第2题

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