// file line.hpp

class Point { 
 float x, y;
 public:
   void  SetCoords(float xx, float yy);
   float GetCoordX();
   float GetCoordY();
};

class Line {
 Point A, B;
 float dx, dy;
 public:
   void  SetExtremes(float ax, float ay, float bx, float by);
   float GetLength();
};

// end of file line.hpp