#include <iostream>
#include <stdio.h>

using namespace std;

/*
 * main - demonstrates comments, identifiers, keywords, data types, 
 */
int main()
{
  const double PI = 3.14159;
  double radius;

  // computes the volume of a sphere given the radius
  cout << "Enter the radius of the sphere: ";
  cin >> radius;

  // Calculate volume and print result
  double volume = 4 * PI * radius * radius * radius / 3;
  cout << "The volume of the sphere of radius " << radius
       << " inches is " << volume << " cubic inches.\n";

  // C-style printing
  printf("The volume of the sphere of radius %lf inches is %lf cubic inches.\n",
	 radius, volume);

  return 0;
}