第八周 任务一

/* 
实验内容:实现复数类中的运算符重载定义一个复数类重载运算符+、-、*、/，使之能用于复数的加减乘除。 
* 程序的版权和版本声明部分  
* Copyright (c) 2011, 烟台大学计算机学院学生  
* All rights reserved.  
* 文件名称： 实现复数类中的运算符重载                             
* 作    者：  薛广晨                             
* 完成日期：  2012       年  4    月  7      日  
* 版 本号：  x1.0         
  
* 对任务及求解方法的描述部分  
* 输入描述：

* 程序头部的注释结束（此处也删除了斜杠）  
*/
/*【任务1】实现复数类中的运算符重载定义一个复数类重载运算符+、-、*、/，使之能用于复数的加减乘除。
（2）方案二：请用类的友元函数，而不是成员函数，完成上面提及的运算符的重载；
（3）方案三：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运算的结果（其中?为+、-、*、/之一）。另外，定义一目运算符-，-c相当于0-c。；*/
#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+ (const double &d, Complex &c);
    friend Complex operator+ (Complex &c, const double &d);

	friend Complex operator- (Complex &c1, Complex &c2);
    friend Complex operator- (const double &d, Complex &c);
    friend Complex operator- (Complex &c, const double &d);

	friend Complex operator- (Complex &c);

	friend Complex operator* (Complex &c1, Complex &c2);
    friend Complex operator* (const double &d, Complex &c);
    friend Complex operator* (Complex &c, const double &d);

	friend Complex operator/ (Complex &c1, Complex &c2);
    friend Complex operator/ (const double &d, Complex &c);
    friend Complex operator/ (Complex &c, const double &d);

	void display();
private:
	double real;
	double imag;
};
//下面定义成员函数
void Complex :: display( )    
{  
    cout<<"("<<real<<","<<imag<<"i)"<<endl;  
}  

Complex operator + (Complex &c1, Complex &c2)
{return Complex(c1.real + c2.real, c1.imag + c2.imag);}

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

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

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

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

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

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

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

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

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

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

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

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

int main()
{
	const double d = 2;
	Complex c1(3,4),c2(5,-10),c3,c4;
	cout << "c1=";
	c1.display();

	cout << "c2=";
	c2.display();

	c3 = c1 + c2;
	cout << "c1+c2=";
	c3.display();

	c3 = c1 + 2;
	cout << "c1+2=";
	c3.display();

	c3 = 2 + c1;
	cout << "2+c1=";
	c3.display();

	c3 = c1 - c2;
	cout << "c1-c2=";
	c3.display();

	c3 = c1 - 2;
	cout << "c1-2=";
	c3.display();

	c3 = 2 - c1;
	cout << "2-c1=";
	c3.display();

	c3 = c1 * c2;
	cout << "c1*c2=";
	c3.display();

	c3 = c1 * 2;
	cout << "c1*2=";
	c3.display();

	c3 = 2 * c1;
	cout << "2*c1=";
	c3.display();

	c3 = c1 / c2;
	cout << "c1/c2=";
	c3.display();

	c3 = c1 / 2;
	cout << "c1/2=";
	c3.display();

	c3 = 2 / c1;
	cout << "2/c1=";
	c3.display();

	c3 = - c1;
	cout << "-c1=";
	c3.display();

	system("pause");
	return 0;
}
           

上机感言：这个更加完善，能实现更多的功能