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From: w-colinp@microsoft.UUCP (Colin Plumb)
Newsgroups: comp.lang.c
Subject: Re: value of TRUE???
Message-ID: <825@microsoft.UUCP>
Date: 7 Mar 89 20:10:13 GMT
References: <987@infmx.UUCP>
Reply-To: w-colinp@microsoft.uucp (Colin Plumb)
Distribution: usa
Organization: very little
Lines: 20

Sigh, this went around a few short weeks ago...

When a C operator returns a truth value (these operators are
==, !=, <, > , <=, >=, !, &&, || and defined()), the result is
of type int and has the value 0 (for false) or 1 (for true).

When a C operator takes a truth value (!, &&, ||, ? :, if(),
if() else, while(), do while(), and for(;;), and #if), the
value must be comparable to 0 (i.e. int, float, pointer, etc.)
and if it is non-zero, it is considered to be true.

An if() statement does not return a value, so I don't quite understand
that part of the original question.  if(i=3)... is equivalent to
i=3; if(i)... (assuming i isn't a macro).  If i is 2 bits or wider,
this is equivalent to i=3; if(3)... which is equivalent to i=3; if(1)...
(or if(0.0001)... or if(&i)... or if(-1)...).
-- 
	-Colin (uunet!microsoft!w-colinp)

"Don't listen to me.  I never do." - The Doctor