/*--------------------------------------------------------------------*/ 
/*  This program computes the volume of a sphere of radius r.         */ 
 
#include <iostream> 
using namespace std; 
 
const double PI = 3.141593; 
 
int main() 
{ 
   /*  Declare variables.  */ 
   double r, volume; 
 
   /*  Enter the radius of the sphere.  */ 
   cout << "Enter the radius of the sphere: "; 
   cin >> r; 
 
   /*  Compute the volume of the sphere.  */ 
   volume = (4.0/3.0)*PI*r*r*r; 
 
   /*  Print the value of the volume.  */ 
   cout << "The volume of a sphere with radius " << r 
        << " is " << volume << endl; 
 
   /*  Exit program.  */ 
   return 0; 
} 
/*--------------------------------------------------------------------*/