//4_1.cpp
#include<iostream>	
using namespace std;

class Clock	//時鐘類的聲明
{
public:	//外部接口，公有成員函數
	void SetTime(int NewH=0, int NewM=0, int NewS=0);
	void ShowTime();
private:	//私有數據成員
	int Hour,Minute,Second;
};

//時鐘類成員函數的具體實現
void Clock::SetTime(int NewH, int NewM, int NewS)
{
	Hour=NewH;
	Minute=NewM;
	Second=NewS;
}

inline void Clock::ShowTime()
{
	cout<<Hour<<":"<<Minute<<":"<<Second<<endl;
}

//主函數
void main()
{
	Clock myClock;	//定義對象myClock
	cout<<"First time set and output:"<<endl;
	myClock.SetTime();	//設置時間為默認值
	myClock.ShowTime();	//顯示時間
	cout<<"Second time set and output:"<<endl;
	myClock.SetTime(8,30,30);	//設置時間為8：30：30
	myClock.ShowTime();	//顯示時間
}