From: Simon Wright <simon@pushface.org>
Subject: Re: type declaration and storage requirements
Date: 04 Jun 2002 11:35:40 +0100
Date: 2002-06-04T11:35:40+01:00 [thread overview]
Message-ID: <x7vptz79vr7.fsf@pushface.org> (raw)
In-Reply-To: bebbba07.0206021321.a3bbfac@posting.google.com
18k11tm001@sneakemail.com (Russ) writes:
> Suppose I have a particular range in mind, and I just want to get
> the maximum number of digits I can get for, say, a 32-bit word. Is
> there a simple way to determine how many digits to specify? If I
> specify one digit too many, can it step the storage requirement from
> one to two words? I'm no expert, but it seems to me that what you
> really want to be able to specify is not the number of digits but
> rather the total number of bytes to be used.
If your requirement is to specify a size for the values, say
type My_Short_Float_Type is new Float;
type My_Long_Float_Type is new Long_Float;
or
subtype My_Short_Float_Type is Float;
subtype My_Long_Float_Type is Long_Float;
which are pretty likely to map to C float and double.
If on the other hand your requirement is to specify the precision your
algorithm requires, you really do need
type My_Float_Type is digits 7;
and if it turns out that that needs 8 bytes (ie double), so be it.
next prev parent reply other threads:[~2002-06-04 10:35 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-02 21:21 type declaration and storage requirements Russ
2002-06-02 23:54 ` martin.m.dowie
2002-06-03 0:40 ` Dale Stanbrough
2002-06-03 11:10 ` martin.m.dowie
2002-06-04 2:40 ` Dale Stanbrough
2002-06-03 6:58 ` Russ
2002-06-03 7:57 ` AG
2002-06-03 11:19 ` martin.m.dowie
2002-06-03 12:40 ` Larry Kilgallen
2002-06-03 13:12 ` Gautier
2002-06-03 2:26 ` Jeffrey Carter
2002-06-04 10:35 ` Simon Wright [this message]
2002-06-04 13:04 ` Martin Dowie
2002-06-06 8:06 ` Simon Wright
2002-06-11 7:18 ` David Thompson
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