text: #ifndef STRUCTURE3D_H
  #define STRUCTURE3D_H
  
  #include "structure.h"
  
  class structure3D :
  	public structure
  {
  private:
  	/* Private Variables */
  	double length;
  	double volume;
  
  	/* Private Functions */
  	bool setDimen(double, double, double);
  	bool calcArea();
  	
  
  public:
  	/* Constructors */
  	structure3D();
  	structure3D(double, double, double);
  	
  	/* Destructor*/
  	~structure3D();
  
  	/* Public Functions */
  	double getArea();
  };
  
  #endif