A better volume

A better volume

In Java the term

   (4 / 3) 
   evaluates to the integer 1

so the volume evaluates to 3.14159 (or PI)
instead of the proper value 4.18878..
resulting in a huge error, and
providing no error message!
A better version is:

// Volume of a sphere: corrected
   double radius, volume;
   radius = 1.0; // a unit sphere
   volume = (4.0 / 3.0) * 3.14159 * radius * radius * radius;
   System.out.println (volume);

The main line can also be written as

   volume = (4.0 / 3.0) * Math.PI * radius * radius * radius;

or even

   volume = (4.0 / 3.0) * Math.PI * Math.pow (radius, 3.0);

Beware; Be Aware.