From:	martin AT REMOVE_THIS_BITloplop DOT com (Martin Peach)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: sqrt() in DJGPP
Date:	Sun, 22 Feb 1998 16:39:02 -0500
Organization:	LopLop Inc.
Lines:	24
Message-ID:	<martin-2202981639020001@dialup-738.hip.cam.org>
References:	<01bd3da9$a0052120$0cf234d1 AT mpanian DOT awinc DOT com> <34ED4ECB DOT 5A5C0CBC AT LSTM DOT Ruhr-UNI-Bochum DOT De>
NNTP-Posting-Host:	dialup-738.hip.cam.org
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

In article <34ED4ECB DOT 5A5C0CBC AT LSTM DOT Ruhr-UNI-Bochum DOT De>, Thomas Demmer
<demmer AT LSTM DOT Ruhr-UNI-Bochum DOT De> wrote:

> Lucas Panian wrote:
> > 
> > Hi,
> > 
> > When I try to run my program, it crashes with SIGFPE...I used symify to
> > find that it was in the following section of code(all variables are already
> > declared)
> > 
> > A = Y1 * ( Z2 - Z3 ) + Y2 * ( Z3 - Z1 ) + Y3 * ( Z1 - Z2 );
> > B = Z1 * ( X2 - X3 ) + Z2 * ( X3 - X1 ) + Z3 * ( X1 - X2 );
> > C = X1 * ( Y2 - Y3 ) + X1 * ( Y3 - Y1 ) + X3 * ( Y1 - Y2 );
> > 
> > Distance = sqrt (A*A + B*B + C*C);
> > 
> > Normal.X = (A / Distance) + VPoint[0]->Lx;  // It crashes on this line.
Is A a positive number?
Square roots of negative numbers are not defined.
Martin.

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