/*class GBaseShape {
	public:
    GBaseShape();
virtual void  EvalVolume();
virtual void  EvalSurface();
double GetVolume() const;
double GetVolume() const;

	private:
    double Volume, Surface;
    bool IfVolumeCalculated;
    bool IfSurfaceCalculated;
};
*/




class Cube {
  public:
      explicit 	Cube(double _L = 0, double _W = 0, double _H = 0);
 //     void SetAll();
      void SetL(double _L);
//      void SetB(double _B);
//      void SetC(double _C);

      double GetA() const;
  private:
      double L,W,H;
}


Cube::Cube(double _L = 0, double _W = 0, double _H = 0){
   SetL(_L); 
}