第八週作業1

#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);//聲明operator+爲Complex友元函數
    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;
};
//下面定義成員函數
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;
}