IP addresses?

#!/usr/bin/perl

use strict;
use warnings;

my @ips=(
  74.117.115.116,
  32.97.110.111,
  116.104.101.114,
  32.80.101.114,
  108.32.104.97,
  99.107.101.114,
  44.32.32.10,
);

print for @ips;

[download]

Replies are listed 'Best First'.
Re: IP addresses? by cristian (Hermit) on Aug 18, 2005 at 14:59 UTC
`Simply Example 1: without "for" my @ips=( 74.117.115.116, 32.97.110.111, 116.104.101.114, 32.80.101.114, 108.32.104.97, 99.107.101.114, 44.32.32.10, ); print @ips; Example 2: whithout @ips print ( 74.117.115.116, 32.97.110.111, 116.104.101.114, 32.80.101.114, 108.32.104.97, 99.107.101.114, 44.32.32.10, ); This is the end. Just another Perl hacker,` [download]	[reply] [d/l]
Re^2: IP addresses? by phroggy (Monk) on Aug 18, 2005 at 17:26 UTC
Ahh, good call - I hadn't thought of removing "for". As for removing @ips, I thought leaving it in would add just a tiny bit of misdirection, making the reader think of IP addresses.... `perl -e '($,,@_)=("er",",\n","l Hack"," P","Just anoth"); print reverse @_;'`	[reply] [d/l]
Re: IP addresses? by 5mi11er (Deacon) on Aug 18, 2005 at 14:32 UTC
Interesting. So, what exactly is perl doing? DB<11> p 74.117.115.116; Just DB<12> p 74; 74 DB<13> p 74.117; 74.117 DB<14> p 74.117.115; Jus DB<15> p 74.117.32.32.44.115; Ju ,s The dot operator is used to concatenate strings together, so as long as it doesn't look like a normal integer or floating point number, it assumes they are "strings", and perl is storing them as single byte integers (characters), rather than, for example, the string "74". When printed, out come their ascii representations. Is this a good description of what's going on internally, or is there some further magic to be explained? -Scott	[reply]
Re^2: IP addresses? by phroggy (Monk) on Aug 18, 2005 at 17:33 UTC
Good observations, but your guesses are completely wrong. See "Version Strings" in perldoc perldata. Looks like support for these is going away after 5.8... `perl -e '($,,@_)=("er",",\n","l Hack"," P","Just anoth"); print reverse @_;'`	[reply] [d/l]
Re^3: IP addresses? by 5mi11er (Deacon) on Aug 19, 2005 at 15:46 UTC
Ah, version strings. I'd forgotten about those. It's a nice side effect that "raw" IP addresses end up getting stored like that. But, is it portable between big and little endian machines? -Scott	[reply]


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