From: Marcin Raczkowski <mailing.mr@...>
Date: 2007-09-16T09:04:01+09:00
Subject: Re: if i don't use @n but use n instead, there is no error

kendear wrote:
> in an instance method, if i didn't use @n but used n, the program still
> runs...
> and it is not changing the global n... so what is it changing?
> 
> Example:
> 
> n = 10
> 
> class Foo
> 
>   def initialize(i)
>     @n = i
>   end
> 
>   def change()
>     puts
>     puts "Inside of change!!!!!!!!!!!!!!!!"
>     n = 111111            # intentionally not using @n
>   end
> 
>   def print_it
>     puts
>     p "Printing Object"
>     p @n
>   end
> 
> end
> 
> 
> 
> foo = Foo.new(3)
> foo.print_it
> 
> foo.change
> foo.print_it
> 
> 
> puts
> p "Global var"
> p n
>  -------- output ----------------------------------------------------------
> 
> C:\rails\depot>ruby test_class01.rb
> 
> "Printing Object"
> 3
> 
> Inside of change!!!!!!!!!!!!!!!!
> 
> "Printing Object"
> 3
> 
> "Global var"
> 10
> 

well if oyou would like global n you should use $n, for me this kode 
looks good and proper, change method changes local variable n, not 
global one