c++的运算符重载

C++中的加号重载：

如何实现复数的相加：

#include<iostream>using namespace std;class Complex{    public:        Complex(double r=0.0,double i=0.0):real(r),imag(i){}        Complex operator+(const Complex &c2)const;        void display()const{            cout<<"("<<real<<","<<imag<<')'<<endl;        }    private:        double real,imag;};Complex Complex::operator+(const Complex &c2)const{    return Complex(real+c2.real,imag-c2.imag);}int main(){    Complex c1(5,4),c2(2,10),c3;    c3=c1+c2;    c3.display();    return 0;}

C++中的前置++重载：

点的移动：

#include<iostream>using namespace std;class Point{    public:        Point(float a,float b):x(a),y(b){}        Point& operator++();        ~Point(){}        void dispaly()const{            cout<<"("<<x<<","<<y<<")"<<endl;        }    private:        float x,y;};Point& Point::operator++(){    x++;y++;    return *this;}int main(){    Point p(1,2);    (++p).dispaly();p.dispaly();     return 0;}

C++中的后置++重载：

点的移动：

#include<iostream>using namespace std;class Point{    public:        Point(float a,float b):x(a),y(b){}        Point operator++(int);        ~Point(){}        void dispaly()const{            cout<<"("<<x<<","<<y<<")"<<endl;        }    private:        float x,y;};Point Point::operator++(int){    Point p=*this;    x++;y++;    return p;}int main(){    Point p(1,2);    (p++).dispaly();    p.dispaly();    return 0;}