1 using System;
2
3 namespace Csharp
4 {
5 class Program
6 {
7 //枚举
8 public enum TimeOfDay
9 {
10 Morning=0,
11 Afternoon=1,
12 Evening=2
13 }
14
15 static void Main()
16 {
17 WriteGreeting(TimeOfDay.Morning);
18 WriteGreeting(TimeOfDay.Afternoon);
19 WriteGreeting(TimeOfDay.Evening);
20 Console.ReadLine();
21 }
22 static void WriteGreeting(TimeOfDay timeofday)
23 {
24 //switch用法
25 switch (timeofday)
26 {
27 case TimeOfDay.Morning:
28 Console.WriteLine("Good morning!");
29 break;
30 case TimeOfDay.Afternoon:
31 Console.WriteLine("Good afternoon!");
32 break;
33 case TimeOfDay.Evening:
34 Console.WriteLine("Good evening!");
35 break;
36 default:
37 Console.WriteLine("Hello!");
38 break;
39 }
40 }
41 }
42 }