#include <iostream>
using namespace std;

class Clock
{
public:
    Clock();                // default constructor
    Clock(int, int, int);    // constructor
    Clock(const Clock&);
    ~Clock();
    void SetTime(int, int, int);
    void ShowTime();

private:
    int iHour;
    int iMinute;
    int iSecond;
};



Clock::Clock()
{
    iHour = iMinute = iSecond = 0;
    cout << "constructor1" << endl;
}


Clock::Clock(int h, int m, int s)
{
    iHour = h;
    iMinute = m;
    iSecond = s;
    cout << "constructor2" << endl;
}

Clock::Clock(const Clock &r) : iHour(r.iHour), iMinute(r.iMinute), iSecond(r.iSecond)
{
    cout << "constructor3" << endl;
}

Clock::~Clock()
{
    cout << "destrcutor" << endl;
}

void Clock::SetTime(int h, int m, int s)  
{
    iHour = h;
    iMinute = m;
    iSecond = s;
}

/*
为什么我将上面的函数改为：
void Clock::SetTime(int h, int m, int s) : iHour(h), iMinute(m), iSecond(s)
{}
时，编译会出错？
*/

void Clock::ShowTime()
{
    cout << iHour << " : " << iMinute << " : " << iSecond << endl;
}


void f(Clock c)
{
    c.ShowTime();
}                        // call Clock::~Clock() to destruct c

void g(Clock &c)
{
    c.ShowTime();
}

Clock h()
{
    Clock c(2, 13, 25);
    c.ShowTime();
    return c;        // call Clock::Clock(const Clock&) to construct a return value object
}

int main()
{
    Clock c1(13, 24, 23);
    Clock c2 = c1;        // call Clock::Clock(const Clock&)

    c1.SetTime(10, 5, 16);
    c1.ShowTime();
    c2.ShowTime();

    Clock *p;
    p = new Clock(c2);    // call Clock::Clock(const Clock&)
    p->ShowTime();
    delete p;            // call Clock::~Clock to destruct the object pointed by p            

    cout << "------------" << endl;
    f(c1);                // call Clock::Clock(const Clock&)
    cout << "------------" << endl;
    g(c1);
    cout << "------------" << endl;
    Clock c3 = h();
        cout << "-------------" << endl;


    return 0;            // call Clock::~Clock for 2 times to destruct c2 & c1
}