Path: utzoo!attcan!uunet!husc6!uwvax!tank!uxc!uxc.cso.uiuc.edu!uxg.cso.uiuc.edu!uxe.cso.uiuc.edu!mcdonald
From: mcdonald@uxe.cso.uiuc.edu
Newsgroups: comp.lang.c
Subject: Re: DIV and MOD ( was: Something IBM di
Message-ID: <225800089@uxe.cso.uiuc.edu>
Date: 8 Nov 88 21:48:00 GMT
References: <972@goofy.megatest.UUCP>
Lines: 17
Nf-ID: #R:goofy.megatest.UUCP:972:uxe.cso.uiuc.edu:225800089:000:515
Nf-From: uxe.cso.uiuc.edu!mcdonald    Nov  8 15:48:00 1988



>      -1 >> 1   giving  -1

Odd. Lets see here. In binary  4 bits       1 == 0001b
                                            0 == 0000b

                                           -1 == 1110b
        with zero filling shift    -1 >> 1    == 0111b  == 7
  with sign filling shift          -1 >> 1    == 1111b  == -0

neither of which are == -1. Perhaps you are unfamiliar with this
relatively common method. On some machines -1 >> 1 == -1, but not
all machines - and not necessarily in ANSI C.


:-)   :-)   :-)