rational.rb -
    $Release Version: 0.5 $
    $Revision: 1.7 $
    $Date: 1999/08/24 12:49:28 $
    by Keiju ISHITSUKA(SHL Japan Inc.)
Documentation by Kevin Jackson and Gavin Sinclair.
When you require 'rational', all interactions between numbers potentially return a rational result.  For example:
1.quo(2)              # -> 0.5
require 'rational'
1.quo(2)              # -> Rational(1,2)
See Rational for full documentation.