项目1-实现复数类中的运算符重载(3)

/*copyright(c)2016.烟台大学计算机学院
 * All rights reserved,
 * 文件名称：text.Cpp
 * 作者：舒文超
 * 完成日期：2016年5月12日
 * 版本号：vc++6.0
 *
 * 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。
 */
#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+(double d, Complex &c2);
    friend Complex operator+(Complex &c1, double d);
    friend Complex operator-(Complex &c1, Complex &c2);
    friend Complex operator-(double d, Complex &c2);
    friend Complex operator-(Complex &c1, double d);
    friend Complex operator*(Complex &c1, Complex &c2);
    friend Complex operator*(double d, Complex &c2);
    friend Complex operator*(Complex &c1, double d);
    friend Complex operator/(Complex &c1, Complex &c2);
    friend Complex operator/(double d, Complex &c2);
    friend Complex operator/(Complex &c1, double d);
    void display();
private:
    double real;
    double imag;
};
Complex operator+(Complex &c1, Complex &c2)
{
    Complex c3;
    c3.real=c1.real+c2.real;
    c3.imag=c1.imag+c2.imag;
    return c3;
}
Complex operator+(double d, Complex &c2)
{
    Complex c(d,0);
    return c+c2;
}
Complex operator+(Complex &c1, double d)
{
    Complex c(d,0);
    return c1+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-(double d,Complex &c2)
{
    Complex c(d,0);
    return c-c2;
}
Complex operator-(Complex &c1, double d)
{
    Complex c(d,0);
    return c1-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*(double d, Complex &c2)
{
    Complex c(d,0);
    return c*c2;
}
Complex operator*(Complex &c1, double d)
{
    Complex c(d,0);
    return c1*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/(double d, Complex &c2)
{
    Complex c(d,0);
    return c/c2;
}
Complex operator/(Complex &c1, double d)
{
    Complex c(d,0);
    return c1/c;
}

void Complex::display()
{
    cout<<"("<<real<<","<<imag<<"i)"<<endl;
}

int main()
{
    Complex c1(3,4),c2(5,-10),c3;
    double d;
    cout<<"c1=";
    c1.display();
    cout<<"c2=";
    c2.display();
    cout<<"请输入要加的实数"<<endl;
    cin>>d;
    cout<<"d="<<d<<endl<<endl;
    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();
    c3=c1/c2;
    cout<<"c1/c2=";
    c3.display();
    cout<<"c1/d=";
    (c1/d).display();
    cout<<"d/c1=";
    (d/c1).display();
    return 0;
}