From: Paul Brannan <pbrannan@...>
Date: 2002-10-26T04:57:29+09:00
Subject: Re: How come true, false don't support <=> (comparison) operator?

On Sat, Oct 26, 2002 at 03:43:21AM +0900, Austin Ziegler wrote:
> Actually, in C, that's not necessarily the case. 'false' is integer
> 0, whereas true is *properly* defined as !0 -- which may be either
> one (0x00000001) or -1 (0xFFFFFFFF). Now, if truth is measured
> exclusively with unsigned values, then false < true is always true
> -- but with signed values, that's not necessarily the case.

I've never read C89, but C99 requires that all boolean operators output
0 for false and 1 for true.  It becomes confusing because these same
operators are required to treat as true all non-zero values they take as
input.

Paul