Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer
 
PerlMonks  

packing and unpacking

by ungalnanban (Pilgrim)
on Mar 12, 2010 at 09:15 UTC ( #828246=perlquestion: print w/ replies, xml ) Need Help??
ungalnanban has asked for the wisdom of the Perl Monks concerning the following question:

Hi, I want to get output as 0x23400000345....
in the below example
How to get?
i tried out, but unable to get the answer

$r=0x234; $t=0x345; $y=pack('L L',$t,$r); $x1=unpack('L!',pack('P',$y)); printf("\nThe value is $x1");

I didn't get constant output

--sugumar--

Comment on packing and unpacking
Download Code
Re: packing and unpacking
by almut (Canon) on Mar 12, 2010 at 09:40 UTC
    my $r = 0x234; my $t = 0x345; my $y = pack('L L', $t, $r); my $x1 = unpack('Q', $y); printf "\nThe value is 0x%x", $x1; # 0x23400000345

    (in case you have a 64-bit perl)


      I don't know the 64-bit Perl.
      whether you are mentioning 64-bit processor or ...?

      I am using Perl version 5.8.8

      I ran the given code It shows the following error.
      Invalid type 'Q' in unpack at pack.pl line 9.
      --$ugum@r--
        From perldoc -f pack:
        Q An unsigned quad value. (Quads are available only if your system supports 64-bit integer values _and_ if Perl has been compiled to support those. Causes a fatal error otherwise.)

        (($_="Mzz ojjdloobnf jt uvy5502383")=~y~b-zg2-5c96-81~a-z0-9~s)=~s~~~s; print

        You could also simply try

        my $x1 = $r << 32 | $t; printf "\nThe value is 0x%x", $x1; # 0x23400000345

        (though whether this works similarly depends of the build options of your perl)

        P.S.: What exactly do you need this for?  Maybe bigint or Math::BigInt would help.

        Update:

        use bigint; my $r = 0x234; my $t = 0x345; my $x1 = $r << 32 | $t; print $x1->as_hex;

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: perlquestion [id://828246]
Approved by almut
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others exploiting the Monastery: (18)
As of 2014-08-22 16:56 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The best computer themed movie is:











    Results (161 votes), past polls