From: Gavin Sinclair <gsinclair@...>
Date: 2003-01-30T13:27:58+09:00
Subject: Re: A simple program but strange output

On Thursday, January 30, 2003, 3:13:43 PM, Maggie wrote:

> Hi there,

> I wrote a simple program to enumerate an array. The code is as below:
> class Test
>  def initialize
>    @x=[0,1,2]
>    @tem=@x
>    @y=@x
>    y=del(@tem)
>  printf "#{@x}\n"
>  printf "#{@y}\n"
>           end
>   def del(x)
>  x.delete_at(0)
>  return x
>  end
> end
> a=Test.new

> But the output is :
> 12
> 12
> Why  @x and @y are changed? Is there anyone can tell me how to deal with
> this problem?

@x, @y, and @tem are all the same object, viewed through different
variables.  Since you use printf, I presume you know C.  They are like
pointers.

BTW printf "#{@x}\n"    ==   puts @x

Gavin