Thanks a bunch Timothy and Charles for guiding me to wonderful resources within
the Perl system.
use diagnostics qw/-verbose/; it slipped my attention. (Courtesy : Charles)
'perldoc -f qw (Courtesy : Timothy)
Actually I am a guiding junior Perl programmers (having little or no prior
experience in Perl) and I am in the process of preparing a document with
suitable code snippets which includes the most common Perl programming errors
and warnings.
Your valuable input is highly appreciated and I cherish the treasure which I
learned from you.
best,
Shaji
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________________________________
From: timothy adigun <2teezp...@gmail.com>
To: *Shaji Kalidasan* <shajiin...@yahoo.com>
Cc: Perl Beginners <beginners@perl.org>
Sent: Wednesday, 29 May 2013 9:26 AM
Subject: Re: Perl error codes and warnings
Hi Shaji,
On Wed, May 29, 2013 at 4:19 AM, *Shaji Kalidasan* <shajiin...@yahoo.com> wrote:
Greetings,
>
>
>Where can I get more information on Perl's most common error codes? Is there a
>single source (repository/resource) for such most frequently encountered error
>codes?
>
>
>[code-1]
>use strict;
>use warnings;
>
>my @names = qw/bat, ball, %&!*, king, (^@), eagle, zebra/;
>
with "qw", you don't use a 'comma' to separate the element of the array.
Because, the element are separated by space.
So, the correct thing to do is:
my @names = qw/bat ball %&!* king (^@) eagle zebra/;
foreach (@names) {
> print "$_\n" if /\w/;
>}
>[/code-1]
>
>
>[output-1]
>Possible attempt to separate words with commas at C:/Users/shaji
>kalidasan/workspace/juno-sr1/shaji/Shaji Code Snippets/hari.pl line 4.
>bat,
>ball,
>king,
>eagle,
>zebra
>[/output-1]
>
>
>[code-2]
>use strict;
>use warnings;
>
>my @names = qw/orange apple %&!*# banana (^@) grapes mango/;
>
Also, with "qw", you can't use '#', the use warnings gives a warning that the
string contain '#'.
So, to use your expression, you can do like so:
my @names = split/\s/, q/orange apple %&!*# banana (^@) grapes mango/;
foreach (@names) {
> print "$_\n" if /\w/;
>}
>[/code-2]
>
>
>[output-2]
>orange
>apple
>banana
>grapes
>mango
>Possible attempt to put comments in qw() list at C:/Users/shaji
>kalidasan/workspace/juno-sr1/shaji/Shaji Code Snippets/hari.pl line 4.
>
>[/output-2]
>
>
>So considering these two programs mentioned above, I am getting the following
>warning messages
>
>
>1) Possible attempt to separate
words with commas at C:/Users/shaji
kalidasan/workspace/juno-sr1/shaji/Shaji Code Snippets/hari.pl line 4.
>
>
>2) Possible attempt to put
comments in qw() list at C:/Users/shaji
kalidasan/workspace/juno-sr1/shaji/Shaji Code Snippets/hari.pl line 4.
>
>
>Please suggest some pointers or resources for this type of frequently
>encountered error codes/warnings and its possible meanings.
>
In fact, if you do 'perldoc -f qw' from the Command Line Interface, the last
paragraph says:
A common mistake is to try to separate the words with comma
or to put comments into a multi-line "qw"-string. For this
reason, the "use warnings" pragma and the --ww switch (that
is, the $^W variable) produces warnings if the STRING
contains the "," or the "#" character.
Hope this helps
