Here's a Math::BigInt solution.

`#!/usr/bin/perl
use strict;
use warnings;
use Math::BigInt;
$_ = "DEADBEEFBABEFACE1234567890";
my $num = Math::BigInt -> new (0);
# Convert the number to a Math::Int decimal number.
while (length) {
my $chunk = substr $_, 0, 4, "";
$num *= 2 ** (4 * length $chunk);
$num += hex $chunk;
}
# Multiply by 2, add 1.
$num *= 2;
$num += 1;
# Convert the Math::BigInt number to hex.
my @a;
while ($num) {
push @a => sprintf "%X" => $num % 16;
$num /= 16;
}
my $new = join "" => @a;
print $new, "\n";
`

And here's an Inline::BC solution:

`#!/usr/bin/perl
use strict;
use warnings;
use Inline 'BC';
print x("DEADBEEFBABEFACE1234567890");
__DATA__
__BC__
ibase = 16
obase = 10
define x (a) {
return (a * 2 + 1)
}
`

Abigail

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