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From: gwyn@smoke.brl.mil (Doug Gwyn)
Newsgroups: comp.lang.c
Subject: Re: Hexadecimal/octal constants
Message-ID: <15530@smoke.brl.mil>
Date: 20 Mar 91 21:51:05 GMT
References: <RJOHNSON.91Mar20091144@olorin.shell.com>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
Lines: 17

In article <RJOHNSON.91Mar20091144@olorin.shell.com> rjohnson@shell.com (Roy Johnson) writes:
>Is it true on every platform that 0xf == 15?

Yes.

>Is it also true on every platform that for bitwise operations, C
>behaves as if it is on a two's complement machine, ...

No.

>... so that, e.g., the
>result of 0xf & 0x2 is 0x2, even if the machine representation of
>0xf is 1010 and 0x2 is 0101 [think hypothetical here 8^)]?

The bitwise operations are carefully specified in the C standard
to have the "right" properties.  However, twos complement has
nothing to do with this.