/*--------------------- Planet.cc: Planet class ----------------------
  class Planet models a few features of planets.
  (Clearly this is an extreme simplification of astronomy; the idea
  is to illustrate how C++ can model a class of objects.)
  Class declaration is in planet.h, test driver in planetst.cc.
  Programmer: John Chapman
  For chapter 16 of "The Universal Machine" (multimedia)
  Copyright (C) McGraw-Hill/Primus, 2003
--------------------------------------------------------------------*/
#include <iostream.h>
#include <iomanip.h>
#include <stdio.h>
#include <math.h>
//#include "Planet.h"
/*--------------------- Planet.h: Planet class ----------------------
  class Planet models a few features of planets.
  (Clearly this is an extreme simplification of astronomy; the idea
  is to illustrate how C++ can model a class of objects.)
  Implementation of constructor and member functions is in planet.cc.
  Test driver for this class is in planetst.cc.
  Programmer: John Chapman
  For chapter 14 of "The Universal Machine" (multimedia)
  Copyright (C) WCB/McGraw-Hill, 1998
--------------------------------------------------------------------*/

class Planet{
  public:
    Planet(float rad);       //constructor
    float volume();          //public member functions
    float surface_area();
  private:                   
    float radius;	     //private data member
};

//Class::Constructor(parameters)
Planet::Planet(float rad)  //constructor
{
  radius = rad; //initialize data member radius
}

//returnType Class::functionName()
float Planet::volume()
{
  float vol;
  vol = 4/3*PI*pow(radius,3); //compute the volume
  return vol;
}

float Planet::surface_area()
{
  float area;
  area = 4*PI*pow(radius,2); //compute the surface area.
  return area;
}

/*------------------ planetst.cc: test Planet class ------------------
  Test driver for the Planet class
  Class declaration is in planet.h, implementation in planet.cc.
  Programmer: John Chapman
  For chapter 14 of "The Universal Machine" (multimedia)
  Copyright (C) WCB/McGraw-Hill, 1998
--------------------------------------------------------------------*/
void main()
{
  Planet Knobby(45.0); //Suppose Knobby were a Planet
  cout << "The volume of this planet is: " << Knobby.volume() << endl;
  cout << "The surface area of this planet is: " 
       << Knobby.surface_area() << endl;
  cout << "Enter a number to quit:";
  int in; cin >> in;  //wait for input
}