1 #include "stdafx.h"
2 #include <iostream>
3 using namespace std;
4
5 int main()
6 {
7 double number1, number2;
8 double result;
9 int way;
10
11 cout << "加法运算请选择 1" << endl;
12 cout << "减法运算请选择 2" << endl;
13 cout << "乘法运算请选择 3" << endl;
14 cout << "除法运算请选择 4" << endl;
15 cout << "请输入运算方法序号:";
16 cin >> way;
17
18 if (way < 1 || way>4)
19 {
20 cout << "请重新输入序号：";
21 cin >> way;
22 }
23 else
24 {
25 cout << "请输入两个数:";
26 cin >> number1 >> number2;
27 }
28
29 switch (way)
30 {
31 case 1:cout << "这是加法运算:";
32 {
33 result = number1 + number2;
34 }
35 cout << "和是:" << result << endl;
36 break;
37
38 case 2:cout << "这是减法运算:";
39 {
40 result = number1 - number2;
41 }
42 cout << "差是:" << result << endl;
43 break;
44
45 case 3:cout << "这是乘法运算:";
46 {
47 result = number1 * number2;
48 }
49 cout << "积是:" << result << endl;
50 break;
51
52 case 4:cout << "这是除法运算:";
53 {
54 result = number1/number2;
55 }
56 cout << "商是:" << result << endl;
57 break;
58
59 default:
60 cout << "error!";
61 break;
62 }
63 return 0;
64 }
