第六周

/*
* Copyright (c) 2014, 烟台大学计算机学院
* All rights reserved.
* 文件名称：test.cpp
* 作    者：张磊
* 版 本 号：v1.0
*
* 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。
* 程序输入：相应的程序
* 程序输出：对应得结果
*/

#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+(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);
friend Complex operator+(const Complex&c1,double b);
friend Complex operator+(double b,const Complex&c1);
friend Complex operator-(const Complex&c1,double b);
friend Complex operator-(double b,const Complex&c1);
friend Complex operator*(double b,const Complex&c1);
friend Complex operator*(const Complex&c1,double b);
friend Complex operator/(const Complex&c1,double b);
friend Complex operator/(double b,const Complex&c1);
void display();
private:
double real;
double imag;
};
Complex operator+(const Complex&c1,const Complex&c2)
{
Complex c;
c.real=c1.real+c2.real;
c.imag=c1.imag+c2.imag;
return c;
}
Complex operator+(const Complex&c1,double b)
{
Complex c;
c.real=c1.real+b;
c.imag=c1.imag;
return c;
}
Complex operator+(double b,const Complex&c1)
{
Complex c(b,0);//充分利用已定义好的代码，可以降低出错率，很聪明的选择
return c+c1;
}
Complex operator-(const Complex&c1,double b)
{
Complex c;
c.real=c1.real-b;
c.imag=c1.imag;
return c;
}
Complex operator-(const Complex&c1,const Complex&c2)
{
Complex c;
c.real=c1.real-c2.real;
c.imag=c1.imag-c2.imag;
return c;
}
Complex operator-(double b,const Complex&c1)
{
Complex c(b,0);
return c-c1;
}
Complex operator*(const Complex&c1,const Complex&c2)
{
Complex c;
c.real=c1.real*c2.real;
c.imag=c1.imag*c2.imag;
return c;
}
Complex operator*(const Complex&c1,double b)
{
Complex c;
c.real=c1.real*b;
c.imag=c1.imag;
return c;
}
Complex operator*(double b,const Complex&c1)
{
Complex c(b,1);
return c*c1;
}
Complex operator/(const Complex&c1,const 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/(const Complex&c1,double b)
{
Complex c;
c.real=c1.real/b;
c.imag=c1.imag;
return c;
}
Complex operator/(double b,const Complex&c1)
{
Complex c(b,0);
return c/c1;
}
void Complex::display()
{
cout<<"("<<real<<","<<imag<<"i"<<")"<<endl;
}
int main()
{
double b;
b=11;
Complex c1(3,4),c3;
cout<<"c1=";
c1.display();
cout<<"b="<<b<<endl;
cout<<"c1+b=";
c3=c1+b;
c3.display();
cout<<"b+c1=";
c3=b+c1;
c3.display();
cout<<"c1-b=";
c3=c1-b;
c3.display();
cout<<"b-c1=";
c3=b-c1;
c3.display();
c3=c1*b;
cout<<"c1*b=";
c3.display();
c3=b*c1;
cout<<"b*c1=";
c3.display();
c3=c1/b;
cout<<"c1/b=";
c3.display();
c3=b/c1;
cout<<"b/c1=";
c3.display();
return 0;
}