[33074] in Perl-Users-Digest
Perl-Users Digest, Issue: 4350 Volume: 11
daemon@ATHENA.MIT.EDU (Perl-Users Digest)
Sat Jan 17 05:17:20 2015
Date: Sat, 17 Jan 2015 02:17:04 -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 Sat, 17 Jan 2015 Volume: 11 Number: 4350
Today's topics:
Re: What is ++ operation <jurgenex@hotmail.com>
Re: What is ++ operation <news@todbe.com>
Re: What is ++ operation <xemoth@gmail.com>
Re: What is ++ operation <rweikusat@mobileactivedefense.com>
Digest Administrivia (Last modified: 6 Apr 01) (Perl-Users-Digest Admin)
----------------------------------------------------------------------
Date: Thu, 15 Jan 2015 22:18:49 -0800
From: Jürgen Exner <jurgenex@hotmail.com>
Subject: Re: What is ++ operation
Message-Id: <15bhba5fmj9mhv25pi1ejnu6t7keebr6u1@4ax.com>
Paul Gekakis <pgek48@aol.com> wrote:
[ What is ++ operation]
See "perldoc perlop":
<quote>
Auto-increment and Auto-decrement
"++" and "--" work as in C. That is, [...]
</quote>
jue
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Date: Thu, 15 Jan 2015 22:32:43 -0800
From: "$Bill" <news@todbe.com>
Subject: Re: What is ++ operation
Message-Id: <54B8B08B.3040605@todbe.com>
On 1/15/2015 20:46, Tim McDaniel wrote:
> In article <OPidnRL2ic2UEiXJnZ2dnUU7-N-dnZ2d@giganews.com>,
> Paul Gekakis <pgek48@aol.com> wrote:
>> thanks
>
> ... It's hard to know how to answer the question well -- not because
> it's not well-known, but because it's in any textbook on the language
>
> For the immediate question, if your system has "man perlop" available,
> you can do
> /Auto-increment and Auto-decrement
> and get an explanation.
>
> http://perldoc.perl.org/perlop.html#Auto-increment-and-Auto-decrement
> reaches the same explanation.
>
> "Increment" means "increase by one", and "decrement" means "decrease
> by one".
Also, the position indicates whether it's a pre-inc/dec or a post-inc/dec.
EG: ++$x or --$xx vs $x++ or $x--
------------------------------
Date: Fri, 16 Jan 2015 02:04:45 -0800 (PST)
From: Owen <xemoth@gmail.com>
Subject: Re: What is ++ operation
Message-Id: <a995e92d-6ae1-492e-80d2-9ced0677f63d@googlegroups.com>
On Friday, January 16, 2015 at 3:09:52 PM UTC+11, Paul Gekakis wrote:
> thanks
Try by experiment, here's a variation;
===============================
#!/usr/bin/perl
use strict;
my $letter = "a";
foreach (1 .. 26){
print "$letter\n";
$letter++;
}
==============================
Owen
------------------------------
Date: Fri, 16 Jan 2015 16:22:22 +0000
From: Rainer Weikusat <rweikusat@mobileactivedefense.com>
Subject: Re: What is ++ operation
Message-Id: <8761c6vgox.fsf@doppelsaurus.mobileactivedefense.com>
Owen <xemoth@gmail.com> writes:
> On Friday, January 16, 2015 at 3:09:52 PM UTC+11, Paul Gekakis wrote:
>> thanks
>
> Try by experiment, here's a variation;
>
> ===============================
>
> #!/usr/bin/perl
>
> use strict;
>
> my $letter = "a";
>
> foreach (1 .. 26){
> print "$letter\n";
> $letter++;
> }
>
> ==============================
While that's surely "what every one else does", it's IMHO a bad
example. The postincrement (and -decrement) operators have very
peculiar semantics, namely 'modify the value but return the previous
value. Unless that's specifically what's intended, eg, as a bad example,
perl -e 'my $l = "a"; print $l++,"\n" for 1 .. 26'
one should consider using the simpler preincrement (or -decrement)
operator instead (returning the new value).
------------------------------
Date: 6 Apr 2001 21:33:47 GMT (Last modified)
From: Perl-Users-Request@ruby.oce.orst.edu (Perl-Users-Digest Admin)
Subject: Digest Administrivia (Last modified: 6 Apr 01)
Message-Id: <null>
Administrivia:
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End of Perl-Users Digest V11 Issue 4350
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