#include <iostream.h>
//using namespace std;
//聲明類Point
class Point
{public:
  Point(float=0,float=0);
  void setPoint(float,float);
  float getX() const {return x;}
  float getY() const {return y;}
  friend ostream & operator<<(ostream &,const Point &);
protected:
  float x,y;
};
//定義Point類的成員函數(shù)
//Point的構造函數(shù)
Point::Point(float a,float b)
{x=a;y=b;}
//設置x和y的坐標值
void Point::setPoint(float a,float b)
{x=a;y=b;}
//輸出點的坐標
ostream & operator<<(ostream &output,const Point &p)
{output<<"["<<p.x<<","<<p.y<<"]"<<endl;
 return output;
}
int main()
{Point p(3.5,6.4);
 cout<<"x="<<p.getX()<<",y="<<p.getY()<<endl;
 p.setPoint(8.5,6.8);
 cout<<"p(new):"<<p<<endl;
 return 0;
}