From: Brian Candler <b.candler@...>
Date: 2010-10-09T20:24:55+09:00
Subject: Re: how do i add  an instance variable to a class in Ruby

Amit Tomar wrote:
> i didn't get any error meassage but in class2.rb i tried to print @a 
> value using puts "#{@a}" .but got the blank o/p

brian@zino:~$ cat class1.rb
module Person
  class Amit
    def initialize
      @a=10
    end
  end
end
brian@zino:~$ cat class2.rb
module Person
  class Sumit < Amit
    def aos
      puts "#{@a}"
    end
  end
end
brian@zino:~$ cat run.rb
require 'class1'
require 'class2'
me = Person::Sumit.new
me.aos
brian@zino:~$ ruby run.rb
10
brian@zino:~$

So it works perfectly for me. So you need to work out what's different 
for you.

I'm running under Ubuntu Lucid x86, with this ruby version:

brian@zino:~$ ruby -v
ruby 1.8.7 (2010-01-10 patchlevel 249) [x86_64-linux]

But this is such a simple piece of code that it should run the same 
anywhere. So I imagine your code is different. Directly copy-paste the 
*exact* code you are running. Directly copy-paste *exactly* what you see 
when you run it.

Sometimes it's useful to run ruby with -w flag: i.e.

ruby -w run.rb
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