Linux x86 box :
corion@samson > perl -v 
This is perl, version 5.005_02 built for i586-linux

blah blah

corion@samson >perl -w test.pl
Argument "0x1" isn't numeric in add at test.pl line 4.
01: 1
Argument "0x2" isn't numeric in add at test.pl line 4.
02: 1
Argument "0x3" isn't numeric in add at test.pl line 4.
03: 1.5
Argument "0x4" isn't numeric in add at test.pl line 4.
04: 1
... etc ...

corion@samson:~ > perl -e "print "0x30"+0;"
48corion@samson:~ >

##</code><code>##

F:\>perl -e "print "0x30"+0;"
48