using System;using System.Collections;using System.Collections.Generic;using System.Linq;using System.Text;using System.Text.RegularExpressions;namespace c编程练习题{    public enum QQState    {        OnLine=1 ,   // 枚举类型默认初始值为0，赋给1值才能符合控制台输出结果。        OffLine ,        Leave ,        Busy ,        QMe,    }    class Program          {        static void Main(string[] args)        {                    //提示用户选择一个在线状态，我们接收，并将用户的输入转化成枚举类型。            //再次打印到控制台中。              Console.WriteLine("请输入您的QQ在线状态(1--Online,2--Offline 3--Leave 4--Busy 5--QMe)");            string input = Console.ReadLine();            switch (input)            {                case "1": QQState s1 = (QQState)Enum.Parse(typeof(QQState), input);                    Console.WriteLine("您选择的在线状态是{0}", s1);                    break;                case "2": QQState s2 = (QQState)Enum.Parse(typeof(QQState), input);                    Console.WriteLine("您选择的在线状态是{0}", s2);                    break;                case "3": QQState s3 = (QQState)Enum.Parse(typeof(QQState), input);                    Console.WriteLine("您选择的在线状态是{0}", s3);                    break;                case "4": QQState s4 = (QQState)Enum.Parse(typeof(QQState), input);                    Console.WriteLine("您选择的在线状态是{0}", s4);                    break;                case "5": QQState s5 = (QQState)Enum.Parse(typeof(QQState), input);                    Console.WriteLine("您选择的在线状态是{0}", s5);                    break;            }            Console.ReadLine();                    }    }}