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;}