demo_operator_07_b.cpp

对于一个初涉VC＋＋的人来书

//************************************************
// 复数类的定义和使用
//************************************************

# include <iostream.h>

class Complex
{
public:
	Complex(double r=0,double i=0);
	Complex(const Complex & other);
	Complex operator + (const Complex & other);
	Complex operator - (const Complex & other);
	Complex operator - ();
	Complex operator = (const Complex & other);
	friend ostream & operator << (ostream & sream,Complex obj);
	friend istream & operator >> (istream & sream,Complex & obj);
protected:
	double real,image;
};

Complex::Complex(double r,double i)
{
	real=r;
	image=i;
	return;
}

Complex::Complex(const Complex & other)
{
	real=other.real;
	image=other.image;
	return;
}

Complex Complex::operator + (const Complex & other)
{
	Complex temp;

	temp.real=real+other.real;
	temp.image=image+other.image;
	return temp;
}

Complex Complex::operator - (const Complex & other)
{
	Complex temp;

	temp.real=real-other.real;
	temp.image=image-other.image;
	return temp;
}

Complex Complex::operator - ()
{
	Complex temp;

	temp.real=-real;
	temp.image=-image;
	return temp;
}

Complex Complex::operator = (const Complex & other)
{
	real=other.real;
	image=other.image;
	return *this;
}

ostream & operator << (ostream & stream,Complex obj)
{
	stream<<obj.real;
	if(obj.image>0) stream<<"+"<<obj.image<<"i";
	if(obj.image<0) stream<<obj.image<<"i";

	return stream;
}

istream & operator >> (istream & stream,Complex & obj)
{
	cout<<"Input real part:";
	stream>>obj.real;
	cout<<"Input image part:";
	stream>>obj.image;

	return stream;
}

int main()
{
	Complex c1,c2;

	cout<<"Input the first complex number c1:"<<endl;
	cin>>c1;
	cout<<"Input the second complex number c1:"<<endl;
	cin>>c2;

	cout<<"c1 is: "<<c1<<endl;
	cout<<"c2 is: "<<c2<<endl;

	cout<<"c1+c2 is: "<<c1+c2<<endl;
	cout<<"c1-c2 is: "<<c1-c2<<endl;

	return 0;
}