MOO-cows Mailing List Archive
floating point support (was Re: suspend())
Date: Mon, 29 Jan 1996 13:50:17 PST
From: Roger Crew <email@example.com>
Encoding: 33 TEXT
> (I just have to finish integrating HPA's floating-point support,
> a task which is going well and is more than half done.)
[...since I don't know exactly what's in HPA's floating-point support,
I'll just insert a random plea and/or hope that HPA did it right...]
Whatever you do, please do *NOT* put in implicit coercions.
For example, in
a = 5.0;
b = 3;
c = a / b;
the third line should be throwing an error. It may seem convenient to have
an implicit coercion in there, but in the long run this will lead to
code with truncations silently occurring where you least expect them.
People seem to have this idea that, because integers can be viewed as a
of the reals, that integers, as a datatype, should be a subTYPE of the
datatype, and it just ain't so... (capsule summary: it's not the sets of
that matters so much as the sets of OPERATIONS that you want to be able to
sin is not a sensible operation to use on integers ($trig_utils
nor is % a sensible operation to use on floats; end of story).
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