Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ulowell!masscomp!ftw
From: ftw@masscomp.UUCP (Farrell Woods)
Newsgroups: comp.lang.c
Subject: Re: value of TRUE???
Keywords: TRUE, if(), another nonzero value
Message-ID: <819@masscomp.UUCP>
Date: 7 Mar 89 20:11:14 GMT
References: <987@infmx.UUCP>
Reply-To: ftw@quasar.masscomp.UUCP (Farrell Woods)
Distribution: usa
Organization: Concurrent Computer Corporation - Westford, Ma
Lines: 23

In article <987@infmx.UUCP> kevinf@infmx.UUCP (Kevin Franden) writes:

>given: 	:The if() statement will evaluate to true provided that
>	 the argument does not evaluate to 0.  (ie a=3; if (a)...)

Expressions have values in C.  Since there is no boolean type in C,
expressions that evaluate to non-zero values are taken as "true",
and zero-valued as "false".

>What does if (a=3) evaluate to?

The expression "a = 3" has the value of 3, which is non-zero and therefore
"true".  Therefore:

	if (a = 3)
		printf("true!\n");

will always execute the printf().
-- 
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