《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

【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 马琳     
* 完成日期：    2012  年  4 月  

11 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;
}

 
 
友元函数不同于成员函数，参数应设置为两个，因为他没有隐藏的THIS指针