第八週實驗報告1-2

2）方案二：請用類的友元函數，而不是成員函數，完成上面提及的運算符的重載；

 

 

#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 & , Complex &);
	friend Complex operator-(Complex & , Complex &);
	friend Complex operator*(Complex & , Complex &);
	friend Complex operator/(Complex & , Complex &);
	void display();
private:
	double real;
	double imag;
};
//下面定義成員函數
Complex operator+(Complex &c2 , Complex &c3)
{
	Complex c1;
	c1.real =c2.real+c3.real ;
	c1.imag =c2.imag+c3.imag ;
	return c1;
}

Complex operator-(Complex &c2 , Complex &c3)
{
	Complex c1;
	c1.real =c2.real-c3.real ;
	c1.imag =c2.imag-c3.imag ;
	return c1;
}

Complex operator*(Complex &c2 , Complex &c3)
{
	Complex c1;
	c1.real =c2.real*c3.real - c2.imag * c3.imag  ;
	c1.imag =c2.real*c3.imag + c2.imag * c3.real ;
	return c1;
}

Complex operator/(Complex &c2 , Complex &c3)
{
	Complex c1;
	c1.real = (c2.real*c3.real + c2.imag * c3.imag ) / ( c3.real * c3.real + c3.imag * c3.imag ) ;
	c1.imag =(c2.imag* c3.real  - c2.real * c3.imag ) / ( c3.real * c3.real + c3.imag * c3.imag ) ;
	return c1;
}

void Complex::display()
{
	cout << "(" << real << "," <<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();
	system("pause");
	return 0;
}