ex_complex.cpp

虽然是一个小小的例子,却是基本上包括了C++多态的含义!是很好的学习材料

#include<iostream.h>
class CComplex
{
public:
	CComplex(double r=0,double i=0)
	{   realPart=r;  imagePart=i;	}
	void print()
	{   cout<<"该复数实部="<<realPart<<",虚部="<<imagePart<<endl;	}
	CComplex operator+(CComplex &c);
	CComplex operator+(double r);
	void operator-();
	void operator++();
	friend CComplex operator+(double r,CComplex &c);
private:
	double realPart;
	double imagePart;
};
CComplex CComplex::operator+(CComplex &c)
{
	CComplex temp;
	temp.realPart=realPart+c.realPart;
	temp.imagePart=imagePart+c.imagePart;
	return temp;
}
CComplex CComplex::operator +(double r)
{
	CComplex temp;
	temp.realPart=realPart+r;
	temp.imagePart=imagePart;
	return temp;
}
void CComplex::operator -()
{
	realPart=-realPart;
	imagePart=-imagePart;
}
void CComplex::operator ++()
{
	realPart++;
	imagePart++;
}
CComplex operator+(double r,CComplex &c)
{
	CComplex temp;
	temp.realPart=r+c.realPart;
	temp.imagePart=c.imagePart;
	return temp;
}
void main()
{
	CComplex c1(12,20),c2(50,70),c;
	c=c1+c2;
	c.print();
	++c;
	c.print();
	-c;
	c.print();
	c=c1+20;
	c.print();
	c=20+c1;
	c.print();
}