时钟

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

struct Time{
	int hour;
	int minute;
	int second;
}; 

void set(Time* p, int h, int m, int s)
{
	p->hour= h;
	p->minute= m;
	p->second= s;
}

void tick(Time* p)
{
	long t=time(NULL);
	while (time(NULL) == t);
	if (++p->second >= 60)
	{
		p->second = 0;
		
		if (++p->minute >= 60)
		{
			p->minute = 0;
		}
		
		if (++p->hour >= 24)
		{
			p->hour = 0;
		}
	}
}

void show(Time* p)
{
	cout << '\r';
	if (p->hour < 10) cout << 0;
	cout << p->hour << ':';
	if (p->minute < 10) cout << 0;
	cout << p->minute << ':';
	if (p->second < 10) cout << 0;
	cout << p->second << flush;
//	cout << endl;
}

void run(Time* p)
{
	while (1)
	{
		tick(p);
		show(p);
	}
}

int main()
{
	Time t;
	set(&t, 5, 50, 35);
	run(&t);
	return 0;
}