复数与实数的相加

/*
*Copyright (c) 2013, 烟台大学计算机学院
* All rights reserved.
* 作    者：马广明
* 完成日期：2014 年 4 月 15 日
* 版 本 号：v1.0
* 问题描述：完整实现复数类中的运算符重载
*/
#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,double d);
    friend Complex operator-(Complex &c1,double d);
    friend Complex operator*(Complex &c1,double d);
    friend Complex operator/(Complex &c1,double d);
    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);
    void display();
private:
    double real;
    double imag;
};
//计算c+d；
 Complex operator+(Complex &c1,double d)
{
    return Complex((c1.real)+d,c1.imag);
}
Complex operator+(double d,Complex &c1)
{
    return Complex(d+c1.real,c1.imag);
}
Complex operator-(Complex &c1,double d)
{
    return Complex((c1.real)-d,c1.imag);
}
Complex operator-(double d,Complex &c1)
{
    return Complex(d-c1.real,c1.imag);
}
Complex operator*(Complex &c1,double d)
{
    return Complex((c1.real)*d,c1.imag);
}
Complex operator*(double d,Complex &c1)
{
    return Complex(d*c1.real,c1.imag);
}
Complex operator/(Complex &c1,double d)
{
    return Complex((c1.real)/d,c1.imag);
}
Complex operator/(double d,Complex &c1)
{
    return Complex(d/c1.real,c1.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(3,6),c3;
    double d=3;
    c3=c1+d;
    cout<<"c1+d=";
    c3.display();
    c3=d-c1;
    cout<<"d-c1=";
    c3.display();
    c3=d*c1;
    cout<<"d*c1=";
    c3.display();
    c3=c1/d;
    cout<<"c1/d=";
    c3.display();
    return 0;
}