《C++第八周实验报告1-1（2）》---在方案二的基础上，扩展+、-、*、/运算符的功能，使之能与double型数据进行运算

/*
【任务1】实现复数类中的运算符重载
定义一个复数类重载运算符+、-、*、/，使之能用于复数的加减乘除。
（3）方案三：在方案二的基础上，扩展+、-、*、/运算符的功能，使之能与double型数据进行运算。设Complex c; double d;
 c?d和d?c的结果为将d视为实部为d的复数同c运算的结果（其中?为+、-、*、/之一）。另外，定义一目运算符-，-c相当于0-c。
*/
/* (程序头部注释开始)
* 程序的版权和版本声明部分
* Copyright (c) 2011, 烟台大学计算机学院学生 
* All rights reserved.
* 文件名称：  Complex.cpp                            
* 作    者：   计114-3 王兴锋     
* 完成日期：    2012  年  4 月  9  日
* 版 本 号：       V 1.2

* 对任务及求解方法的描述部分
* 输入描述： 实现复数类中的运算符重载
* 问题描述：定义一个复数类重载运算符+、-、*、/，使之能用于复数的加减乘除。
			（3）方案三：在方案二的基础上，扩展+、-、*、/运算符的功能，使之能与double型数据进行运算。设Complex c; double d;
			c?d和d?c的结果为将d视为实部为d的复数同c运算的结果（其中?为+、-、*、/之一）。另外，定义一目运算符-，-c相当于0-c。
* 程序输出： +、-、*、/，对复数运算后的结果。
* 程序头部的注释结束
*/

#include <iostream>

using namespace std;

class Complex
{
public:
	Complex(){real = 0; imag = 0;}
	Complex(double r, double i){real = r; imag = i;}
	friend Complex operator+ (Complex &c1, Complex &c2);
	friend Complex operator+ (double &c, Complex &c2);
	friend Complex operator+ (Complex &c2, double &c);
	friend Complex operator- (Complex &c1, Complex &c2);
	friend Complex operator- (double &c, Complex &c2);
	friend Complex operator- (Complex &c2, double &c);
	friend Complex operator* (Complex &c1, Complex &c2);
	friend Complex operator* (double &c, Complex &c2);
	friend Complex operator* (Complex &c2, double &c);
	friend Complex operator/ (Complex &c1, Complex &c2);
	friend Complex operator/ (double &c, Complex &c2);
	friend Complex operator/ (Complex &c2, double &c);
	friend Complex operator- (Complex &c);
	void display();
private:
	double real;
	double imag;
};
void Complex::display()
{
	cout << "(" << real << "," << imag << "i)" << endl;
}
//下面定义友元函数
Complex operator+ (Complex &c1, Complex &c2)
{
	return Complex(c1.real + c2.real, c1.imag + c2.imag);
}
Complex operator+ (double &c, Complex &c2)//+
{
	return Complex(c + c2.real, c2.imag);
}
Complex operator+ (Complex &c2, double &c)//+
{
	return Complex(c + c2.real, c2.imag);
}
Complex operator- (Complex &c1, Complex &c2)
{
	return Complex(c1.real - c2.real, c1.imag - c2.imag);
}
Complex operator- (double &c, Complex &c2)
{
	return Complex(c - c2.real, - c2.imag);
}
Complex operator- (Complex &c2, double &c)
{
	return Complex(c2.real - c, c2.imag);
}
Complex operator* (Complex &c1, Complex &c2)
{
	Complex c;
	
	c.real = c1.real*c2.real - c1.imag*c2.imag;
	c.imag = c1.real*c2.imag + c1.imag*c2.real;
	
	return c;
}
Complex operator* (double &c, Complex &c2)
{
	return Complex(c*c2.real, c*c2.imag);
}
Complex operator* (Complex &c2, double &c)
{
	return Complex(c*c2.real, c*c2.imag);
}
Complex operator/ (Complex &c1, Complex &c2)
{
	Complex c;
	
	c.real = (c1.real*c2.real + c1.imag*c2.imag)/(c2.real*c2.real + c2.imag*c2.imag);
	c.imag = (-c1.real*c2.imag + c1.imag*c2.real)/(c2.real*c2.real + c2.imag*c2.imag);
	
	return c;
}
Complex operator/ (double &c, Complex &c2)
{
	Complex c;
	
	c.real = c*c2.real/(c2.real*c2.real + c2.imag*c2.imag);
	c.imag = -c*c2.imag/(c2.real*c2.real + c2.imag*c2.imag);
	
	return c;
}
Complex operator/ (Complex &c2, double &c)
{
return Complex(c2.real/c, c2.imag/c);
}
Complex operator- (Complex &c)
{
	return Complex(-c.real, -c.imag);
}

int main()
{
	Complex c1(3, 4), c2(5, -10), c3;

	cout<<"c1=";
	c1.display();
	cout<<"c2=";
	c2.display();

	c3 = c1 + c2;
	cout<<"c1+c2=";
	c3.display();
	c3 = c1 + 3.0;
	cout<<"c1+3.0=";
	c3.display();
	c3 = 3.0 + c1;
	cout<<"3.0+c1=";
	c3.display();

	c3 = c1 - c2;
	cout<<"c1-c2=";
	c3.display();
	c3 = c1 - 3.0;
	cout<<"c1-3.0=";
	c3.display();
	c3 = 3.0 - c1;
	cout<<"3.0-c1=";
	c3.display();

	c3 = c1 * c2;
	cout<<"c1*c2=";
	c3.display();
	c3 = c1 * 3.0;
	cout<<"c1*3.0=";
	c3.display();
	c3 = 3.0 * c1;
	cout<<"3.0*c1=";
	c3.display();
	

	c3 = c1 / c2;
	cout<<"c1/c2=";
	c3.display();
	c3 = c1 / 3.0;
	cout<<"c1/3.0=";
	c3.display();
	c3 = 3.0 / c1;
	cout<<"3.0/c1=";
	c3.display();

	system("pause");
	return 0;
}