class Time {
public:
   Time();
   void setHour(int h);
   void setMinute(int m);
   void setSecond(int s);
   int getHour(void) const;
   int getMinute(void) const;
   int getSecond(void) const;
   void tick(void);
private:
   int hour;
   int minute;
   int second;
};