编写简单的计算器

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 }

笔记：

cin 输入

switch case 多条件判断

posted @ 2015-10-03 14:19  We3sT  阅读(823)  评论(0)  编辑  收藏  举报