C#學習10

C#學習10：枚舉和結構體

枚舉類型是一組命名常量的集合，每種枚舉類型都有一種基本的類型，除char之外的所有整數類型都可作為枚舉類型的基本類型。

結構類型是一種複合資料型別，它包含常數,域,方法,屬性,索引器,操作符的巢狀型別，struct

類型適宜於點,矩形,顏色等輕量級的對象

定義一個枚舉類型，兩個結構體類型，實現一些基本的操作。

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;  //每個欄位都要賦值，這點和類不同        }        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是關鍵字,表示類的當前執行個體            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++) //枚舉類型是從0開始的            {                Console.WriteLine(i);                i++;            }            Time t1= new Time();            Console.WriteLine(t1.Hours());//結構體預設的為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},季節是: {1}",date.year,date.s);        }    }}