#!/usr/bin/env ruby
# Copyright 2005 Daniel Cer (daniel.cer@cs.colorado.edu)
#
# This work is licensed under the Creative Commons Attribution-NonCommercial-
# ShareAlike License. To view a copy of this license, visit 
# http://creativecommons.org/licenses/by-nc-sa/2.5/ or send a letter to 
# Creative Commons, 543 Howard Street, 5th Floor, San Francisco, California, 
# 94105, USA.

# bubble_sort - sort, in place, the list given by 'entries'
# As a convenience, the list 'entries' is also returned by this function
def bubble_sort(entries)
  (entries.length-1).downto(1) do |i| i.times do |j|
    if entries[j+1] < entries[j]
      entries[j+1],entries[j]=entries[j],entries[j+1]
    end
  end end; entries
end

if ARGV.length != 1
  $stderr.puts "Usage:\n\t#{$0} (file with numbers to sort)"
  exit -1
end

# read in the entries
entries = Array.new
IO.foreach(ARGV[0]) { |line| entries.push Float(line) }

# sort them
bubble_sort(entries)

# display the results
entries.each { |line| puts line }