代码输出：
#include <iostream> using namespace std; class Time { public:void add_seconds(int);void add_minutes(int);void add_hours(int); inline void add_a_sec();//内置函数inline void add_a_minute();inline void add_an_hour(); void set_time( ); void show_time( );private: bool is_time(int, int, int); int hour; int minute; int sec; }; void Time::set_time( ) { char c1,c2; cout<<"请输入时间(格式hh:mm:ss)"<<endl; 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()//各加一{sec+=1; if(sec>60)add_a_minute();}inline void Time::add_a_minute(){minute+=1;if(minute>60)add_an_hour();}inline void Time::add_an_hour(){hour+=1;if(hour>23)hour=0;}void Time::add_seconds(int n)//各加n{sec+=n;if(sec>60){add_minutes(sec/60);sec=sec%60;}} void Time::add_minutes(int n)//各加n{minute+=n;if(minute>60){add_hours(minute/60);minute=minute%60;}}void Time::add_hours(int n)//各加n{hour+=n;if(hour>24){hour=hour%24;}}int main( ) { Time t1;Time t3; Time &t2=t1;int h,m,s;//时，分，秒 t1.set_time( );cout<<"现在是:"<<endl;t2.show_time( );t1.add_a_sec();cout<<"增加1秒后为:"<<endl;t1.show_time( );t1.add_a_minute();cout<<"增加1分钟后为:"<<endl;t2.show_time( );t1.add_an_hour();cout<<"增加1小时后为:"<<endl;t1.show_time( ); cout<<"请输入需要增加的时，分，秒:"<<endl; cin>>h>>m>>s; t3=t1; t3.add_hours(h); t3.add_minutes(m); t3.add_seconds(s); t3.show_time();return 0; }
运行结果：
