in reply to packing and unpacking

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

[download]

(in case you have a 64-bit perl)

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Re^2: packing and unpacking
by ungalnanban (Pilgrim) on Mar 12, 2010 at 10:00 UTC

    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--
[reply]

      You could also simply try 

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

      [download]

      (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;

      [download]
[reply]
[d/l]
[select]


        while(1)
        {
        print"Thankyou...."
        }
        --$ugum@r--
[reply]
      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.)

      [download]

      (($_="Mzz ojjdloobnf jt uvy5502383")=~y~b-zg2-5c96-81~a-z0-9~s)=~s~~~s; print
[reply]
[d/l]
        I know that "perldoc -f pack"
        why it shows this error "Invalid type 'Q' "?

        --$ugum@r--
[reply]

In Section Seekers of Perl Wisdom