时间

#include <iostream>   
using namespace std;  
class Time{  
    public:  
        void set_time();  
        void show_time();  
        inline void add_a_sec();//增加1秒钟   
        inline void add_a_minute();//增加1分钟   
        inline void add_a_hour();//增加1小时   
    private:  
        bool is_time(int ,int ,int );  
        int hour;  
        int minute;  
        int sec;  
};  
inline void Time::add_a_sec(){  
    sec+=1;  
    if(sec>59){  
        sec=0;  
        add_a_minute();  
    }  
    return;  
}  
inline void Time::add_a_minute(){  
    minute+=1;  
    if(minute>59){  
        minute=0;  
        add_a_hour();  
    }  
    return;  
}  
inline void Time::add_a_hour(){  
    hour+=1;  
    if(hour>23)  
        hour=0;  
    return;  
}  
void Time::set_time(){  
    char c1,c2;  
    cout<<"情输入时间(格式hh:mm:ss)";  
    while(1){  
        cin>>hour>>c1>>minute>>c2>>sec;  
        if(c1!=':'||c2!=':')  
            cout<<"格式不正确，情重新输入。"<<endl;  
        else if(!is_time(hour,minute,sec))  
            cout<<"时间非法，情重新输入。"<<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;  
    else  
        return true;  
}  
int main(){  
    Time t1;  
    Time &t2=t1;  
    t1.set_time();  
    cout<<"增加1小时1分钟1秒后"<<endl;  
    t1.add_a_sec();  
    t1.add_a_minute();  
    t1.add_a_hour();  
    t2.show_time();  
    return 0;  

}