第二学期第九周项目1--实现复数类中的运算符重载（复数与浮点数）

/*
* Copyright (c) 2013, 烟台大学计算机学院
* All rights reserved.
* 作    者：  沈远宏
* 完成日期：2013 年 04月15日
* 版 本 号：v1.0
* 问题描述：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”，这样的类在方案二的基础上，
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。
* 输出：两个复数+，-，*，/后的结果输出
*/
#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);
friend Complex operator+( Complex &c,double &d);
friend Complex operator+(double &d,Complex &c);
friend Complex operator-(double &d,Complex &c);
friend Complex operator-(Complex &c,double &d);
friend Complex operator*(Complex &c, double &d);
friend Complex operator*( double &d,Complex &c);
friend Complex operator/(Complex &c,double &d);
friend Complex operator/( double &d,Complex &c);
void input();
void display();
private:
double real;
char p,i;
double imag;
};
//下面定义成员函数
Complex operator-(Complex &c1)
{
return Complex(-c1.real,-c1.imag);
}
Complex operator+(Complex &c, double  &d)//+
{
return Complex(d+c.real,c.imag);
}

Complex operator+(  double&d,Complex &c)
{
return Complex(d+c.real,c.imag);
}

Complex operator-(Complex &c ,double &d)//-
{
return Complex(d-c.real,c.imag);
}

Complex operator-(  double&d,Complex &c)
{
return Complex(d-c.real,c.imag);
}

Complex operator*(Complex &c,  double &d)//*
{
return Complex(d*c.real,c.imag);
}

Complex operator*(  double&d,Complex &c)
{
return Complex(d*c.real,c.imag);
}

Complex operator/(Complex &c, double &d)// /
{
return Complex(d/c.real,c.imag);
}

Complex operator/(  double&d,Complex &c)
{
return Complex(c.real/d,c.imag);
}
void Complex::display()
{
if(imag>0)
{
p='+';
}
else
{
p='-';
imag=-imag;
}
cout<<real<<p<<imag<<"i\n";
}
void Complex::input()
{
cin>>real>>p>>imag>>i;
}
//下面定义用于测试的main()函数
int main()
{
Complex c1,c3;
double d;
cout<<"请输入1个复数：\n";
c1.input();
cout<<"请输入一个浮点数：\n";
cin>>d;
c3=c1+d;
cout<<"c1+d=";
c3.display();
c3=c1-d;
cout<<"c1-d=";
c3.display();
c3=c1*d;
cout<<"c1*d=";
c3.display();
c3=c1/d;
cout<<"c1/d=";
c3.display();
c3=-c3;
cout<<"-(c1/d)=";
c3.display();
cout<<"d+c1=";
c3.display();
c3=d-c1;
cout<<"d-c1=";
c3.display();
c3=d*c1;
cout<<"d*c1=";
c3.display();
c3=d/c1;
cout<<"d/c1=";
c3.display();
c3=-c1;
cout<<"-c1=";
c3.display();
return 0;
}