倒计时时钟 面向对象

#include <iostream>
using namespace std;
#include <ctime>

class Clock{
private: 
	int hour;
	int minute;
	int second;
public:
	void set(int h, int m, int s);
	void tick();
	void show();
	void run();
};

void Clock::set(int h, int m, int s)
{
	hour = h;
	minute = m;
	second = s;
}

void Clock::tick()
{
	time_t t = time(NULL);
	while (time(NULL) == t);
	
	if (--second < 0)
	{
		second = 59;
		
		if (--minute < 0)
		{
			minute = 59;
			
			--hour;
		}
	}
	
}

void Clock::show()
{	
	cout << '\r';
	if (hour<10)
		cout << 0 ;
	cout << hour << ':' ;
	if (minute<10)
		cout << 0;
	cout << minute << ':';
	if (second < 10) 
		cout << 0;
	cout << second << flush;
}

void Clock::run()
{
	while (hour !=0 || minute !=0 || second !=0)
	{
		tick();
		show();
	}
	cout << "time out !" << endl;
}

int main()
{
	Clock c;
	c.set(0,1,0);
	c.run();
}