第十二周上机实践——项目1-实现复数类中的运算符重载-（3）

/*
*Copyright (c)2016,烟台大学计算机与控制工程学院
*All rights reserved.
*文件名称：main.cpp
*作    者：郭永恒
*完成日期：2016年5月18日
*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。
*/

#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 &c, const double d);
friend Complex operator-(const Complex &c, const double d);
friend Complex operator*(const Complex &c, const double d);
friend Complex operator/(const Complex &c, const double d);

friend Complex operator+(const double d, const Complex &c);
friend Complex operator-(const double d, const Complex &c);
friend Complex operator*(const double d, const Complex &c);
friend Complex operator/(const double d, const Complex &c);
void display();
private:
double real;
double imag;
};

Complex operator+(const double d, const Complex &c)
{
Complex temp;
temp = c;
temp.real += d;
return temp;
}
Complex operator-(const double d, const Complex &c)
{
Complex temp;
temp.real = d - c.real;
temp.imag = -c.imag;
return temp;
}
Complex operator*(const double d, const Complex &c)
{
Complex temp;
temp.real = c.real * d;
temp.imag = c.imag * d;
return temp;
}
Complex operator/(const double d, const Complex &c)/*****/
{
Complex temp;
temp.real = (d * c.real) / (c.real * c.real + c.imag * c.imag);
temp.imag = (-d * c.imag)/ (c.real * c.real + c.imag * c.imag);
return temp;
}

Complex operator+(const Complex &c, const double d)
{
Complex temp;
temp = c;
temp.real += d;
return temp;
}
Complex operator-(const Complex &c, const double d)
{
Complex temp;
temp = c;
temp.real -= d;
return temp;
}

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

Complex operator/(const Complex &c, const double d)/******/
{
Complex temp;
temp.real = c.real / d;
temp.imag = c.imag / d;
return temp;
}
Complex operator+(const Complex &c1, const Complex &c2)
{
Complex temp;
temp.real = c1.real + c2.real;
temp.imag = c1.imag + c2.imag;
return temp;
}

Complex operator-(const Complex &c1, const Complex &c2)
{
Complex temp;
temp.real = c1.real - c2.real;
temp.imag = c1.imag - c2.imag;
return temp;
}

Complex operator*(const Complex &c1, const Complex &c2)
{
Complex temp;
temp.real = c1.real*c2.real - c1.imag*c2.imag;
temp.imag = c1.imag*c2.real + c1.real*c2.imag;
return temp;
}

Complex operator/(const Complex &c1, const Complex &c2)
{
Complex temp;
temp.real = (c1.real*c2.real + c1.imag*c2.imag)/(c2.real*c2.real + c2.imag*c2.imag);
temp.imag = (c1.imag*c2.real - c1.real*c2.imag)/(c2.real*c2.real + c2.imag*c2.imag);
return temp;
}

void Complex::display()
{
cout << real;
if(imag > 0)
cout << "+" << imag << "i" << endl;
if(imag < 0)
cout << imag << "i" << endl;
}

//int main()
//{
//    Complex c1(3,4),c2(5,-10),c3;
//    cout << "c1=";
//    c1.display();
//    cout << "c2=";
//    c2.display();
//    c3 = c1+c2;
//    cout << "c1+c2=";
//    c3.display();
//    c3 = c1-c2;
//    cout << "c1-c2=";
//    c3.display();
//    c3 = c1*c2;
//    cout << "c1*c2=";
//    c3.display();
//    c3 = c1/c2;
//    cout << "c1/c2=";
//    c3.display();
//}
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;
}