my $n1 = '-933';
my $n2 = '-1039';

my $dif = $n1 - $n2;
print $dif . "\n";

##</code><code>##

C:> perl -v
This is perl, v5.8.8 built for MSWin32-x86-multi-thread
(with 50 registered patches, see perl -V for more detail)

Binary build 820 [274739] provided by ActiveState