// ****************************************************
// Header file sphereClass.h for the class sphereClass.
// ****************************************************
#ifndef sphereClass_h       /* To prevent multiple inclusion problems */
#define sphereClass_h

const double PI = 3.14159;
class sphereClass
{
public:
	sphereClass();
	// Default constructor: Creates a sphere and
	// initializes its radius to a default value.
	// Precondition: None.
	// Postcondition: A sphere of radius 1 exists.

	sphereClass(double initialRadius);
	// Constructor: Creates a sphere and initializes
	// its radius.
	// Precondition: initialRadius is the desired
	// radius.
	// Postcondition: A sphere of radius initialRadius
	// exists.

	void SetRadius(double newRadius);
	// Sets (alters) the radius of an existing sphere.
	// Precondition: newRadius is the desired radius.
	// Postcondition: The sphere's radius is newRadius.

	double Radius() const;
	// Determines a sphere's radius.
	// Precondition: None.
	// Postcondition: Returns the radius.

	double Diameter() const;
	// Determines a sphere's diameter.
	// Precondition: None.
	// Postcondition: Returns the diameter.

	double Circumference() const;
	// Determines a sphere's circumference.
	// Precondition: PI is a named constant.
	// Postcondition: Returns the circumference.

	double Area() const;
	// Determines a sphere's surface area.
	// Precondition: PI is a named constant.
	// Postcondition: Returns the surface area.

	double Volume() const;
	// Determines a sphere's volume.
	// Precondition: PI is a named constant.
	// Postcondition: Returns the volume.

	void DisplayStatistics() const;
	// Displays statistics of a sphere.
	// Precondition: None.
	// Postcondition: Displays the radius, diameter,
	// circumference, area, and volume.

private:
	double theRadius;  // the sphere's radius
};  // end class

#endif