shape.h

经典的<<C how to program>一书第三版的例程。非常适合于C的初学者。

// 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;
};

#endif



/**************************************************************************
 * (C) Copyright 2000 by Deitel & Associates, Inc. and Prentice Hall.     *
 * All Rights Reserved.                                                   *
 *                                                                        *
 * DISCLAIMER: The authors and publisher of this book have used their     *
 * best efforts in preparing the book. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these books. The authors *
 * and publisher shall not be liable in any event for incidental or       *
 * consequential damages in connection with, or arising out of, the       *
 * furnishing, performance, or use of these programs.                     *
 *************************************************************************/