救助：这个程序是书上的，我改动了哈，就有问题，请教哈
//4_1.cpp
#include<iostream>
using namespace std;
class Clock        //时钟类型声明
{
    public:        //外部接口，公有成员函数
        Clock(int H,int M,int S);        //构造函数
        Clock(Clock &);        //拷贝构造函数
        ~Clock();        //析构函数
        void SetTime(int NewH = 0,int NewM = 0,int NewS = 0);
        void ShowTime();
    private:        //私有数据成员
        int Hour,Minute,Second;

};
//时钟类成员函数具体实现
Clock::Clock(int H,int M,int S)
{
    Hour = H;
    Minute = M;
    Second = S;
}

void Clock::SetTime(int NewH = 0,int NewM = 0,int NewS = 0)        //"SetTime":重新定义默认参数:参数3
{
    Hour = NewH;
    Minute = NewM;
    Second = NewS;
}

inline void Clock::ShowTime()
{
    cout << Hour << ":" << Minute << ":" << Second << endl;
}

//主函数
void main()
{
    Clock myClock(0,0,0);
    cout << "First time set and output:" << endl;
    myClock.SetTime();    //默认
    myClock.ShowTime();
    cout << "Second time set and output:" << endl;
    myClock.SetTime(8,30,30);
    myClock.ShowTime();
}