SPHERE.H

Member variables allocated for each instance of the class are initialized by creating a constructor function.
Member variables are automatically deleted when a class object is deleted.
However, any memory allocated dynamically by the class object must be deleted manually in a destructor function.
Both the constructor and the destructor are named after the class, while the destructor is preceded by a tilda.
Niether the class constructor nor the class destructor have a return type.

class sphere 
	{
	public:
	sphere(void) { resetPosition(); diameter = 0.0; }
	~sphere(void) {}
	void setRadius(float value) { diameter = value*2.0; }
	float getRadius(void) { return diameter/2.0; }
	protected:
	float xPosition;
	float yPosition;
	float zPosition;
	private:
	void resetPosition(void) { xPosition = 0.0; yPosition = 0.0; zPosition = 0.0; }
	float diameter;
	};