demo_operator_02_c.cpp

对于一个初涉VC＋＋的人来书

//************************************************
// 定义一个复数类,重载运算符"+,-,*,/"实现复数加,减,
// 乘,除运算. 运算符函数重载为类成员函数.
//************************************************

# include <iostream.h>

class Complex
{
public:
	Complex(){real=0;imag=0;}
    Complex(double r,double i){real=r;imag=i;}
    Complex operator+(Complex &c2);
    Complex operator-(Complex &c2);
    Complex operator*(Complex &c2);
    Complex operator/(Complex &c2);
    void display();
private:
    double real;
    double imag;
};
 
Complex Complex::operator+(Complex &c2)
{
	Complex c;
	c.real=real+c2.real;
	c.imag=imag+c2.imag;

	return c;
}
 
Complex Complex::operator-(Complex &c2)
{
	Complex c;
	c.real=real-c2.real;
	c.imag=imag-c2.imag;

	return c;
}

Complex Complex::operator*(Complex &c2)
{
	Complex c;
	c.real=real*c2.real-imag*c2.imag;
	c.imag=imag*c2.real+real*c2.imag;

	return c;
}

Complex Complex::operator/(Complex &c2)
{
	Complex c;
	c.real=(real*c2.real+imag*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);
	c.imag=(imag*c2.real-real*c2.imag)/(c2.real*c2.real+c2.imag*c2.imag);

	return c;
}

void Complex::display()
{
	cout<<"("<<real<<","<<imag<<"i)"<<endl;
}

int main()
{
	Complex c1(3,4),c2(5,-10),c3;

	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();

	return 0;
}