On Thu, Feb 12, 2009 at 4:03 PM, David Cantrell <da...@cantrell.org.uk> wrote: > On Thu, Feb 12, 2009 at 03:30:22PM +0000, James Laver wrote: > >> Although by rights it should be -1 on a twos complement machine. >> (For those who remember ones complement based numbers, or even know >> they existed). > > You're confusing logical not with bit-wise not: > > $ perl -e 'print "".(!0)."\n"' > 1 > $ perl -e 'print "".(~0)."\n"' > 4294967295 <-- 32-bit -1 > $ perl64 -e 'print "".(~0)."\n"' > 18446744073709551615 <-- 64-bit -1 >
Okay, I may be stretching things a little far for comparatively crap humour, but I am aware of the difference. In any case, it wasn't funny, I'll drop it. --James
