From owner-freebsd-questions  Sat Feb  6 16:57:32 1999
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Date: Sat, 6 Feb 1999 19:57:04 -0500
From: Chris Johnson <cjohnson@palomine.net>
To: Keith Anderson <keith@apcs.com.au>
Cc: questions@FreeBSD.ORG
Subject: Re: math.h ?
Message-ID: <19990206195704.A23866@palomine.net>
References: <XFMail.990207113238.keith@apcs.com.au>
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In-Reply-To: <XFMail.990207113238.keith@apcs.com.au>; from Keith Anderson on Sun, Feb 07, 1999 at 11:32:38AM +1100
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On Sun, Feb 07, 1999 at 11:32:38AM +1100, Keith Anderson wrote:
> HI All,
> 
> Below I have a very simple 'c' program but I can't make it work !! What am I
> doing wrong, it will not compile?
> 
> Any help would be great 
> 
> Thanks 
> 
> Keith
> 
> <snip test.c>
> #include <math.h>
> 
> main ()
> {
> double x = 64;
> double ans;
> ans = sqrt(x);
> 
> printf("ans = %lf\n",ans);
> 
> }
> 
> </snip test.c>
> 
> keith@wis~>cc test.c
> /var/tmp/ccV145121.o: Undefined symbol `_sqrt' referenced from text segment

You've got to link it with libm, like so:

cc -lm test.c

Chris

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