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）

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2
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);
}
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：