第3题

#include <iostream>using namespace std;class Time  {public:    void set_time(void);    void show_time(void);   private:    int hour;    int minute;    int sec;  };void Time::set_time(void)  {cin>>hour;   cin>>minute;   cin>>sec;  }void Time::show_time(void){cout<<hour<<":"<<minute<<":"<<sec<<endl;}Time t;int main(){ t.set_time();  t.show_time();  return 0;}