exit(0);
68         }
69         else
70         {
71             throw 1;
72         }
73     }
74     catch (int i)
75     {
76         printf("输入错误\n");
77     }
78     operation();
79 }
80
81 int main()
82 {
83     printf("欢迎使用计算机器！\n");
84     operation();
85     return 0;
86 }