#include <iostream.h>
class Clock  {
    private:
        int h, m, s;
    public:
        Clock(int vh=0, int vm=0, int vs=0) {
             h = vh; m = vm; s = vs;
        }
        operator ++();
        showtime()  {
             cout << h << ":" << m << ":" << s << endl;
             return 0;
        }            
};             
inline Clock::operator++()  // 前置
{  s ++;
    if(s >= 60)  {
        s = s-60;
        m ++;
        if(m >= 60)  {
             m = m-60;
             h ++;
             h = h % 24;
        }
    }
    cout << "++ Clock：";
}
main()
{   Clock  myclock(23, 59, 59);
     cout << "開始時間：";
     myclock.showtime();
     ++ myclock;
     myclock.showtime();
	 ++ myclock;
     myclock.showtime();
	 return 0;
}