2022/5/27hgc_experience

#include<iostream>
using  namespace  std;
class  Clock
{
public:
    Clock(int  NewH, int  NewM, int  NewS);
    void  ShowTime();
    Clock& operator  ++();          //前置单目运算符重载
    Clock  operator  ++(int);        //后置单目运算符重载
private:
    int  Hour, Minute, Second;
};
//前置单目运算符重载函数
Clock& Clock::operator  ++()
{
    Second++;
    if (Second >= 60) {
        Second -= 60;
       Minute++;
       if (Minute >= 60) {
           Minute -= 60;
           Hour = (Hour + 1) % 24;
       }
    }
    return *this;
    
}
//后置单目运算符重载
Clock  Clock::operator  ++(int)
{                //注意形参表中的整型参数
    Clock old = *this;
    ++(*this);
    return old; 

}


Clock::Clock(int  NewH, int  NewM, int  NewS) {
    Hour = NewH;
    Minute = NewM;
    Second = NewS;
}

void  Clock::ShowTime() {
    cout << Hour << ":" << Minute << ":" << Second << endl;
}
int  main()
{
    Clock  myClock(23, 59, 59);
    cout << "First  time  output:";
    myClock.ShowTime();
    cout << "Show  myClock++:";
    (myClock++).ShowTime();      //后置
    cout << "Show  ++myClock:";
    (++myClock).ShowTime();      //前置
    return  0;
}

#include<iostream>
using  namespace  std;
class  complex
{
public:
    complex(double  r = 0.0, double  i = 0.0) { real = r;  imag = i; }
    complex  operator  +  (complex  c2);        //+重载为成员函数
    complex  operator  -  (complex  c2);          //-重载为成员函数
    void  display();        //输出复数
private:
    double  real;        //复数实部
    double  imag;        //复数虚部
};
//重载函数实现
complex  complex::operator  +(complex  c2)
{

    complex tmp;
    tmp.real = c2.real + real ;
    tmp.imag = c2.imag + imag ; 
    return tmp; 
}
//重载函数实现
complex  complex::operator  -(complex  c2)
{
    complex tmp;
    tmp.real =  real - c2.real ;
    tmp.imag = imag  - c2.imag ;
    return tmp;
}
void  complex::display()
{
    cout << "(" << real << "," << imag << ")" << endl;
}

int  main()
{
    complex  c1(5, 4), c2(2, 10), c3;
    cout << "c1=";  c1.display();
    cout << "c2=";  c2.display();
    c3 = c1 - c2;        //使用重载运算符完成复数减法
    cout << "c3=c1-c2=";
    c3.display();
    c3 = c1 + c2;        //使用重载运算符完成复数加法
    cout << "c3=c1+c2=";
    c3.display();
}