using System;using System.Collections.Generic;using System.Text;namespace test{    class Program    {        static void Main(string[] args)        {            Date birthday = new Date(1999, 11, 11, new Time(16, 33, 22));//传入的第四个参数是对象            Console.WriteLine("我出生于{0}年{1}月{2}日{3}", birthday.year, birthday.month, birthday.day, birthday.clock.To24());//调用第四个对象的方法        }    }    class Time    {        private int hour;        private int minute;        private int second;        private void SetTime(int h, int m, int s)        {            Hour = h;//属性赋值            Minute = m;//属性赋值            Second = s;//属性赋值        }        public Time()//无参构造函数        {            SetTime(0, 0, 0);        }        public Time(int hourvalue)//一参构造函数        {            SetTime(hourvalue, 0, 0);        }        public Time(int hourvalue, int minutevalue, int secondvalue)//三参构造函数        {            SetTime(hourvalue, minutevalue, secondvalue);        }        public int Hour//属性赋值        {            set { hour = (value >= 0 && value <= 24 ? value : 0); }            get { return hour; }        }        public int Minute//属性赋值        {            set { minute = (value >= 0 && value <= 60 ? value : 0); }            get { return minute; }        }        public int Second//属性赋值        {            set { second = (value >= 0 && value <= 60 ? value : 0); }            get { return second; }        }        public string To24()//显示24小时制方法        {            string output = Hour + ":" + Minute + ":" + Second;            return output;        }        public string To12()//显示24小时制方法        {            string output;            if (Hour >= 12)            {                output = Hour % 12 + ":" + Minute + ":" + Second + "PM";            }            else            {                output = Hour % 12 + ":" + Minute + ":" + Second + "AM";            }            /*下面也是可以的            int HOURTEMP = (Hour == 0 || Hour == 12) ? 00 : （Hour % 12）;            string PMAM = (Hour < 12) ? "AM" : "PM";            string output1 = HOURTEMP + ":" + Minute + ":" + Second + PMAM;*/            return output;        }    }    class Date    {        public int year;        public int month;        public int day;        public Time clock;//对象定义为成员        public Date(int yearvalue, int monthvalue, int dayvalue, Time clockvalue)        {            year = yearvalue;            month = monthvalue;            day = dayvalue;            clock = clockvalue;        }    }}