#include <iostream>

 using namespace std;

 class Time

 {

 private:

     int hour;

     int minute;

     int second;

 public:

     //Time() //无参够创函数

     //{

     //    hour = 0; minute = 0; second = 0;

     //}

     //Time(int h, int m, int s) //带参构造函数

     //{

     //    hour = h; minute = m; second = s;

     //}

     Time(int h = , int m = , int s = ) : hour(h), minute(m), second(s){} //带参数初始化表的构造函数

     void Set(int h, int m, int s);

     void Show();

 };

 void Time::Set(int h, int m, int s)

 {

     hour = h; minute = m; second = s;

 }

 void Time::Show()

 {

     cout << hour << ":" << minute << ":" << second << endl;

 }

 int main()

 {

     Time t1;

     t1.Show();

     t1.Set(, , );

     t1.Show();

     Time t2(, , );

     t2.Show();

     return ;

 }