1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 using System.Net;
 7 using System.Net.Sockets;
 8
 9
10 namespace Test
11 {
12     //运算类（）
13     public class Operation
14     {
15         public static double GetResult(double numberA, double numberB, string operate)
16         {
17             double result = 0d;
18             switch (operate)
19             {
20                 case "+":
21                     result = numberA + numberB;
22                     break;
23                 case "-":
24                     result = numberA - numberB;
25                     break;
26                 case "*":
27                     result = numberA * numberB;
28                     break;
29                 case "/":
30                     result = numberA / numberB;
31                     break;
32                 default:
33                     break;
34             }
35             return result;
36         }
37     }
38
39     public class Program
40     {
41         static void Main(string[] args)
42         {
43             try
44             {
45                 Console.Write("请输入数字A：");
46                 string strNumberA = Console.ReadLine();
47                 Console.Write("请选择运算符号（+ 、- 、*、/、）：");
48                 string strOperate = Console.ReadLine();
49                 Console.Write("请输入数字B：");
50                 string strNumberB = Console.ReadLine();
51                 string strResult = "";
52                 strResult = Convert.ToString(Operation.GetResult(Convert.ToDouble(strNumberA),
53                     Convert.ToDouble(strNumberB), strOperate));
54                 Console.WriteLine("结果是：" + strResult);
55                 Console.ReadLine();
56             }
57             catch (Exception ex)
58             {
59                 Console.WriteLine("您输入的有错：" + ex.Message);
60             }
61         }
62     }
63 }