程式碼如下：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace Demo5

{

class Time

{

private int hour;

private int minute;

private int second;

public Time(int hour, int minute, int second)

{

this.hour = hour;

this.minute = minute;

this.second = second;

}

public void IncrementHour()

{

if (this.hour < 23)

{

this.hour++;

}

else

{

this.hour = 0;

}

}

public void DecrementHour()

{

if (this.hour > 0)

{

this.hour--;

}

else

{

this.hour = 23;

}

}

public void IncrementMinute()

{

if (this.minute < 59)

{

this.minute++;

}

else

{

this.minute = 0;

IncrementHour();

}

}

public void DecrementMinute()

{

if (this.minute > 0)

{

this.minute--;

}

else

{

this.minute = 59;

DecrementHour();

}

}

public void IncrementSecond()

{

if (this.second < 59)

{

this.second++;

}

else

{

this.second = 0;

IncrementMinute();

}

}

public void DecrementSecond()

{

if (this.second > 0)

{

this.second--;

}

else

{

this.second = 59;

DecrementMinute();

}

}

public void Display()

{

Console.WriteLine("{0}:{1}:{2}", hour, minute, second);

}

}

class Program

{

static void Main(string[] args)

{

Time time = new Time(22, 33, 20);

time.Display();

// 小時加1

time.IncrementHour();

time.Display();

// 小時減1

time.DecrementHour();

time.Display();

// 分鐘加1

time.IncrementMinute();

time.Display();

// 分鐘減1

time.DecrementMinute();

time.Display();

// 秒加1

time.IncrementSecond();

time.Display();

// 秒減1

time.DecrementSecond();

time.Display();

Console.ReadKey();

}

}

}