倒计时

我把你的改了下，这样就行了
#include<iostream>
#include<cstdlib>
#include<Windows.h>
using namespace std;
class Timer
{
private:
int day,hour,minute,second;
public:
Timer(int aDay,int aHour,int aMinute,int aSecond)//系统自动调用
{
day=aDay;//初始化的特殊性
hour=aHour;
minute=aMinute;
second=aSecond;
}

void coutDown();
void printTime();
bool cut();

};
bool Timer::cut(){
if(day==0&&hour==0&&minute==0&&second==0)
return true;
else
return false;
}
int main()
{
Timer opening(1,0,0,2);
for(;;)
{ system("cls");//数字被抹掉
opening.printTime();
Sleep(1000);//显示的数字停留1秒钟
system("cls");
opening.coutDown();
opening.printTime();
if(opening.cut())break;
}
system("pause");
return 0;
}
void Timer::coutDown()
{
second--;

if(second<0)
{
minute--;
if(minute<0)
{ hour--;
minute=59;
if(hour<0)
{
day--;

hour=23;}}
second=60;
second--;

}

}
void Timer::printTime()
{

cout<<"距离奥运会还有:"<<day<<"天"<<endl;
cout<<" "<<hour<<":"<<minute<<":"<<second<<endl;
}

谢谢,看来我还要多练练了

晕啊，楼上的你用什么编译器啊，我用ＶＣ６.０运行过了啊