From: Robert A Duff <bobduff@shell01.TheWorld.com>
Subject: Re: Array Help?
Date: Wed, 29 Feb 2012 17:59:24 -0500
Date: 2012-02-29T17:59:24-05:00 [thread overview]
Message-ID: <wcc399ttfeb.fsf@shell01.TheWorld.com> (raw)
In-Reply-To: jilr5h$122g$1@adenine.netfront.net
Jeffrey Carter <spam.jrcarter.not@spam.not.acm.org> writes:
> My 1st programming job, using FORTRAN 66, dealt with tree-ring data. We
> had data from 1600 to 1970. Calculating the correct array index for a
> year was a rich source of bugs for us; if we'd been able to have the
> lower bounds be 1600 rather than 1 life would have been a lot easier.
Indeed. In Ada that would be a constrained array.
I was talking about unconstrained arrays.
There are really two different kinds of arrays: sequences and mappings.
A sequence represented as an array is usually an unconstrained type (but
can be constrained if you know the length), and the index subtype is
almost always a signed integer, and usually starts at 0 or 1.
A mapping represented as an array is almost always constrained,
and the index subtype might be an enumeration, or something like
your 1600..1970 above.
The index type should almost never be modular, especially when
unconstrained.
- Bob
next prev parent reply other threads:[~2012-02-29 22:59 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-28 20:15 Array Help? Will
2012-02-28 20:47 ` Ludovic Brenta
2012-02-28 22:11 ` Simon Wright
2012-02-28 23:09 ` Will
2012-02-29 0:24 ` Adam Beneschan
2012-02-28 20:50 ` Gautier write-only
2012-02-28 21:33 ` Simon Wright
2012-02-29 0:27 ` Adam Beneschan
2012-02-29 8:00 ` Simon Wright
2012-02-29 8:48 ` Simon Wright
2012-02-29 0:22 ` Adam Beneschan
2012-02-29 16:09 ` Robert A Duff
2012-02-29 16:50 ` Ludovic Brenta
2012-02-29 18:24 ` Robert A Duff
2012-02-29 19:45 ` stefan-lucks
2012-02-29 20:45 ` Jeffrey Carter
2012-02-29 21:27 ` stefan-lucks
2012-02-29 23:06 ` Robert A Duff
2012-03-02 13:45 ` stefan-lucks
2012-03-07 23:58 ` Randy Brukardt
2012-03-08 11:20 ` stefan-lucks
2012-03-09 2:02 ` Randy Brukardt
2012-03-09 8:48 ` stefan-lucks
2012-03-09 21:10 ` Randy Brukardt
2012-03-15 2:55 ` BrianG
2012-03-15 7:46 ` stefan-lucks
2012-02-29 20:07 ` Dmitry A. Kazakov
2012-02-29 23:15 ` Robert A Duff
2012-03-01 8:54 ` Dmitry A. Kazakov
2012-03-01 14:06 ` Robert A Duff
2012-02-29 20:47 ` Simon Wright
2012-02-29 22:23 ` Robert A Duff
2012-02-29 23:27 ` Robert A Duff
2012-03-01 0:53 ` Adam Beneschan
2012-03-01 7:16 ` Ludovic Brenta
2012-03-01 14:03 ` Robert A Duff
2012-03-08 0:11 ` Randy Brukardt
2012-03-08 0:08 ` Randy Brukardt
2012-02-29 23:30 ` Simon Wright
2012-02-29 18:35 ` Jeffrey Carter
2012-02-29 22:59 ` Robert A Duff [this message]
2012-02-29 23:51 ` Jeffrey Carter
2012-03-01 3:03 ` Robert A Duff
2012-02-29 20:40 ` Adam Beneschan
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