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From: faustus@ucbcad.BERKELEY.EDU@ndmce.uucp (Wayne A. Christopher)
Newsgroups: net.lang
Subject: Re: ReExplanation of (x<y<z)
Message-ID: <341@ndmce.uucp>
Date: Fri, 17-Oct-86 17:09:43 EDT
Article-I.D.: ndmce.341
Posted: Fri Oct 17 17:09:43 1986
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In article <7871DMB@PSUVMA>, dmb@psuvm.bitnet.UUCP writes:
>    Sorry I guess the question wasn't which languages support it, but why
> most of the major ones don't?

I think it is a matter of clean expression semantics -- 'x < y' has a value
which is a boolean, and so '(x < y) < z' doesn't mean what it should mean.
Another (tertiary) operator would do the job, as would

#define between(x, y, z) (((x) < (y)) && ((y) < (z)))

but I imagine that for the languages that do allow x < y < z, a large reason
why they aren't 'major' is that they are careless of semantic clarity and
orthagonality.

	Wayne