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From: volpe@camelback.crd.ge.com (Christopher R Volpe)
Newsgroups: comp.lang.c
Subject: Re: Expressions in initializers
Message-ID: <17294@crdgw1.crd.ge.com>
Date: 4 Mar 91 21:14:29 GMT
References: <17270@crdgw1.crd.ge.com> <760@ajpo.sei.cmu.edu> <1991Mar4.144939.8311@ux1.cso.uiuc.edu>
Sender: news@crdgw1.crd.ge.com
Reply-To: volpe@camelback.crd.ge.com (Christopher R Volpe)
Lines: 19

In article <1991Mar4.144939.8311@ux1.cso.uiuc.edu>,
mcdonald@aries.scs.uiuc.edu (Doug McDonald) writes:
|>sqrt(2.0) is an expression. It CAN be evaluated at compile time. Perhaps
|>some people don't want to write compilers that do that (i.e. they are too
|>lazy), but it most certainly CAN be evaluated.

"The square root of two" can be evaluated at compile time, but "sqrt(2.0)"
is an invocation of a function. How is the compiler supposed to know
what sqrt is? I could have in another file:

double sqrt(double x)
{
  return x - 1.0;
}
                              
==================
Chris Volpe
G.E. Corporate R&D
volpecr@crd.ge.com