// Fig. 20.1: shape.h
// Definition of abstract base class Shape
#ifndef SHAPE_H
#define SHAPE_H

class Shape {
public:
   virtual double area() const { return 0.0; }
   virtual double volume() const { return 0.0; }

   // pure virtual functions overridden in derived classes
   virtual void printShapeName() const = 0;
   virtual void print() const = 0;
}; // end class Shape

#endif



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