moijes12 <moije...@gmail.com> wrote: > >I know the value -0 is quite meaningless and makes little sense.But I >was just fiddling.I am unable to figure out the below result > >>>> -0 and True >0 ----------> (Why is this 0 and not say True or False) >>>> -0 and false >0 >>>> -0 or True >True > >Could someone please provide me some resources on how these operations >take place.I'd wanna find it out myself
Actually, there ARE computers where you might not see this result. Virtually all of the processors on which Python runs use two's complement arithmetic. In two's complement, there is no separate value called -0. 0 and -0 have the same bit representation. In one's complement, -0 and 0 have different representations. Having spent 10 years with Control Data (the 6000 and Cyber 70/170 mainframes were all one's complement), I am particularly sensitive to this. Processors are usually architected so that you don't normally see the -0, but it leads you to think about arithmetic a bit differently. -- Tim Roberts, t...@probo.com Providenza & Boekelheide, Inc. -- http://mail.python.org/mailman/listinfo/python-list
