第十二周项目1-实现复数类中的运算符重载（1.3实现复数与实数相加减乘除）

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问题及代码：

/* *Copyright (c) 2016，烟台大学计算机学院 *All rights reserved. *文件名称：zwj.cpp *作    者：张伟晶 *完成日期：2016年5月12日 *版 本 号：v1.0 * *问题描述：用类的友元函数完成运算符重载,定义一个完整的类，使之能与double型想加减乘除 *输入描述： *程序输出： */#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+(const Complex &c1,const Complex &c2);    friend Complex operator-(const Complex &c1,const Complex &c2);    friend Complex operator*(const Complex &c1,const Complex &c2);    friend Complex operator/(const Complex &c1,const Complex &c2);    void display();    // 扩充功能1    friend Complex operator+(Complex c1,double d);    friend Complex operator-(Complex c1,double d);    friend Complex operator*(Complex c1,double d);    friend Complex operator/(Complex c1,double d);    //扩充2    friend Complex operator+(double d,Complex c1);    friend Complex operator-(double d,Complex c1);    friend Complex operator*(double d,Complex c1);    friend Complex operator/(double d,Complex c1);private:    double real;    double imag;};//扩充2Complex operator+(double d,Complex c1){    return Complex(d+c1.real,c1.imag);}Complex operator-(double d,Complex c1){    return Complex(d-c1.real,c1.imag);}Complex operator*(double d,Complex c1){    return Complex(d*c1.real,c1.imag);}Complex operator/(double d,Complex c1){    return Complex(d/c1.real,c1.imag);}//扩充功能Complex operator+(Complex c1,double d){    return Complex(c1.real+d,c1.imag);}Complex operator-(Complex c1,double d){    return Complex(c1.real-d,c1.imag);}Complex operator*(Complex c1,double d){    return Complex(c1.real*d,c1.imag);}Complex operator/(Complex c1,double d){    return Complex(c1.real/d,c1.imag);}//下面定义成员函数 //友元函数Complex operator+(const Complex &c1,const Complex &c2){    return Complex(c1.real+c2.real,c1.imag+c2.imag);} Complex operator-(const Complex &c1,const Complex &c2){    return Complex(c1.real-c2.real,c1.imag-c2.imag);} Complex operator*(const Complex &c1,const Complex &c2){    return Complex(c1.real*c2.real,c1.imag*c2.imag);} Complex operator/(const Complex &c1,const Complex &c2){    return Complex(c1.real/c2.real,c1.imag/c2.imag);}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;    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();    cout<<endl;    c3=c1+4;    cout<<"验证1："<<"c1+4=";    c3.display();    c3=5+c1;    cout<<"验证2："<<"5+c1=";    c3.display();    return 0;}

运行结果：

知识点总结：

注意！complex+double 与double+complex 不同！！！

学习心得：

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