From: Robert Klemme <bob.news@...>
Date: 2005-02-16T07:09:52+09:00
Subject: Re: evaluation order


"Bertram Scharpf" <lists@bertram-scharpf.de> schrieb im Newsbeitrag 
news:20050213171916.GA31424@homer.bertram-scharpf...
> Hi,
>
> Am Montag, 14. Feb 2005, 01:39:57 +0900 schrieb Robert Klemme:
>> while ( line = gets ) ...
>>
>> Typically, you would need two assignments which is somewhat ugly:
>>
>> line = gets
>> while line
>> ....
>>  line = gets
>> end
>
> There is
>
>  while gets
>    line = $_.chomp
>    ...
>  end
>
> Bertram

That's a special case that works only because gets() does not only return 
the value but assigns it to $_ as a side effect.  In the general case you 
need two assignments unless you put it into the while condition.

Kind regards

    robert