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《C++第八周实验报告1-1(2)》----复数类中的运算符重载,用类的友元函数

 
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/*
【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。
(2)方案二:请用类的友元函数,而不是成员函数,完成上面提及的运算符的重载;
*/
/* (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 1.1

* 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。
			(2)方案二:请用类的友元函数,而不是成员函数,完成上面提及的运算符的重载;
* 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- (Complex &c1, Complex &c2);
	friend Complex operator* (Complex &c1, Complex &c2);
	friend Complex operator/ (Complex &c1, Complex &c2);
	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- (Complex &c1, Complex &c2)
{
	return Complex(c1.real - c2.real, c1.imag - 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/ (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;
}

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

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

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

	system("pause");
	return 0;
}

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