sort num and values

sortpairs.rb

#!/usr/bin/env ruby
# -*- coding: utf-8 -*-

=begin
if input is below...
>>>
AAAA
30.3
BBBB
502.0
CCCC
40.8
DDDD
3.1
EEEE
80.2
FFF
22.0
GGG
30.4
HHH
30.2
<<<

the output will be...
>>>
3.1 DDDD
22.0 FFF
30.2 HHH
30.3 AAAA
30.4 GGG
40.8 CCCC
80.2 EEEE
502.0 BBBB
<<<
=end

nums  = [] #initialize array
pairs = {} #initialize hash

i = 1
while line = STDIN.gets

  if line =~ /^$/ then
    break
  end

  if i % 2 == 1 then
    str = line
  else
    num = line

    #contain values
    nums << num.to_f
    pairs.store(num.to_f.to_s.chomp, str.chomp)

  end

  i += 1
end

nums.sort!

nums.each do |n|

  puts "#{n} #{pairs[n.to_s]}"

end