From: Adam Groves <adam.groves@...>
Date: 2006-03-01T22:12:08+09:00
Subject: Indexing system - ruby newbie

Hi there,

I'm trying to write a class which converts a number into letters like 
so:
0  => -
1  => A
10 => J
27 => AA


... ad infinitum. My class looks like this at the moment (please don't 
laugh!)

def letter(number)
  @index = number - 1
  if @index == 0
    return "-"
  end
  @index_string = ""
  @index_array= []
  while @index > 0 do
    @remainder = @index%27
    @index_array << @remainder
    @index = @index/27
  end
  @index_array
  @index_array.each do |i|
  # I'm sure there's a better way to do this
   @alphabet = 
["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"]
    @index_string << @alphabet[i-1]
  end
  return @index_string.reverse!
end

This works fine for the first round: 26 returns "Z". But 27 returns "AZ" 
because @index_array is [0,1]. I'd appreciate any help (and tips on how 
to write tighter code!)


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