Sphere Surprize

The volume of a unit sphere
(a sphere with a radius of 1)
can be computed by:
// Volume of a sphere: in error!
   double radius, volume;
   radius = 1.0; // a unit sphere
   volume = (4 / 3) * 3.14159 * radius * radius * radius;
   System.out.println (volume);
This produces an error of over 25 percent!
Try it, and fix it!
Then take a peek at
a better volume