class sphereClass
{
public:
// constructors:
   sphereClass();
   sphereClass(double InitialRadius);
   // copy constructor and destructor supplied
   // by the compiler

// sphere operations:
   void SetRadius(double NewRadius);
   double Radius() const;
   double Diameter() const;
   double Circumference() const;
   double Area() const;
   double Volume() const;
   void DisplayStatistics() const; 

private:
   double TheRadius;  // the sphereÕs radius
};  // end class