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From: rjc@uk.ac.ed.cstr (Richard Caley)
Newsgroups: comp.lang.c
Subject: Re: Expressions in initializers
Message-ID: <RJC.91Mar5195414@brodie.uk.ac.ed.cstr>
Date: 5 Mar 91 19:54:14 GMT
References: <17270@crdgw1.crd.ge.com> <760@ajpo.sei.cmu.edu>
	<1991Mar4.144939.8311@ux1.cso.uiuc.edu>
	<1991Mar5.042141.21825@grebyn.com>
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In-reply-to: ckp@grebyn.com's message of 5 Mar 91 04:21:41 GMT

In article <1991Mar5.042141.21825@grebyn.com>, Checkpoint Technologies (ct) writes:

In article <1991Mar4.144939.8311@ux1.cso.uiuc.edu> mcdonald@aries.scs.uiuc.edu (Doug McDonald) writes:

dmd> sqrt(2.0) is an expression. It CAN be evaluated at compile time.
dmd> Perhaps some people don't want to write compilers that do that
dmd> (i.e.  they are too lazy), but it most certainly CAN be
dmd> evaluated.

ct> You are assuming that the compiler knows what the function sqrt(double)
ct> does.  I think I've heard of a few that do.  Most don't.

Is it possible to know before the program is linked (run if you have
run time linking!). What stops me from defining my own sqrt?

--
rjc@cstr.ed.ac.uk