《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 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;}