编写一个时间类,实现时间的加、减、读和输出

{
int H,M,S;
H=hour-a.hour;
M=minute-a.minute;
S=second-a.second;
if(S<0)
{
S=(S+60)%60;
M=M-1;
}
if(M<0)
{
M=(M+60)%60;
H=H-1;
}
if(H<0)
H=(H+24)%24;
return Time(H,M,S);
hour=(hour>=0&&hour<24)?hour:0;
}
void Time::Display()
{
cout<<hour<<":"<<minute<<":"<<second<<endl;
}
Time Time::operator+(Time &a)//时间的加，若超出正常范围，则进位
{
int H,M,S;
{
cout<<"Data error!Please input again:"<<endl;//输入时间不合法，重新输入
cin>>hour>>minute>>second;
}
second=(second>=0&&second<60)?second:0;//判断输入时间的显示
minute=(minute>=0&&minute<60)?minute:0;
//编写一个时间类，实现时间的加、减、读和输出
//class.h
#include <iostream.h>
class Time
{
public:
Time(int H=0,int M=0,int S=0)
{
hour=H;
minute=M;second=S; Nhomakorabea}
void SetTime();
void Display();
H=(a.hour+hour+(a.minute+minute+(a.second+second)/60)/60)%24;
M=(a.minute+minute+(a.second+second)/60)%60;
S=(a.second+second)%60;
return Time(H,M,S);
}
Time Time::operator-(Time &a)//时间的减，若超出正常范围，向前借位
c=a+b;
c.Display();
cout<<endl<<"c=a-b=";
c=a-b;
c.Display();
}
Time operator+(Time &);
Time operator-(Time &);
private:
int hour,minute,second;
};
//function.cpp
void Time::SetTime()
{
cin>>hour>>minute>>second;//输入时间
if(hour>24||hour<0||minute>60||minute<0||second>60||second<0)
}
void main()
{
Time a,b,c;
cout<<"请输入A的时间："<<endl;
a.SetTime();
cout<<"请输入B的时间："<<endl;
b.SetTime();
cout<<"A的时间为：";
a.Display();
cout<<"B的时间为：";
b.Display();
cout<<"c=a+b=";