[22554] in Perl-Users-Digest
Perl-Users Digest, Issue: 4775 Volume: 10
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Fri Mar 28 06:10:39 2003
Date: Fri, 28 Mar 2003 03:10:13 -0800 (PST)
From: Perl-Users Digest <Perl-Users-Request@ruby.OCE.ORST.EDU>
To: Perl-Users@ruby.OCE.ORST.EDU (Perl-Users Digest)
Perl-Users Digest Fri, 28 Mar 2003 Volume: 10 Number: 4775
Today's topics:
Posting Guidelines for comp.lang.perl.misc ($Revision: tadmc@augustmail.com
Re: RegEx & Number of matches Q: (Tad McClellan)
Re: regex question (Anno Siegel)
Re: search.cpan.org seems to be down (Anno Siegel)
Re: Simple CGI Select by Date <simon.oliver@nospam.umist.ac.uk>
Re: simple substitution also changes line endings (Helgi Briem)
Re: Sorting keys in a hash runs slower now. (C Marshall)
Re: Sorting keys in a hash runs slower now. <no@spam.for.me.invalid>
Re: Sorting keys in a hash runs slower now. (Anno Siegel)
Re: Using perl to read/write Excel and Foxpro? rolf.schaufelberger@web.de
Re: What does $_ ^= $_++; do? <abigail@abigail.nl>
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Fri, 28 Mar 2003 02:22:23 -0600
From: tadmc@augustmail.com
Subject: Posting Guidelines for comp.lang.perl.misc ($Revision: 1.4 $)
Message-Id: <qsKdnfdLKMaimxmjXTWcoQ@august.net>
Outline
Before posting to comp.lang.perl.misc
Must
- Check the Perl Frequently Asked Questions (FAQ)
- Check the other standard Perl docs (*.pod)
Really Really Should
- Lurk for a while before posting
- Search a Usenet archive
If You Like
- Check Other Resources
Posting to comp.lang.perl.misc
Is there a better place to ask your question?
- Question should be about Perl, not about the application area
How to participate (post) in the clpmisc community
- Carefully choose the contents of your Subject header
- Use an effective followup style
- Speak Perl rather than English, when possible
- Ask perl to help you
- Do not re-type Perl code
- Provide enough information
- Do not provide too much information
- Do not post binaries, HTML, or MIME
Social faux pas to avoid
- Asking a Frequently Asked Question
- Asking a question easily answered by a cursory doc search
- Asking for emailed answers
- Beware of saying "doesn't work"
- Sending a "stealth" Cc copy
Be extra cautious when you get upset
- Count to ten before composing a followup when you are upset
- Count to ten after composing and before posting when you are upset
-----------------------------------------------------------------
Posting Guidelines for comp.lang.perl.misc ($Revision: 1.4 $)
This newsgroup, commonly called clpmisc, is a technical newsgroup
intended to be used for discussion of Perl related issues (except job
postings), whether it be comments or questions.
As you would expect, clpmisc discussions are usually very technical in
nature and there are conventions for conduct in technical newsgroups
going somewhat beyond those in non-technical newsgroups.
This article describes things that you should, and should not, do to
increase your chances of getting an answer to your Perl question. It is
available in POD, HTML and plain text formats at:
http://mail.augustmail.com/~tadmc/clpmisc.shtml
For more information about netiquette in general, see the "Netiquette
Guidelines" at:
http://andrew2.andrew.cmu.edu/rfc/rfc1855.html
A note to newsgroup "regulars":
Do not use these guidelines as a "license to flame" or other
meanness. It is possible that a poster is unaware of things
discussed here. Give them the benefit of the doubt, and just
help them learn how to post, rather than assume
A note about technical terms used here:
In this document, we use words like "must" and "should" as
they're used in technical conversation (such as you will
encounter in this newsgroup). When we say that you *must* do
something, we mean that if you don't do that something, then
it's unlikely that you will benefit much from this group.
We're not bossing you around; we're making the point without
lots of words.
Do *NOT* send email to the maintainer of these guidelines. It will be
discarded unread. The guidelines belong to the newsgroup so all
discussion should appear in the newsgroup. I am just the secretary that
writes down the consensus of the group.
Before posting to comp.lang.perl.misc
Must
This section describes things that you *must* do before posting to
clpmisc, in order to maximize your chances of getting meaningful replies
to your inquiry and to avoid getting flamed for being lazy and trying to
have others do your work.
The perl distribution includes documentation that is copied to your hard
drive when you install perl. Also installed is a program for looking
things up in that (and other) documentation named 'perldoc'.
You should either find out where the docs got installed on your system,
or use perldoc to find them for you. Type "perldoc perldoc" to learn how
to use perldoc itself. Type "perldoc perl" to start reading Perl's
standard documentation.
Check the Perl Frequently Asked Questions (FAQ)
Checking the FAQ before posting is required in Big 8 newsgroups in
general, there is nothing clpmisc-specific about this requirement.
You are expected to do this in nearly all newsgroups.
You can use the "-q" switch with perldoc to do a word search of the
questions in the Perl FAQs.
Check the other standard Perl docs (*.pod)
The perl distribution comes with much more documentation than is
available for most other newsgroups, so in clpmisc you should also
see if you can find an answer in the other (non-FAQ) standard docs
before posting.
It is *not* required, or even expected, that you actually *read* all of
Perl's standard docs, only that you spend a few minutes searching them
before posting.
Try doing a word-search in the standard docs for some words/phrases
taken from your problem statement or from your very carefully worded
"Subject:" header.
Really Really Should
This section describes things that you *really should* do before posting
to clpmisc.
Lurk for a while before posting
This is very important and expected in all newsgroups. Lurking means
to monitor a newsgroup for a period to become familiar with local
customs. Each newsgroup has specific customs and rituals. Knowing
these before you participate will help avoid embarrassing social
situations. Consider yourself to be a foreigner at first!
Search a Usenet archive
There are tens of thousands of Perl programmers. It is very likely
that your question has already been asked (and answered). See if you
can find where it has already been answered.
One such searchable archive is:
http://groups.google.com/advanced_group_search
If You Like
This section describes things that you *can* do before posting to
clpmisc.
Check Other Resources
You may want to check in books or on web sites to see if you can
find the answer to your question.
But you need to consider the source of such information: there are a
lot of very poor Perl books and web sites, and several good ones
too, of course.
Posting to comp.lang.perl.misc
There can be 200 messages in clpmisc in a single day. Nobody is going to
read every article. They must decide somehow which articles they are
going to read, and which they will skip.
Your post is in competition with 199 other posts. You need to "win"
before a person who can help you will even read your question.
These sections describe how you can help keep your article from being
one of the "skipped" ones.
Is there a better place to ask your question?
Question should be about Perl, not about the application area
It can be difficult to separate out where your problem really is,
but you should make a conscious effort to post to the most
applicable newsgroup. That is, after all, where you are the most
likely to find the people who know how to answer your question.
Being able to "partition" a problem is an essential skill for
effectively troubleshooting programming problems. If you don't get
that right, you end up looking for answers in the wrong places.
It should be understood that you may not know that the root of your
problem is not Perl-related (the two most frequent ones are CGI and
Operating System related), so off-topic postings will happen from
time to time. Be gracious when someone helps you find a better place
to ask your question by pointing you to a more applicable newsgroup.
How to participate (post) in the clpmisc community
Carefully choose the contents of your Subject header
You have 40 precious characters of Subject to win out and be one of
the posts that gets read. Don't waste them. Take care while
composing them, they are the key that opens the door to getting an
answer.
Spend them indicating what aspect of Perl others will find if they
should decide to read your article.
Do not spend them indicating "experience level" (guru, newbie...).
Do not spend them pleading (please read, urgent, help!...).
Do not spend them on non-Subjects (Perl question, one-word
Subject...)
For more information on choosing a Subject see "Choosing Good
Subject Lines":
http://www.cpan.org/authors/id/D/DM/DMR/subjects.post
Part of the beauty of newsgroup dynamics, is that you can contribute
to the community with your very first post! If your choice of
Subject leads a fellow Perler to find the thread you are starting,
then even asking a question helps us all.
Use an effective followup style
When composing a followup, quote only enough text to establish the
context for the comments that you will add. Always indicate who
wrote the quoted material. Never quote an entire article. Never
quote a .signature (unless that is what you are commenting on).
Intersperse your comments *following* each section of quoted text to
which they relate. Unappreciated followup styles are referred to as
"Jeopardy" (because the answer comes before the question), or
"TOFU".
Reversing the chronology of the dialog makes it much harder to
understand (some folks won't even read it if written in that style).
For more information on quoting style, see:
http://web.presby.edu/~nnqadmin/nnq/nquote.html
Speak Perl rather than English, when possible
Perl is much more precise than natural language. Saying it in Perl
instead will avoid misunderstanding your question or problem.
Do not say: I have variable with "foo\tbar" in it.
Instead say: I have $var = "foo\tbar", or I have $var = 'foo\tbar',
or I have $var = <DATA> (and show the data line).
Ask perl to help you
You can ask perl itself to help you find common programming mistakes
by doing two things: enable warnings (perldoc warnings) and enable
"strict"ures (perldoc strict).
You should not bother the hundreds/thousands of readers of the
newsgroup without first seeing if a machine can help you find your
problem. It is demeaning to be asked to do the work of a machine. It
will annoy the readers of your article.
You can look up any of the messages that perl might issue to find
out what the message means and how to resolve the potential mistake
(perldoc perldiag). If you would like perl to look them up for you,
you can put "use diagnostics;" near the top of your program.
Do not re-type Perl code
Use copy/paste or your editor's "import" function rather than
attempting to type in your code. If you make a typo you will get
followups about your typos instead of about the question you are
trying to get answered.
Provide enough information
If you do the things in this item, you will have an Extremely Good
chance of getting people to try and help you with your problem!
These features are a really big bonus toward your question winning
out over all of the other posts that you are competing with.
First make a short (less than 20-30 lines) and *complete* program
that illustrates the problem you are having. People should be able
to run your program by copy/pasting the code from your article. (You
will find that doing this step very often reveals your problem
directly. Leading to an answer much more quickly and reliably than
posting to Usenet.)
Describe *precisely* the input to your program. Also provide example
input data for your program. If you need to show file input, use the
__DATA__ token (perldata.pod) to provide the file contents inside of
your Perl program.
Show the output (including the verbatim text of any messages) of
your program.
Describe how you want the output to be different from what you are
getting.
If you have no idea at all of how to code up your situation, be sure
to at least describe the 2 things that you *do* know: input and
desired output.
Do not provide too much information
Do not just post your entire program for debugging. Most especially
do not post someone *else's* entire program.
Do not post binaries, HTML, or MIME
clpmisc is a text only newsgroup. If you have images or binaries
that explain your question, put them in a publically accessible
place (like a Web server) and provide a pointer to that location. If
you include code, cut and paste it directly in the message body.
Don't attach anything to the message. Don't post vcards or HTML.
Many people (and even some Usenet servers) will automatically filter
out such messages. Many people will not be able to easily read your
post. Plain text is something everyone can read.
Social faux pas to avoid
The first two below are symptoms of lots of FAQ asking here in clpmisc.
It happens so often that folks will assume that it is happening yet
again. If you have looked but not found, or found but didn't understand
the docs, say so in your article.
Asking a Frequently Asked Question
It should be understood that you may have missed the applicable FAQ
when you checked, which is not a big deal. But if the Frequently
Asked Question is worded similar to your question, folks will assume
that you did not look at all. Don't become indignant at pointers to
the FAQ, particularly if it solves your problem.
Asking a question easily answered by a cursory doc search
If folks think you have not even tried the obvious step of reading
the docs applicable to your problem, they are likely to become
annoyed.
If you are flamed for not checking when you *did* check, then just
shrug it off (and take the answer that you got).
Asking for emailed answers
Emailed answers benefit one person. Posted answers benefit the
entire community. If folks can take the time to answer your
question, then you can take the time to go get the answer in the
same place where you asked the question.
It is OK to ask for a *copy* of the answer to be emailed, but many
will ignore such requests anyway. If you munge your address, you
should never expect (or ask) to get email in response to a Usenet
post.
Ask the question here, get the answer here (maybe).
Beware of saying "doesn't work"
This is a "red flag" phrase. If you find yourself writing that,
pause and see if you can't describe what is not working without
saying "doesn't work". That is, describe how it is not what you
want.
Sending a "stealth" Cc copy
A "stealth Cc" is when you both email and post a reply without
indicating *in the body* that you are doing so.
Be extra cautious when you get upset
Count to ten before composing a followup when you are upset
This is recommended in all Usenet newsgroups. Here in clpmisc, most
flaming sub-threads are not about any feature of Perl at all! They
are most often for what was seen as a breach of netiquette. If you
have lurked for a bit, then you will know what is expected and won't
make such posts in the first place.
But if you get upset, wait a while before writing your followup. I
recommend waiting at least 30 minutes.
Count to ten after composing and before posting when you are upset
After you have written your followup, wait *another* 30 minutes
before committing yourself by posting it. You cannot take it back
once it has been said.
AUTHOR
Tad McClellan <tadmc@augustmail.com> and many others on the
comp.lang.perl.misc newsgroup.
------------------------------
Date: Thu, 27 Mar 2003 22:23:14 -0600
From: tadmc@augustmail.com (Tad McClellan)
Subject: Re: RegEx & Number of matches Q:
Message-Id: <slrnb87jhi.1uq.tadmc@magna.augustmail.com>
Joshua McAdams <jmcada@hotmail.com> wrote:
> "Shawn B." <leabre@html.com> wrote in message
> news:WDPga.5483$lD.346983453@newssvr21.news.prodigy.com...
>>
>> I want to be able to search a string and find a match *only* if n number
> of
>> CAPS are found in the string
>> (BTW, I'm using the .NET RegEx syntax but I'm
>> happy with Perl for the sake of figuring out somethign that actually
>> works)...
In Perl you would not use the pattern match operator at all.
You'd do it with some other operator (See below).
> This isn't exactly a regular expression,
It most clearly is not any kind of regular expression.
tr/// has nothing to do with regular expressions, despite its
unfortunate similarity visually.
> you can use the tr// operator.
--
Tad McClellan SGML consulting
tadmc@augustmail.com Perl programming
Fort Worth, Texas
------------------------------
Date: 28 Mar 2003 10:52:22 GMT
From: anno4000@lublin.zrz.tu-berlin.de (Anno Siegel)
Subject: Re: regex question
Message-Id: <b619h6$4vj$2@mamenchi.zrz.TU-Berlin.DE>
Michael P. Broida <michael.p.broida@boeing.com> wrote in comp.lang.perl.misc:
> Jeff D Gleixner wrote:
> >
> > Gary Fu wrote:
> > > Hi,
> > >
> > > if $xx = 'ABC 123 a b c', I want $id = 123 and $txt = 'b c';
> > > if $xx = 'ABC 123 a c c', I want $id = 123 and don't care about $txt
> > >
> > > I cannot figure out how to do this with something like
> > >
> > > ($id, $txt) = $xx =~ /ABC (\d+) (b c)/ # I won't get $id for the 2nd case.
> >
> > ($id, $txt) = $xx =~ /ABC (\d+) (b c)?/ ;
> >
> > The '?' means 0 or more.
Actually, it means 0 or one.
> I think he also needs an "a" in there or it won't
> match what he specified at the top of his post.
>
> ($id, $txt) = $xx =~ /ABC (\d+) a (b c)?/ ;
Getting there...
Anno
------------------------------
Date: 28 Mar 2003 09:53:34 GMT
From: anno4000@lublin.zrz.tu-berlin.de (Anno Siegel)
Subject: Re: search.cpan.org seems to be down
Message-Id: <b6162u$sfb$2@mamenchi.zrz.TU-Berlin.DE>
none <webmastr@localhost.localdomain> wrote in comp.lang.perl.misc:
> Hello,
> About 2 days now. Has anyone experienced the same problem? Are there any
> alternate sites that post module documentation?
http://theoryx5.uwinnipeg.ca/CPAN/cpan-search.html
Anno
------------------------------
Date: Fri, 28 Mar 2003 08:54:49 +0000
From: Simon Oliver <simon.oliver@nospam.umist.ac.uk>
Subject: Re: Simple CGI Select by Date
Message-Id: <3E840DD9.9040307@nospam.umist.ac.uk>
Benjamin Goldberg wrote:
> Simon Oliver wrote:
> [snip]
>
>>use POSIX qw(mktime);
>
>
> What is the advantage of mktime from POSIX over timelocal from
> Time::Local? (Especially consider that Time::Local is pure-perl, and
> POSIX.pm has an XS part).
None AFAIK.
Also, one could avoid the use of HTML::Entities by incuding a simple
encode sub. Here's the revised code:
use strict;
use Time::Local;
my $title = "Avaiable Recruitment Jobs";
my $file = "jobsfile.tab";
print "Content-Type: text/html\n\n",
"<HTML><HEAD><TITLE>$title</TITLE></HEAD>",
"<BODY><H4>$title</H4>";
if (open FH, "<$file") {
my @records;
while (<FH>) {
chomp;
my ($date, $text) = split(/\t/) or next;
my ($year, $mon, $mday) = split(/[\/-]/,$date);
my $time = timelocal(0,0,0,$mday,$mon-1,$year-1900);
push(@records, [$time,$date,$text]) if time() < $time;
}
if (@records) {
print '<TABLE BORDER="1"><TR><TH>Date</TH><TH>Text</TH></TR>';
foreach my $record (sort {$a->[0] cmp $b->[0]} @records) {
my $date = $record->[1];
my $text = encode_html($record->[2]);
print "<TR><TD>$date</TD><TD>$text</TD>";
}
print "</TABLE>\n</BODY>\n</HTML>";
} else {
print "<H4>No records in job file!</H4></BODY></HTML>";
}
} else {
print "<H4>Error opening job file!</H4></BODY></HTML>";
die "Error opening job file '$file':$!\n";
}
sub encode_html {
my $val = shift;
return unless defined $val;
$val=~s/&/&/g;
$val=~s/\"/"/g;
$val=~s/>/>/g;
$val=~s/</</g;
return $val;
}
--
Simon Oliver
------------------------------
Date: Fri, 28 Mar 2003 09:56:51 GMT
From: helgi@decode.is (Helgi Briem)
Subject: Re: simple substitution also changes line endings
Message-Id: <3e841c0f.4227025280@news.cis.dfn.de>
On Thu, 27 Mar 2003 21:21:15 GMT, "Michael P. Broida"
<michael.p.broida@boeing.com> wrote:
> You can do a more "character-oriented" I/O and
> Windows won't touch that. Emacs must use that
> method because it will (if told to) leave the
> line-terminations alone. I don't know how to
> make Perl do the same.
>
> Basically: don't edit Unix files on a Windows
> system. <grin>
Baloney. I have done it every day for the last
6 years and have had no problems since I learned
to do it correctly. Don't spread FUD.
--
Regards, Helgi Briem
helgi DOT briem AT decode DOT is
------------------------------
Date: 28 Mar 2003 01:30:20 -0800
From: c_j_marshall@hotmail.com (C Marshall)
Subject: Re: Sorting keys in a hash runs slower now.
Message-Id: <cb9c7b76.0303280130.445ead3b@posting.google.com>
Benjamin Goldberg <goldbb2@earthlink.net> wrote in message
> A hash with "O/N", "T/N", and "S/N" as keys, and 1, 2, 3 as values.
>
> I've no idea what these strings actually mean, but I assume that they
> are really small time units.
O/N = Overnight
T/N = Tomorrow to Next Day
S/N = Spot to Next Day. Spot usually = 2 days
> > Please could you explain how this works in more detail for me.
>
> I hope my explanation is useful to you.
Very much so - thanks.
------------------------------
Date: Fri, 28 Mar 2003 10:12:49 GMT
From: Nils Petter Vaskinn <no@spam.for.me.invalid>
Subject: Re: Sorting keys in a hash runs slower now.
Message-Id: <pan.2003.03.28.11.08.19.363402.1666@spam.for.me.invalid>
On Fri, 28 Mar 2003 03:18:28 +0100, Benjamin Goldberg wrote:
> C Marshall wrote:
>>
>> Benjamin Goldberg <goldbb2@earthlink.net> wrote in message
>> > my %scale = qw( Y 1 M 12 W 52 );
>
> A hash with "Y", "M", "W", as keys, and 1, 12, and 52 as values.
>
> This will be used to scale units into fractions of a year -- thus a
> string "9M" is the number 9/12, and "3W" is the number 3/52.
>> > $aval / $scale{$atype} cmp $bval / $scale{$btype};
>
> This scales the numbers down to be years or fractions of a year, as I
> described earlier.
>
I'm quite new to perl so this is just a shot in the dark. But in most
programming languages I've touched floating point arithmetic is more
expensive than integer. Is this the case for perl too?
Wouldn't
my %scale = qw(Y 52 M 12 W 1);
and then in the final comparison:
$aval * scale{$atype} cmp $bval / $scale{$btype};
be more efficient?
This is ofcource assuming that working with integers gives an actual
(significant) improvement over floating point. If it isn't please let me
know and I'll stop wasting time trying to force things to be integers in
the future.
NP
------------------------------
Date: 28 Mar 2003 10:29:50 GMT
From: anno4000@lublin.zrz.tu-berlin.de (Anno Siegel)
Subject: Re: Sorting keys in a hash runs slower now.
Message-Id: <b6186u$sfb$3@mamenchi.zrz.TU-Berlin.DE>
Nils Petter Vaskinn <no@spam.for.me.invalid> wrote in comp.lang.perl.misc:
[...]
> I'm quite new to perl so this is just a shot in the dark. But in most
> programming languages I've touched floating point arithmetic is more
> expensive than integer.
That would depend both on the processor and the language, or rather
the specific implementation.
> Is this the case for perl too?
No. For one, even integers are stored and processed as floats (unless
you "use integer"). More importantly, the overhead in calling a Perl
operator is many times the cost of a numeric operation, never mind which,
so the difference would be insignificant in any case.
Anno
------------------------------
Date: Fri, 28 Mar 2003 09:36:50 +0100
From: rolf.schaufelberger@web.de
Subject: Re: Using perl to read/write Excel and Foxpro?
Message-Id: <b611ft$5us$04$1@news.t-online.com>
Ivan Marsh wrote:
> Hey Folks,
>
> I'm new to the Perl groups and I'm at the "Hello World" point in my
> experience with Perl. If my question is outside the purview of the groups
> I've posted to please let me know.
>
> My next project is to parse MS Excel spreadsheets into either Foxpro or
> dBase .dbf files. For cross-compatibility sake (Linux, SCO and Win32
> platforms all being used here), and using tools that are already common to
> our site, I'm hoping that Perl will be a good tool to do this.
>
> Can anyone point in to some resources for using Perl with these file
> formats? Required/available modules, example code etc...
>
> thx i.m.
looking at CPAN gives :
Going to read /root/.cpan/sources/modules/03modlist.data.gz
Going to write /root/.cpan/Metadata
Distribution I/IS/ISTERIN/XML-Excel-0.02.tar.gz
Distribution I/IS/ISTERIN/XML-SAXDriver-Excel-0.06.tar.gz
Distribution J/JM/JMCNAMARA/Spreadsheet-WriteExcel-0.40.tar.gz
Distribution K/KW/KWITKNR/DBD-Excel-0.06.tar.gz
Distribution K/KW/KWITKNR/Spreadsheet-ParseExcel-0.2602.tar.gz
Distribution R/RK/RKITOVER/Spreadsheet-ParseExcel_XLHTML-0.02.tar.gz
Distribution S/SP/SPOON/DateTime-Format-Excel-0.27.tar.gz
Distribution T/TM/TMTM/Spreadsheet-ParseExcel-Simple-1.01.tar.gz
Distribution T/TM/TMTM/Spreadsheet-WriteExcel-FromDB-0.09.tar.gz
Distribution T/TM/TMTM/Spreadsheet-WriteExcel-Simple-0.03.tar.gz
Module DBD::Excel (K/KW/KWITKNR/DBD-Excel-0.06.tar.gz)
Module DateTime::Format::Excel
(S/SP/SPOON/DateTime-Format-Excel-0.27.tar.gz)
Module Spreadsheet::Excel (Contact Author Rachel McGregor Rawlings
<rachel@wuxtry.com>)
Module Spreadsheet::ParseExcel
(K/KW/KWITKNR/Spreadsheet-ParseExcel-0.2602.tar.gz)
Module Spreadsheet::ParseExcel::Dump
(K/KW/KWITKNR/Spreadsheet-ParseExcel-0.2602.tar.gz)
Module Spreadsheet::ParseExcel::FmtDefault
(K/KW/KWITKNR/Spreadsheet-ParseExcel-0.2602.tar.gz)
Module Spreadsheet::ParseExcel::FmtJapan
(K/KW/KWITKNR/Spreadsheet-ParseExcel-0.2602.tar.gz)
Module Spreadsheet::ParseExcel::FmtJapan2
(K/KW/KWITKNR/Spreadsheet-ParseExcel-0.2602.tar.gz)
Module Spreadsheet::ParseExcel::FmtUnicode
(K/KW/KWITKNR/Spreadsheet-ParseExcel-0.2602.tar.gz)
Module Spreadsheet::ParseExcel::SaveParser
(K/KW/KWITKNR/Spreadsheet-ParseExcel-0.2602.tar.gz)
Module Spreadsheet::ParseExcel::Simple
(T/TM/TMTM/Spreadsheet-ParseExcel-Simple-1.01.tar.gz)
Module Spreadsheet::ParseExcel::Utility
(K/KW/KWITKNR/Spreadsheet-ParseExcel-0.2602.tar.gz)
Module Spreadsheet::ParseExcel_XLHTML
(R/RK/RKITOVER/Spreadsheet-ParseExcel_XLHTML-0.02.tar.gz)
Module Spreadsheet::WriteExcel
(J/JM/JMCNAMARA/Spreadsheet-WriteExcel-0.40.tar.gz)
Module Spreadsheet::WriteExcel::BIFFwriter
(J/JM/JMCNAMARA/Spreadsheet-WriteExcel-0.40.tar.gz)
Module Spreadsheet::WriteExcel::Big
(J/JM/JMCNAMARA/Spreadsheet-WriteExcel-0.40.tar.gz)
Module Spreadsheet::WriteExcel::Format
(J/JM/JMCNAMARA/Spreadsheet-WriteExcel-0.40.tar.gz)
Module Spreadsheet::WriteExcel::Formula
(J/JM/JMCNAMARA/Spreadsheet-WriteExcel-0.40.tar.gz)
Module Spreadsheet::WriteExcel::FromDB
(T/TM/TMTM/Spreadsheet-WriteExcel-FromDB-0.09.tar.gz)
Module Spreadsheet::WriteExcel::FromDB::Oracle
(T/TM/TMTM/Spreadsheet-WriteExcel-FromDB-0.09.tar.gz)
Module Spreadsheet::WriteExcel::FromDB::Pg
(T/TM/TMTM/Spreadsheet-WriteExcel-FromDB-0.09.tar.gz)
Module Spreadsheet::WriteExcel::FromDB::column_finder
(T/TM/TMTM/Spreadsheet-WriteExcel-FromDB-0.09.tar.gz)
Module Spreadsheet::WriteExcel::FromDB::mysql
(T/TM/TMTM/Spreadsheet-WriteExcel-FromDB-0.09.tar.gz)
Module Spreadsheet::WriteExcel::FromDB::sybase
(T/TM/TMTM/Spreadsheet-WriteExcel-FromDB-0.09.tar.gz)
Module Spreadsheet::WriteExcel::OLEwriter
(J/JM/JMCNAMARA/Spreadsheet-WriteExcel-0.40.tar.gz)
Module Spreadsheet::WriteExcel::Simple
(T/TM/TMTM/Spreadsheet-WriteExcel-Simple-0.03.tar.gz)
Module Spreadsheet::WriteExcel::Utility
(J/JM/JMCNAMARA/Spreadsheet-WriteExcel-0.40.tar.gz)
Module Spreadsheet::WriteExcel::Workbook
(J/JM/JMCNAMARA/Spreadsheet-WriteExcel-0.40.tar.gz)
Module Spreadsheet::WriteExcel::WorkbookBig
(J/JM/JMCNAMARA/Spreadsheet-WriteExcel-0.40.tar.gz)
Module Spreadsheet::WriteExcel::Worksheet
(J/JM/JMCNAMARA/Spreadsheet-WriteExcel-0.40.tar.gz)
Module Win32::ShellExt::ExcelToClipboard
(J/JB/JBNIVOIT/Win32-ShellExt-0.1.zip)
Module XML::Excel (I/IS/ISTERIN/XML-Excel-0.02.tar.gz)
Module XML::SAXDriver::Excel
(I/IS/ISTERIN/XML-SAXDriver-Excel-0.06.tar.gz)
43 items found
Hope it helps.
Rolf
rolf.schaufelberger@web.de
------------------------------
Date: 28 Mar 2003 08:08:28 GMT
From: Abigail <abigail@abigail.nl>
Subject: Re: What does $_ ^= $_++; do?
Message-Id: <slrnb880ns.lrb.abigail@alexandra.abigail.nl>
bd (bdonlan@bd-home-comp.no-ip.org) wrote on MMMCDXCVI September MCMXCIII
in <URL:news:pan.2003.03.28.02.27.23.915178@bd-home-comp.no-ip.org>:
:} On Fri, 28 Mar 2003 00:24:07 +0000, James E Keenan wrote:
:}
:} >
:} > "bd" <bdonlan@bd-home-comp.no-ip.org> wrote in message
:} > news:pan.2003.03.27.23.59.21.885179@bd-home-comp.no-ip.org...
:} >> What does $_ ^= $_++; do? The C equivalent is undefined behavior - is it
:} >> on perl, too? It behaves weirdly, but the weirdness seems to be
:} >> deterministic, based on the previous value of $_.
:} >> --
:} >
:} > A good question ... and the Perl documentation (perldoc perlop as well as
:} > Camel book, p107) simply say "Perl recognizes the C assignment operators, as
:} > well as providing some of its own." This offers no guidance to anyone who
:} > hasn't already studied C. Can some C-programmers help us out?
:}
:} Actually, I am a c programmer. In c:
:}
:} unsigned int i = (something);
:} i ^= i++;
:}
:} Is undefined behavior, as you're modifying a variable twice without an
:} intervening sequence point. But does this hold for perl as well?
Yes. '++' is documented to work "as in C" (with one exception, but
that's not applicable here).
Abigail
--
perl5.004 -wMMath::BigInt -e'$^V=Math::BigInt->new(qq]$^F$^W783$[$%9889$^F47]
.qq]$|88768$^W596577669$%$^W5$^F3364$[$^W$^F$|838747$[8889739$%$|$^F673$%$^W]
.qq]98$^F76777$=56]);$^U=substr($]=>$|=>5)*(q.25..($^W=@^V))=>do{print+chr$^V
%$^U;$^V/=$^U}while$^V!=$^W'
------------------------------
Date: 6 Apr 2001 21:33:47 GMT (Last modified)
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Subject: Digest Administrivia (Last modified: 6 Apr 01)
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End of Perl-Users Digest V10 Issue 4775
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