Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot

Hex to decimal

by Ras (Acolyte)
on Apr 26, 2001 at 00:27 UTC ( #75607=perlquestion: print w/replies, xml ) Need Help??
Ras has asked for the wisdom of the Perl Monks concerning the following question:

How can i convert a hex to a short signed decimal? For example: Convert hex AA into dec -86. How can i do this using perl?

Replies are listed 'Best First'.
(tye)Re: Hex to decimal
by tye (Sage) on Apr 26, 2001 at 01:06 UTC

    See hex.

    my $hex= "FFAA"; my $unsigned= hex($hex); my $signed= $unsigned; $signed -= 0x10000 if $signed & 0x8000;

            - tye (but my friends call me "Tye")
Re: Hex to decimal
by busunsl (Vicar) on Apr 26, 2001 at 00:28 UTC
    Have a look at the unpack function.

    perdoc -f unpack

      I'm sorry i made an mistake i want to convert hex FFAA into dec -86. How can i do this using perl and please can you show me some syntax?

        D:\Perl\dl>perl -e "print unpack('s',pack 's', hex('ffaa'))" -86
        • takes the string 'ffaa' and makes a decimal value with hex
        • packs that value into a signed short
        • unpacks that structure as a signed short
        • and prints it

        I'd like to be able to assign to an luser

        $signed = (hex(ffaa)^0x8000)-0x8000;
Re: Hex to decimal
by turnstep (Parson) on Apr 26, 2001 at 00:31 UTC

    Don't forget the online documentation here at perlmonks too: you can add an instant unpack and even a pack link to your replies. :)

Re: Hex to decimal
by TeKk9 (Scribe) on Apr 26, 2001 at 00:46 UTC
    You can try a sprintf ie.
    $num = "AA"; $dec_num = sprintf("%d", hex($num)); print "$dec_num\n";

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: perlquestion [id://75607]
Approved by root
and all is quiet...

How do I use this? | Other CB clients
Other Users?
Others having an uproarious good time at the Monastery: (2)
As of 2017-01-18 04:26 GMT
Find Nodes?
    Voting Booth?
    Do you watch meteor showers?

    Results (160 votes). Check out past polls.