第七周项目 1 实现复数类中的运算符重载（3）

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/*  * Copyright (c) 2015, 烟台大学计算机学院  * All rights reserved.  * 文件名称：main.cpp  * 作    者 ：韩娟  * 完成日期 ：2015年4月30日 * 版 本 号 ：v1.0  ** 问题描述 ：定义一个定义完整的类（是可以当作独立的产品发布，成为众多项目中的“基础工程”）。这样的类在(2)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相加”，其他-、*、/运算符类似 * 输入描述 : 略  * 程序输出 ：按要求输出  */ #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);    friend Complex operator+(Complex &c1,double d2);    friend Complex operator+(double d1,Complex &c2);    friend Complex operator-(Complex &c1,double d2);    friend Complex operator-(double d1,Complex &c2);    friend Complex operator*(Complex &c1,double d2);    friend Complex operator*(double d1,Complex &c2);    friend Complex operator/(Complex &c1,double d2);    friend Complex operator/(double d1,Complex &c2);    void display();private:    double real;    double imag;};//下面定义成员函数Complex operator+(Complex &c1,Complex &c2){    Complex c;    c.real=c1.real+c2.real;    c.imag=c1.imag+c2.imag;    return c;}Complex operator-(Complex &c1,Complex &c2){    Complex c;    c.real=c1.real-c2.real;    c.imag=c1.imag-c2.imag;    return c;}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;}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 d2){    Complex c;    c.real=c1.real+d2;    c.imag=c1.imag;    return c;}Complex operator+(double d1,Complex &c2){    Complex c;    c.real=c2.real+d1;    c.imag=c2.imag;    return c;}Complex operator-(Complex &c1,double d2){    Complex c;    c.real=c1.real-d2;    c.imag=c1.imag;    return c;}Complex operator-(double d1,Complex &c2){    Complex c;    c.real=c2.real-d1;    c.imag=c2.imag;    return c;}Complex operator*(Complex &c1,double d2){    Complex c(d2,0);      return c1*c;}Complex operator*(double d1,Complex &c2){    Complex c(d1,0);    return c*c2;}Complex operator/(Complex &c1,double d2){    Complex c(d2,0);    return c1/c;}Complex operator/(double d1,Complex &c2){    Complex c(d1,0);    return c/c2;}void Complex::display(){    cout<<"("<<real<<","<<imag<<"i)"<<endl;}//下面定义用于测试的main()函数int main(){     Complex c1(3,4),c2(5,-10),c3;    double d=11;    cout<<"c1=";    c1.display();    cout<<"c2=";    c2.display();    cout<<"d="<<d<<endl<<endl;    cout<<"下面是重载运算符的计算结果: "<<endl;    c3=c1+c2;    c3.display();    cout<<"c1+d=";    (c1+d).display();    cout<<"d+c1=";    (d+c1).display();    c3=c1-c2;    cout<<"c1-c2=";    c3.display();    cout<<"c1-d=";    (c1-d).display();    cout<<"d-c1=";    (d-c1).display();    c3=c1*c2;    cout<<"c1*c2=";    c3.display();    cout<<"c1*d=";    (c1*d).display();    cout<<"d*c1=";    (d*c1).display();    c3=c1/c2;    cout<<"c1/c2=";    c3.display();    cout<<"c1/d=";    (c1/d).display();    cout<<"d/c1=";    (d/c1).display();    return 0;}

知识点总结：

写这个的时候要记得细心一点，比如c1+c2和c2+c1是不一样的，都要分别定义，不然输出的时候会有麻烦。

学习心得：

看似很简单的一个用户界面，可是程序员要想到的是很多很多的。

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