#---
# Excerpted from "Programming Ruby 3.2",
# published by The Pragmatic Bookshelf.
# Copyrights apply to this code. It may not be used to create training material,
# courses, books, articles, and the like. Contact us if you are in doubt.
# We make no guarantees that this code is fit for any purpose.
# Visit https://pragprog.com/titles/ruby6 for more book information.
#---
klass = Integer
print "Inheritance chain: "
begin
  print klass
  klass = klass.superclass
  print " < " if klass
end while klass
puts
p "Ancestors: #{Integer.ancestors}"
p "Subclasses: #{Integer.subclasses}"
