Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

A co-worker in my shop is starting to appreciate the smell of Perl. We had a discussion about recursive function calls in general and he went off writing a small test script to get familiar with the concept.

I told him to use strict and warnings or die. He didn't want to die just yet, so he obeyed. Then he came to me asking for an explanation to something I hadn't foreseen:

#!/usr/bin/perl -w use strict; my $line; open (IN, "<david2"); open (OUT, ">temp"); while ($line = <IN>) { process($line); } exit; sub process { my $str=shift; # my $rest; ($a, $b, $rest) = split(/\s+/,$str,3); if (defined($a)){ print OUT "$a\t"; } if (defined($b)){ print OUT "$b\n"; } if (!defined($rest)){ return (0); } process($rest); }
If he runs the above script, perl will complain that $rest requires explicit package name etc. Fine. Removing the comment before my $rest will make perl happy. Fine again.

The question is: Why doesn't perl require explicit package names for $a and $b?

We have tried the script both under Solaris and Win-32 Active State, Perl 5.6 in both cases. Same result.


Everything will go worng!


In reply to use strict won't require explicit name for all variables? by Biker

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others surveying the Monastery: (19)
    As of 2015-07-28 15:26 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (257 votes), past polls