用类的有元函数完成运算符的重载

/* * 程序的版权和版本声明部分 * Copyright (c)2013, 烟台大学计算机学院学生 * All rightsreserved * 文件名称：score.cpp * 作 者：赵兰  * 完成日期： 2013年 4月 21日 * 版本号： v1.0 * 输入描述：略 * 问题描述：用类的友元函数完成运算符的重载 * 输出：如下 */  // ui.cpp.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include <iostream>using namespace std;class Complex{public: Complex(){  real=0;imag=0; }                                                             //定义构造函数 Complex(double r,double i) {  real=r;imag=i; }                                                             //构造函数重载 friend Complex operator+(Complex &c1,Complex &c2);            //重载函数作为友元函数 friend Complex operator-(Complex &c1,Complex &c2); friend Complex operator*(Complex &c1,Complex &c2); friend Complex operator/(Complex &c1,Complex &c2); void display();                                               //声明输出函数 private: double real;                                                  //实部 double imag;                                                  //虚部};Complex operator+(Complex &c1,Complex &c2)                       //定义运算符+重载函数{      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)  {     return Complex(c1.real*c2.real-c1.imag*c2.imag,c1.imag*c2.real+c1.real*c2.imag);  }  Complex operator/(Complex &c1,Complex &c2)  {      return Complex((c1.real*c2.real+c1.imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag),(c1.imag*c2.real+c1.real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag));  }  void  Complex::display()  {      cout<<"("<<real<<","<<imag<<"i)"<<endl;  }  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(); return 0;}