第八周实验报告（任务一）【扩展运算符的功能】

/* (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：运算符的重载

* 作 者： 张培培

* 完成日期：2012 年 04月 09日

* 版 本 号：

* 对任务及求解方法的描述部分

* 输入描述：

*问题描述：通过类的成员函数和友元函数分别实现运算符的重载

* 程序输出：

* 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);//复数相加friend Complex operator-(Complex &c1,Complex &c2);//复数相减friend Complex operator*(Complex &c1,Complex &c2);//复数相乘friend Complex operator/(Complex &c1,Complex &c2);//复数相除friend Complex operator+(const double &a,Complex &c2);//实数与复数相加friend Complex operator+(Complex &c1,const double &a);//复数与实数相数friend Complex operator-(Complex &c1);//重载一目运算符，求复数的相反数void display();private:double real;double imag;};//下面定义成员函数//复数相加Complex operator+(Complex &c1,Complex &c2){Complex c;c.real=c1.real+c2.real;c.imag=c1.imag+c2.imag;return c;}//复数相减Complex operator-(Complex &c1,Complex &c2){Complex c;c.real=c1.real-c2.real;c.imag=c1.imag-c2.imag;return c;}//复数相乘Complex operator*(Complex &c1,Complex &c2){Complex c;c.real=c1.real*c2.real-c1.imag*c2.imag;c.imag=c1.imag*c2.real+c1.real*c2.imag;return c;}//复数相除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.imag*c2.real-c1.real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);return c;}//实数与复数相加Complex operator+(const double &a,Complex &c2){return Complex(a+c2.real,c2.imag);}//复数与实数相加Complex operator+(Complex &c1,const double &a){return Complex(c1.real+a,c1.imag);}//重载一目运算符，求复数的相反数Complex operator-(Complex &c1){return Complex(-c1.real,-c1.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();c3=1.57+c2;cout<<"1.57+c2=";c3.display();c3=c1+1.57;cout<<"c1+1.57=";c3.display();c3=-c1;c3.display();system("pause");return 0;}

上机感言：复数与实数相加时可以通过成员函数和友元函数完成运算符的重载；

                   实数与复数相加时只能通过友元函数完成运算符的重载；

                  运算符重载时不能改变参数的个数；