枚举

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace ConsoleApplication2{    /*     * 枚举是用来限定变量的取值范围     */    enum Gender {Male, Female, Unknow};    class Program    {        static void Main(string[] args)        {            Gender male = Gender.Male;            Gender female = Gender.Female;            Gender unknow = Gender.Unknow;            Console.WriteLine(male);            Console.WriteLine(female);            Console.WriteLine(unknow);            Console.ReadKey();        }    }}