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From: ag0@k.cc.purdue.edu.UUCP
Newsgroups: comp.lang.c
Subject: Re:  Help in dealing with floating point exceptions in C on UNIX/VAX
Message-ID: <1800@k.cc.purdue.edu>
Date: Tue, 17-Feb-87 16:05:14 EST
Article-I.D.: k.1800
Posted: Tue Feb 17 16:05:14 1987
Date-Received: Fri, 27-Feb-87 03:44:22 EST
References: <4441@brl-adm.ARPA> <635@sdchema.sdchem.UUCP>
Reply-To: ag0@k.cc.purdue.edu.UUCP (Colin Jenkins)
Organization: Purdue University Computing Center
Lines: 35
Summary: Try signal

In article <635@sdchema.sdchem.UUCP> tps@sdchemf.UUCP (Tom Stockfisch) writes:
>In article <4441@brl-adm.ARPA> moss@BRL.ARPA (Gary S. Moss (SLCBR-VLD-V)) writes:
>>See matherr(3M).
>>-moss
>
>What system are you on?
>I can't find this in either my 4.3BSD or Sys V Manual.
>
>|| Tom Stockfisch, UCSD Chemistry	tps%chem@sdcsvax.UCSD

I can't find on my 4.3 system either.  I would suggest using the signal
handler.  You can write a function to be called when a floating point
exception occurs and handle it there.

#include <signal.h>

int	trapfpe();

main {
    signal (SIGFPE, trapfpe);
    .
    .
    }  /* main */

trapfpe()
{
    printf ("trapfpe: ERROR- Floating point exeption\n");
    /****** Handle the error *******/
    }  /* trapfpe */

My usage of the signal facility is a little bit different from the manual
description (which may be confusing to new programmers), but it is simple 
and it works.

			Colin