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From: gwyn@BRL.ARPA (VLD/VMB)
Newsgroups: net.lang.c
Subject: Re:  How to test for +/- INFINITY, etc. i
Message-ID: <1155@brl-tgr.ARPA>
Date: Wed, 1-Jan-86 05:00:30 EST
Article-I.D.: brl-tgr.1155
Posted: Wed Jan  1 05:00:30 1986
Date-Received: Thu, 2-Jan-86 04:47:41 EST
Sender: news@brl-tgr.ARPA
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On UNIX System V, /usr/include/nan.h includes a definition of
NaN(X) for testing whether X is a Not-a-Number, and KILLNaN(X)
to generate a SIGFPE if X ditto.  If you're going to invent
macros, please follow this existing model rather than diverge.