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From: darrelj@sdcrdcf.UUCP (Darrel VanBuer)
Newsgroups: net.lang
Subject: Re: language supporting (x<y<z)
Message-ID: <3083@sdcrdcf.UUCP>
Date: Wed, 15-Oct-86 17:34:07 EDT
Article-I.D.: sdcrdcf.3083
Posted: Wed Oct 15 17:34:07 1986
Date-Received: Thu, 16-Oct-86 02:21:52 EDT
References: <1822@bu-cs.bu-cs.BU.EDU> <203@sas.UUCP>
Reply-To: darrelj@sdcrdcf.UUCP (Darrel VanBuer)
Organization: System Development Corporation R&D, Santa Monica
Lines: 16

In PL/I, a<b<c is a legal expression, but doesn't mean (a<b)&(b<c); it means
compare a<b, yielding a BIT(1) which is 1 or 0 for True/false; coerce the
bit to a number (0 or 1) and compare to c.  Thus 4<5<2 is true and -2<-1<0
is false!
A cautionary tale in the confused world of real programming languages from
...

-- 
Darrel J. Van Buer, PhD
System Development Corp.
2525 Colorado Ave
Santa Monica, CA 90406
(213)820-4111 x5449
...{allegra,burdvax,cbosgd,hplabs,ihnp4,orstcs,sdcsvax,ucla-cs,akgua}
                                                            !sdcrdcf!darrelj
VANBUER@USC-ECL.ARPA