项目1-3 定义一个定义完整的类。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; d

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/*
*Copyright (c) 2016,烟台大学计算机学院
*All rights reserved.
*文件名称：main.cpp
*作者：李磊涛
*完成时间：2016年5月22日
*版本号：v1.0
*
*问题描述：项目1-3 定义一个定义完整的类。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; d。
*输入描述：无。
*程序输出：两个数的算法公式及结果。
*/
#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 b, Complex &c2);
friend Complex operator+(Complex &c1,double b);
friend Complex operator-(Complex &c1, Complex &c2);
friend Complex operator-(double b, Complex &c2);
friend Complex operator-(Complex &c1,double b);
friend Complex operator*(Complex &c1, Complex &c2);
friend Complex operator*(double b, Complex &c2);
friend Complex operator*(Complex &c1,double b);
friend Complex operator/(Complex &c1, Complex &c2);
friend Complex operator/(double b, Complex &c2);
friend Complex operator/(Complex &c1,double b);
void display();
private:
double real;
double imag;
};

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 b, Complex &c2)
{
Complex c;
c.real=b+c2.real;
c.imag=0+c2.imag;
return c;
}
Complex operator+(Complex &c1,double b)
{
Complex c;
c.real=c1.real+b;
c.imag=c1.imag+0;
return 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 b, Complex &c2)
{
Complex c(b,0);

return c-c2;
}
Complex operator-(Complex &c1,double b)
{
Complex c(b,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 b, Complex &c2)
{
Complex c(b,0);

return c*c2;
}
Complex operator*(Complex &c1,double b)
{
Complex c(b,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 b, Complex &c2)
{
Complex c(b,0);

return c/c2;
}
Complex operator/(Complex &c1,double b)
{
Complex c(b,0);

return c1/c;
}
void Complex::display()
{
cout<<"("<<real<<","<<imag<<"i)"<<endl;
}

int main()
{
Complex c1(3,4),c2(5,-10),c3;
double d=11;
cout<<"c1=";
c1.display();
cout<<"c2=";
c2.display();
cout<<"d="<<d<<endl<<endl;
cout<<"下面是重载运算符的计算结果: "<<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;
}

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