第八周实验报告人任务1

/* (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：                              * 作    者：王引琳                              * 完成日期：   2012      年   4    月    10    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： * 程序输出： * 程序头部的注释结束*/（1）方案一：请用类的成员函数完成运算符的重载；#include <iostream>using namespace std;class Complex{public:Complex(){real=0;imag=0;}Complex(double r,double i){real=r;imag=i;}Complex operator+(Complex &c2);Complex operator-(Complex &c2);Complex operator*(Complex &c2);Complex operator/(Complex &c2);void display();private:double real;double imag;};//下面定义成员函数Complex Complex:: operator+(Complex &c2){return Complex(real+c2.real,imag+c2.imag);}Complex Complex ::operator-(Complex &c2){return Complex(real-c2.real,imag-c2.imag);}Complex Complex:: operator*(Complex &c2){Complex c;c.real=real*c2.real+imag*c2.imag;c.imag=real*c2.imag+imag*c2.real;return c;} Complex Complex ::operator/(Complex &c2){Complex c;c.real=(real*c2.real +imag*c2.imag )/(c2.real *c2.real+c2.imag*c2.imag);c.imag =(imag*c2.real - real*c2.imag )/(c2.real *c2.real+c2.imag*c2.imag);return c;}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();system("pause");return 0;}

（2）友元函数：

#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;};//下面定义成员函数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.imag*c2.real - c1.real*c2.imag )/(c2.real *c2.real+c2.imag*c2.imag);return c;}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();system("pause");return 0;}

3）方案三：在方案二的基础上，扩展+、-、*、/运算符的功能，使之能与double型数据进行运算。设Complex c; double d; c?d和d?c的结果为将d视为实部为d的复数同c运算的结果（其中?为+、-、*、/之一）。另外，定义一目运算符-，-c相当于0-c。#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,double &c2);friend Complex operator+(double &c2,Complex &c1);friend Complex operator-(Complex &c1,Complex &c2);friend Complex operator-(Complex &c1,double &c2);   friend Complex operator-(double &c2,Complex &c1);friend Complex operator*(Complex &c1,Complex &c2);friend Complex operator*(Complex &c1,double &c2);    friend Complex operator*(double &c2,Complex &c1);friend Complex operator/(Complex &c1,Complex &c2);friend Complex operator/(Complex &c1,double &c2);    friend Complex operator/(double &c2,Complex &c1);void display();private:double real;double imag;};//下面定义成员函数Complex operator+(Complex &c1,Complex &c2){return Complex(c1.real+c2.real,c1.imag+c2.imag);}Complex operator+(Complex &c1,double &c2){    return Complex(c1.real+c2,c1.imag);}Complex operator+(double &c2,Complex &c1){    return Complex(c1.real+c2,c1.imag);}Complex operator-(Complex &c1,Complex &c2){return Complex(c1.real-c2.real,c1.imag-c2.imag);}Complex operator-(Complex &c1,double &c2){return Complex(c1.real-c2,c1.imag);}Complex operator-(double &c2,Complex &c1){return Complex(c2-c1.real,-c1.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,double &c2){Complex c;c.real=c1.real*c2;c.imag=c1.imag*c2;return c;} Complex operator*(double &c2,Complex &c1){Complex c;c.real=c1.real*c2;c.imag=c1.imag*c2;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.imag*c2.real - c1.real*c2.imag )/(c2.real *c2.real+c2.imag*c2.imag);return c;}Complex operator/(Complex &c1,double &c2){Complex c;c.real=c1.real/c2;c.imag =c1.imag/c2;return c;}Complex operator/(double &c2,Complex &c1){          Complex c;    c.real =(c2 * c1.real) / (c1.real * c1.real + c1.imag * c1.imag);    c.imag =( - c2 * c1.imag) / (c1.real * c1.real + c1.imag * c1.imag);    return c;}void Complex::display( )   {cout<<"("<<real<<","<<imag<<"i)"<<endl;}int main(){Complex c1(3,4),c2(5,-10),c3;double i=3;cout<<"c1=";c1.display();cout<<"c2=";c2.display();c3=c1+c2;cout<<"c1+c2=";c3.display();c3=c1+i;cout<<"c1+3=";c3.display ();c3=i+c1;cout<<"3+c1=";c3.display ();c3=c1-c2;cout<<"c1-c2=";c3.display();c3=c1-i;cout<<"c1-3=";c3.display();c3=i-c1;cout<<"i-c1=";c3.display();c3=c1*i;cout<<"c1*3=";c3.display ();c3=i*c1;cout<<"3*c1=";c3.display ();c3=c1*c2;cout<<"c1*c2=";c3.display();c3=c1/i;cout<<"c1/3=";c3.display ();c3=i/c1;cout<<"3/c1=";c3.display ();c3=c1/c2;cout<<"c1/c2=";c3.display();system("pause");return 0;}

上机感言：
定义友元函数时，要定义两个参数。将一个复数和一个整数相加可以吧运算符重载函数作为成员函数，定义了运算符的重载感觉c++的功能更强大了。