C++---倒计时代码

#include <iostream>
using namespace std;
class time{
int hour,minute,second;
public:
time(int a=0,int b=0,int c=0){hour=a;minute=b;second=c;}
void T(int hour,int minute,int second);
};
int main()
{
int hour,minute,second,s;
time m;
        cout<<"请输入您要倒记的时间(单位:秒)"<<endl;
cin>>s;
    if(s>59)
{
hour=s/3600;
minute=s%3600/60;
second=s%3600%60;
}
printf("%.2d:%.2d:%.2d\n",hour,minute,second);
m.T(hour,minute,second);
cout<<"time is up"<<endl;
return 0;
}
void time::T(int hour,int minute,int second)
{
while(hour!=0||minute!=0||second!=0)
{
           if(second!=0)