On Wed, Jul 27, 2005 at 03:43:19PM -0700, Piotr Fusik wrote: > The result of the unary minus operator, when applied to > an undefined value (e.g. undefined variable) is unexpected: > > perl -le 'print for -0,-"",-0.0,-undef' > 0 > 0 > -0 > -0 > > In my opinion, -undef should be identical to -"", i.e. 0, not -0.0.
I'd say -0 but same end result. -0 and -undef should probably produce the same thing. $ perl -MDevel::Peek -wle 'print Dump -undef' Use of uninitialized value in negation (-) at -e line 1. SV = NV(0x80de00) at 0x801270 REFCNT = 1 FLAGS = (PADTMP,NOK,pNOK) NV = -0 $ perl -MDevel::Peek -wle 'print Dump -0'SV = IV(0x80b520) at 0x801270 REFCNT = 1 FLAGS = (PADBUSY,PADTMP,IOK,READONLY,pIOK) IV = 0 Not that it really makes much difference but its curious why undef is being numerified as an NV. -- Michael G Schwern [EMAIL PROTECTED] http://www.pobox.com/~schwern Reality is that which, when you stop believing in it, doesn't go away. -- Phillip K. Dick
