#ifndef XYPOINT
#define XYPOINT
#include <iostream>
using namespace std;

class XYPoint {
  public:  XYPoint(void);
           XYPoint(double x, double y);
           double x(void)   const { return _x; }
           double y(void)   const { return _y; }
           int num(void) const { return _num; }
           void setX(double x) { _x = x; }
           void setY(double y) { _y = y; }
           double distance(const XYPoint *other) const;
           bool isLeftOf(const XYPoint *other) const;
           bool isBelow(const XYPoint *other) const;
  private: double _x;
           double _y;
           int _num;
};

// functions to print points
ostream& operator <<(ostream&, const XYPoint &);  //  given a point
ostream& operator <<(ostream&, const XYPoint *);  //  given a ref to a point
#endif