C#学习10：枚举和结构体

枚举类型是一组命名常量的集合，每种枚举类型都有一种基本的类型，除char之外的所有整数类型都可作为枚举类型的基本类型。

结构类型是一种复合数据类型，它包含常数,域,方法,属性,索引器,操作符的嵌套类型，struct

类型适宜于点,矩形,颜色等轻量级的对象

定义一个枚举类型，两个结构体类型，实现一些基本的操作。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace com
{
    enum Season { Spring, Summer, Fall, Winter };
    struct Time
    {
        public int hours, minutes, seconds;
        public Time(int h, int m, int s)
        {
            hours = h;
            minutes = m;
            seconds = s;
        }
        public Time(int h, int m)
        {
            hours = h;
            minutes = m;
            seconds = 0;  //每个字段都要赋值，这点和类不同
        }
        public int Hours()
        {
            return hours;
        }
        public int Minutes()
        {
            return minutes;
        }
        public int Seconds()
        {
            return seconds;
        }
    }
    struct Date
    {
        public int year;
        public Season s;
        public Date(int a,Season b)
        {
            this.year=a;   // this是关键字,表示类的当前实例
            this.s=b;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Season s = Season.Spring;
            Console.WriteLine(s);
            Season i=0;
            int j;
            for (j = 0; j < 5; j++) //枚举类型是从0开始的
            {
                Console.WriteLine(i);
                i++;
            }
            Time t1= new Time();
            Console.WriteLine(t1.Hours());//结构体默认的为0
            Time t2 = new Time(10, 20, 30);
            Console.WriteLine(t2.Hours());
            Time t3 = new Time(10, 20);
            Console.WriteLine(t3.Hours());
            Date date=new Date(2012,0);
            Console.WriteLine("年份是：{0},季节是: {1}",date.year,date.s);
        }
    }
}