C++类实现引用

//4_1.cpp
#include <iostream>
using namespace std;

class Clock    { //时钟类的定义
public:        //外部接口，公有成员函数
void setTime(int newH = 0, int newM = 0, int newS = 0);
void showTime();
private:    //私有数据成员
int hour, minute, second;
};

//时钟类成员函数的具体实现
void Clock::setTime(int newH, int newM, int newS) {
hour = newH;
minute = newM;
second = newS;
}

inline void Clock::showTime() {
cout << hour << ":" << minute << ":" << second << endl;
}

//主函数
int main() {
Clock myClock;    //定义对象myClock
cout << "First time set and output:" << endl;
myClock.setTime();    //设置时间为默认值
myClock.showTime();    //显示时间
cout << "Second time set and output:" << endl;
myClock.setTime(8, 30, 30);    //设置时间为8：30：30
myClock.showTime();    //显示时间
return 0;
}