Prepend '0x' to the string and it will maintain its numeric value.
#!/usr/bin/perl
use strict;
no warnings 'numeric';
my $this = sprintf("0x%x", 40);
my $that = sprintf("0x%x", 2);
my $other = $this + $that;
printf "$other %x\n", $other;
__END__
42 2a
Update: Added no warnings for the -w happy...
Update: This is perl, v5.6.0 built for i386-linux
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