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From: schmidt@mars.jpl.nasa.gov (Kevin Schmidt)
Newsgroups: comp.lang.c
Subject: Re: unsigned/signed mismatch in MSC 6.0
Message-ID: <1990Nov13.235654.15498@jato.jpl.nasa.gov>
Date: 13 Nov 90 23:56:54 GMT
References: <2301@sparko.gwu.edu>
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Reply-To: schmidt@mars.UUCP (Kevin Schmidt)
Organization: Jet Propulsion Laboratory, Pasadena, CA.
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In article <2301@sparko.gwu.edu> timur@seas.gwu.edu () writes:
>I'm using Microsoft C 6.0, and I have my warnings set to level 4.  I'm
>getting an error with this expression:
>
>strlen(s)<WIDTH
>
>where WIDTH is defined as some expression including an integer.  I don't
>exactly understand the error I get (C4018 '<' : signed/unsigned mismatch), 
>but it looks as if it knows that WIDTH is a signed integer and strlen() 
>returns an unsigned, and the two don't match.  The problem is that WIDTH 
>uses an integer variable from an include file which I can't modify.
>
Instead of casting the expression in the #define, cast it when you use it.
i.e.

	strlen(s) < (unsigned)WIDTH

This should fix your warning.

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