Re: Pytanie o znaczenie "0xffff & system"

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Article #52268

#52268

From: Marcin Kalinski
Date: Sun, 17 Jul 2011 09:59

29 lines
1718 bytes

W dniu 17.07.2011 11:14, Scottie pisze:
> Hej!
> W jednym skrypcie znalazlem takie oto wywolanie:
> ----------------8<----------------
> if ($file_only ne "true")
>        {
>          $rc = 0xffff&  system("${ORACLE_HOME}/bin/sqlplus -silent
> $rep_user/$rep_pwd@\"$rep_alias\" \@$outfile");
>          $rc>>= 8;
>          return $rc;
>        }
> ----------------8<----------------
>
> Czy ktos moglby mnie oswiecic, co oznacza zwlaszcza to wyrazenie:
> "0xffff&  system"? Co tu robi i do czego sluzy ten kod szesnastkowy?
> Nastepna linia tez jest ciekawa: "$rc>>= 8;", ale tez nie rozumiem
> jej znaczenia... :-/
>
> Z gory wielkie dzieki!
>
> Pzdr,
> --
> Scottie

poczytaj o operatorach binarnych


-- 
Marcin 'bcn' Kalinski

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Path: mbox-mo1.pugleaf.net!news-archive.icm.edu.pl!news.gazeta.pl!not-for-mail
From: Marcin Kalinski <kalinsma@gmail.com>
Newsgroups: pl.comp.lang.perl
Subject: Re: Pytanie o znaczenie "0xffff & system"
Date: Sun, 17 Jul 2011 11:59:42 +0200
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