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From: mcdonald@aries.scs.uiuc.edu (Doug McDonald)
Newsgroups: comp.lang.fortran
Subject: Re: style--- REAL comparisons
Message-ID: <1990Aug4.173025.15920@ux1.cso.uiuc.edu>
Date: 4 Aug 90 17:30:25 GMT
Sender: usenet@ux1.cso.uiuc.edu (News)
Reply-To: mcdonald@aries.scs.uiuc.edu (Doug McDonald)
Organization: School of Chemical Sciences, Univ. of Illinois at Urbana-Champaign
Lines: 20


I just thought of one good - very good - use of compariaons of
real variables for equality:

THIS IS PSEUDOCODE, folks, - bugs guaranteed, you get the idea :

       real function power(a,b)
       if (b .eq. 1.) then
           power = a
       else if( b .eq. 0.) then
           power = 1.
       else if( b .eq. 0.5) then
           power = sqrt(a)
       else
           (use log and exp)

There ARE good uses for such things. People who say NEVER use
equality comparisons on reals are just being silly.

Doug McDonald