C++ Complex + - += -+ <<运算符重载

/*

提供了加减运算符重载的复数类头文件。关于传递引用和传递值，使用const 和不使用const，关于指针成员的使用需要继续学习。。。
同理可以写出乘除法，共轭复数，绝对值， 等其他运算符重载。

*/

#ifndef _COMPLEX_H_
#define _COMPLEX_H_
#include<iostream>
using namespace std;
class Complex
{
public:
//构造函数
Complex(double r = 0, double i = 0):re(r), im(i) {} //在函数体内是赋值assignment re=r im=i
//拷贝构造函数
Complex(const Complex &temp);

//返回实部
double real()const{return re;}

//返回虚部
double imag()const{return im;}

//重载各种运算符
Complex &operator+=(const Complex &);
// ostream &operator<<(ostream &); temp<<cout 形式 为顺应使用习惯 必须写成非成员函数。
Complex &operator = (const Complex &);
Complex &operator-=(const Complex &);

private:
double re;
double im;
//friend Complex &_doapl(Complex *, const Complex &r);
};

//拷贝构造函数
inline Complex::Complex(const Complex &temp):re(temp.real()),im(temp.imag())
{

}

//重载= 就是赋值
inline Complex &Complex::operator = (const Complex &temp)
{
re = temp.real();
im = temp.imag();
return *this;
}

//重载+=
inline Complex &Complex::operator += (const Complex &temp)
{
this->re = this->re + temp.real();
this->im = this->im + temp.imag();
return *this;
}

//重载-=
inline Complex &Complex::operator -= (const Complex &temp)
{
this->re = this->re - temp.real();
this->im = this->im - temp.imag();
return *this;
}

//重载<<
inline ostream &operator << (ostream &os, const Complex &temp)
{
if (temp.imag() == 0)
{
if (temp.real())
{
return os << temp.real();
}
return os << 0;
}
else if (temp.imag() > 0)
{
if (temp.real())
{
return os << temp.real() << "+" << temp.imag() << "i";
}
return os << temp.imag() << "i";
}
else
{
if (temp.real())
{
return os << temp.real() << temp.imag() << "i";
}
return os << temp.imag() << "i";
}
}

//重载 Complex+double
inline Complex operator +(const Complex &x, double &y)
{
return Complex(x.real() + y, x.imag());
}

//重载 Complex+Complex
inline Complex operator +(const Complex &x, const Complex &y)
{
return Complex(x.real() + y.real(), x.imag() + y.imag());
}

//重载 double+Complex
inline Complex operator +(double &y, const Complex &x)
{
return Complex(x.real() + y, x.imag());
}

//重载+Complex
inline Complex operator +(const Complex &x)
{
return x;
}

//重载 Complex-double
inline Complex operator -(const Complex &x, double &y)
{
return Complex(x.real() - y, x.imag());
}

//重载 Complex-Complex
inline Complex operator -(const Complex &x, const Complex &y)
{
return Complex(x.real() - y.real(), x.imag() - y.imag());
}

//重载 double-Complex
inline Complex operator -(double &y, const Complex &x)
{
return Complex(y-x.real(), -x.imag());
}

//重载-Complex
inline Complex operator -(const Complex &x)
{
return Complex(-x.real(), -x.imag());
}

#endif // !_COMPLEX_H_

//如果有错误，或者低能的地方，欢迎指出，感激不尽！！！！！1

C++ Complex + - += -+ <<运算符重载

原文：https://www.cnblogs.com/yangshengjing/p/11625942.html