point2.cpp

用三个类来研究类的继承！类Point、Circle、Cylinder

//point2.cpp
//类Point的成员函数定义

#include <iostream.h>
#include <assert.h>
#include "point2.h"

//构造函数
Point:: Point(float a, float b)
{
	x=a;
	y=b;
}

//设在x和y的坐标值
void Point:: setPoint(float a, float b)
{
	x=a;
	y=b;
}

//输出点的坐标
ostream &operator<< (ostream &output, const Point &p)
{
	output<<"["<<p.x<<", "<<p.y<<"]";

	return output;	//使得能够连续输出
}