c++中运算符重载，+，-，--，+=,-=,*,/,*=,/=,

#include<iostream>#include<stdlib.h>using namespace std; class Complex{public:    Complex(float r=0,float i =0):_r(r),_i(i){}void print() const{cout<<" _r "<<_r<<" _i "<<_i<<endl;}private:float _r;float _i;public:const Complex& operator+=(const Complex & y);const Complex& operator-=(const Complex & y);const Complex& operator*=(const Complex & y);const Complex& operator/=(const Complex & y);const Complex operator-(const Complex & y);const Complex operator+(const Complex & y);const Complex Complex::operator--();const bool operator==(const Complex & y);const bool operator!=(const Complex & y);};inline const Complex Complex::operator-(const Complex & y){Complex c;c._r=_r-y._r;c._i=_i-y._i;return c;}inline const Complex Complex::operator--(){_r=_r-1;_i=_i-1;return *this;}inline const bool Complex::operator==(const Complex & y){bool b=true;if((*this)._r!=y._r||(*this)._i!=y._i)b=false;return b;}inline const bool Complex::operator!=(const Complex & y){bool b=true;if((*this)._r==y._r&&(*this)._i==y._i)b=false;return b;}inline const Complex Complex::operator+(const Complex & y){Complex c;c._r=_r+y._r;c._i=_i+y._i;return c;}inline const Complex& Complex::operator+=(const Complex & y){_r=_r+y._r;_i=_i+y._i;return *this;}inline const Complex& Complex::operator-=(const Complex & y){*this=*this-y;    return *this;}inline const Complex& Complex::operator*=(const Complex & y){_r=_r*y._r-_i*y._i;_i=_r*y._i+_i*y._r;return *this;}inline const Complex& Complex::operator/=(const Complex & y){if(y._r==0 && y._i==0){exit(1);}float den=_r*y._r+_i*y._i;_r=(_r*y._r+_i*y._i)/den;_i=(_i*y._r-_r*y._i)/den;    return *this;}int main(){Complex x(2,3),y(-1,3);cout<<" x is ";x.print();cout<<" y is ";y.print();(x+=y).print();x.operator+=(y).print();(x-=y).print();x.operator-=(y).print();(x*=y).print();x.operator*=(y).print();(x/=y).print();x.operator/=(y).print();cout<<(x==y)<<endl;cout<<(x!=y)<<endl;return 0;}