From: mutahhir hayat <mutahhir.ali@...>
Date: 2008-03-19T15:59:03+09:00
Subject: Re: Undefined method '<' for nil:NilClasse

You have to initialize instance members inside the initialize
function, or another function that's called after instantiation.
That's why @kounter is nil. Try putting @kounter=0 inside #initialize

HTH
MT

On Wed, Mar 19, 2008 at 2:38 PM, Roberto Casadei
<robyonrails@katamail.com> wrote:
> This is the code:
>  class StringScanner
>   @str = ""
>   @kounter = 0
>   def initialize(str)
>     @str = str
>   end
>   def scan(arg)
>     res = @str.scan(arg)
>     return nil unless @kounter<res.length
>     @kounter=@kounter+1
>     res[@kounter-1]
>   end
>  end
>
>  str = "Watch how I soar!"
>  ss = StringScanner.new(str)
>  loop do
>   word = ss.scan(/\w+/)    # Grab a word at a time
>   break if word.nil?
>   puts word
>   sep = ss.scan(/\W+/)     # Grab next non-word piece
>   break if sep.nil?
>  end
>
>  And this is the result:
>  C:/Documents and Settings/Roby/Desktop/Apps/Ruby/prova2.rb:9:in `scan':
>  undefined method `<' for nil:NilClass (NoMethodError)
>         from C:/Documents and
>  Settings/Roby/Desktop/Apps/Ruby/prova2.rb:18
>         from C:/Documents and
>  Settings/Roby/Desktop/Apps/Ruby/prova2.rb:17:in `loop'
>         from C:/Documents and
>  Settings/Roby/Desktop/Apps/Ruby/prova2.rb:17
>
>  Help.
>  --
>  Posted via http://www.ruby-forum.com/.
>
>