sphere.h

Data Abstraction & Problem Solving with C++源码

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

   Sphere(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誷 radius is newRadius.

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

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

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

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

   double getVolume() 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誷 radius
};  // end class
// End of header file.