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编写简单的计算器

时间:2015-10-03 15:33:36      阅读:131      评论:0      收藏:0      [点我收藏+]

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源码如下:

 1 #include <iostream>
 2 #include <String>
 3 using namespace std;
 4 
 5 int main(int argc, char *argv[])
 6 {    
 7    int a,b; //取输入值变量 
 8    int sum;//求答案变量 
 9    int x;  //判断+-*/变量 
10    cout << "++++++++++++++++++++++++++++++++++++++" << endl; 
11    cout << "+                                    +" << endl;
12    cout << "+           简易计算器               +" << endl;
13    cout << "+                                    +" << endl;
14    cout << "++++++++++++++++++++++++++++++++++++++" << endl; 
15    cout <<"输入第1个数:";
16    cin >> a;    
17    cout <<"输入第2个数:"; 
18    cin >> b;
19    cout << "①相加" << endl;
20    cout << "②相减" << endl;
21    cout << "③相乘" << endl;
22    cout << "④相除" << endl;
23    cout << "请选择上边操作序号:" ;
24    cin >> x;
25    switch(x)
26    {
27         case 1:
28         {
29                 sum=a+b;
30             cout << "两数相加的和为:" << sum << endl;
31             break;
32             
33         }
34         case 2:
35         {
36             sum=a-b;
37             cout << "两数相减的差为:" << sum << endl;
38             break;
39         }
40         case 3:
41         {
42             sum=a*b;
43             cout << "两数相乘的积为:" << sum << endl;
44         break; 
45             
46         }
47         case 4:
48         {
49             sum=a/b;
50             cout << "两数相除的商为:" << sum << endl;
51             break;
52             
53         }
54         
55        
56        
57    }
58         
59    cin.get();
60     return 0; 
61 }

技术分享

笔记:

cin 输入

switch case 多条件判断

编写简单的计算器

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原文地址:http://www.cnblogs.com/hkleak/p/4853360.html

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