Part-Three 类与对象

#include<iostream>
using namespace std;
class Clock{
    public :
        void setTime(int newH=0,int newM=0,int newS=0);//设置函数的默认值，注意！在此处声明时设定后外部实现时就不用设置了 
        void showTime();
    private:
        int hour,minute,second;
};

//时钟类的具体实现
void Clock::setTime(int newH,int newM,int newS)
{
    hour=newH;
    minute=newM;
    second=newS;
 } 
 
 void Clock::showTime()
 {
     cout<<hour<<":"<<minute<<":"<<second<<endl;
 }

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

#include<iostream>
using namespace std;
class Clock{
    public :
        void setTime(int newH=0,int newM=0,int newS=0);//设置函数的默认值，注意！在此处声明时设定后外部实现时就不用设置了 
        void showTime();
        Clock(int newH=0,int newM=0,int newS=0);//含参构造函数
        Clock(); //无参构造函数 
        Clock(Clock& clockCopy);//复制构造函数
        ~Clock(){}//内置的析构函数 
    private:
        int hour,minute,second;
};

//时钟类的具体实现
Clock::Clock(int newH,int newM,int newS)
{
    hour=newH;
    minute=newM;
    second=newS;
 } 
 
Clock::Clock()
{
    hour=0;
    minute=0;
    second=0;
 } 
 
Clock::Clock(Clock& clockCopy)//复制构造函数是把传过来的对象的属性赋值给当前对象 
{
    hour=clockCopy.hour;
    minute=clockCopy.minute;
    second=clockCopy.second; 
 } 
void Clock::setTime(int newH,int newM,int newS)
{
    hour=newH;
    minute=newM;
    second=newS;
 } 
 
 void Clock::showTime()
 {
     cout<<hour<<":"<<minute<<":"<<second<<endl;
 }

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