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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Newsgroups: comp.lang.ada
Subject: Re: Quality systems (Was: Using Ada for device drivers? (Was: the
   Ada mandate, and why it collapsed and died))
Date: 20 May 2003 15:54:04 -0400
Organization: The World Public Access UNIX, Brookline, MA
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Vinzent Hoefler <ada.rocks@jlfencey.com> writes:

> Robert A Duff wrote:
> >  Consider the weird
> >semantics of "not" for non-binary modulii.
> 
> Well, you get what you've asked for. :-)

;-)

> Well, let's get an example out of my praxis. I got a kind of random
> lookup table with 15 entries (yes, I know, this is silly, especially
> because speed should have been a main concern when this was written
> first) and I just want to go through that array in circles. So using a
> modular type in that case would be what? Low level? High level?

High level.

> Currently this thing is written in assembly language, but if I'd ever
> reengineer that in Ada I'd definitely use a (non-binary) modular type
> for the index then (and an array with 16 entries instead). Of course,
> as you pointed out, I could do the modulo arithmetic by hand, but why
> if I can let the compiler handle it?

Because it makes the code easier to understand if the "mod" is explicit.

- Bob