C#中枚举类型的使用

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace enumDemo{    enum Days : int     {        Sun, Mon, Tue, Wed, Thu, Fri, Sat    }    class Program    {        static void Main(string[] args)        {            Days day = Days.Sun;            if (Days.Sun == 0)                Console.WriteLine("可以比较");            Console.WriteLine(day+3);            for (day = Days.Sun; day <= Days.Sat; day++)                Console.Write("{0,5}",day);            Console.WriteLine();            foreach(string s in Enum.GetNames(typeof(Days)))                Console.Write("{0,5}", s);                        Console.WriteLine();            Console.WriteLine(Enum.GetName(typeof(Days), 4));            Console.ReadLine();        }    }}