编写时间的类函数

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#include <iostream>
using namespace std;
class Time
{
public:
 void set_time( );   
 void show_time( );
 inline void add_a_sec();
 inline void add_a_minute();
 inline void add_an_hour();
 void add_seconds(int);
 void add_minutes(int);
 void add_hours(int);
private: 
 bool is_time(int, int, int);
 int hour;
 int minute;
 int sec;
};

int main( )
{
 Time t1;  
 Time &t2=t1;
 int s,m,h;
 t1.set_time( );   
 t2.show_time( );
 t1.add_a_sec();
 t1.add_a_minute();
 t1.add_an_hour();
 cout<<"增加一秒钟,一分钟,一小时后的时间:";
 t2.show_time( );
 cout<<"请输入增加的秒数:";
 cin>>s;
 t1.add_seconds(s);
 cout<<"请输入增加的分数:";
 cin>>m;
 t1.add_minutes(m);
 cout<<"请输入增加的小时:";
 cin>>h;
 t1.add_hours(h);
 t2.show_time( );
 return 0;
}

void Time::set_time( ) 
{
 char c1,c2;
 cout<<"请输入时间(格式hh:mm:ss)";
 while(1)
 {
  cin>>hour>>c1>>minute>>c2>>sec;
  if(c1!=':'||c2!=':')
   cout<<"格式不正确，请重新输入"<<endl;
  else if (!is_time(hour,minute,sec))
   cout<<"时间非法，请重新输入"<<endl;
  else 
   break;
 }
}

void Time::show_time( )      
{
 cout<<hour<<":"<<minute<<":"<<sec<<endl;
}

bool Time::is_time(int h,int m, int s)
{
 if (h<0 ||h>24 || m<0 ||m>60 || s<0 ||s>60)
  return false;
 return true;
}
inline void Time::add_a_sec()
{
 sec=sec+1;
 if(sec>=60)
 {
  minute=minute+1;
 sec=0;
 }
 if(minute>=60)
 {
  hour=hour+1;
 minute=0;
 }
 if(hour>24)
  hour=1;
}

inline void Time::add_a_minute()
{
 minute=minute+1;
 if(minute>=60)
  hour=hour+1;
    if(hour>24)
  hour=1;
}
inline void Time:: add_an_hour()
{
 hour=hour+1;
    if(hour>24)
  hour=1;
}
void Time:: add_seconds(int n)
{
 
 sec=sec+n;
    if(sec>=60)
	{
     add_minutes(sec/60);
     sec=sec%60;
	}
}

void Time::add_minutes(int n)
{

 minute=minute+n;
 while(minute>=60)
 {
	 add_hours(minute/60);
     minute=minute%60;
 }
    if(hour>24)
  hour=hour%24;
}

void Time:: add_hours(int n)
{
 
 hour=hour+n;
 if(hour>24)
 {
  hour=hour%24;
 }
}