From: Adrian Hoe <mailbox@nospam.adrianhoe.com.my>
Subject: Re: float with 24-bit resolution
Date: Mon, 18 Aug 2003 13:05:34 +0800
Date: 2003-08-18T13:05:34+08:00 [thread overview]
Message-ID: <3f405ef4$1_1@news.tm.net.my> (raw)
In-Reply-To: <Zas%a.5307$7z1.3683@newsread3.news.pas.earthlink.net>
Matthew Heaney wrote:
> "Simon Wright" <simon@pushface.org> wrote in message
> news:x7vy8xuu235.fsf@smaug.pushface.org...
>
>>"Jeffrey Creem" <jeff@thecreems.com> writes:
>>
>>You need to use the compiler's inbuilt infinite precision arithmetic here:
>>
>>package Angles is
>>
>> Angle_Delta : constant := 360.0 / 2 ** 23;
>>
>> type Angle is delta Angle_Delta range -360.0 .. 360.0 - Angle_Delta;
>> for Angle'Small use Angle_Delta;
>> for Angle'Size use 24;
>>
>>end Angles;
>
>
> This is correct, except that you don't need to subtract the value of
> Angle_Delta when specifying the Angle'Last. The following declaration is
> perfectly correct:
>
> Angle_Delta : constant := 360.0 / 2 ** 23;
> type Angle is delta Angle_Delta range -360.0 .. 360.0; --360, not
> 360-T'Small
> for Angle'Small use Angle_Delta;
> for Angle'Size use 24;
>
>
>
But subtracting the value of Angle_Delta makes the code more
understandable, doesn't it? That translates to -360.0000000 .. +359.9999571.
next prev parent reply other threads:[~2003-08-18 5:05 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-15 11:59 float with 24-bit resolution mailbox
2003-08-15 12:24 ` Jeffrey Creem
2003-08-15 12:52 ` Adrian Hoe
2003-08-15 12:54 ` Adrian Hoe
2003-08-15 15:01 ` Jeffrey Creem
2003-08-16 15:29 ` Matthew Heaney
2003-08-15 13:39 ` Mark Johnson
2003-08-15 16:56 ` Robert I. Eachus
2003-08-15 18:08 ` Mark Johnson
2003-08-16 3:30 ` Robert I. Eachus
2003-08-18 13:39 ` Mark Johnson
2003-08-20 21:12 ` Robert I. Eachus
2003-08-21 13:38 ` Mark Johnson
2003-08-16 15:32 ` Matthew Heaney
2003-08-16 15:26 ` Matthew Heaney
2003-08-15 19:56 ` Simon Wright
2003-08-16 4:21 ` Adrian Hoe
2003-08-16 12:59 ` Jeffrey Creem
2003-08-16 15:35 ` Matthew Heaney
2003-08-17 11:40 ` Simon Wright
2003-08-17 13:46 ` Matthew Heaney
2003-08-18 5:05 ` Adrian Hoe [this message]
2003-08-18 13:14 ` Matthew Heaney
2003-08-19 3:09 ` Adrian Hoe
2003-08-19 13:00 ` Matthew Heaney
2003-08-30 5:02 ` Randy Brukardt
2003-09-02 16:05 ` Adrian Hoe
2003-09-03 3:31 ` Matthew Heaney
2003-09-03 20:46 ` Simon Wright
2003-09-04 1:43 ` Randy Brukardt
2003-09-04 9:53 ` Jean-Pierre Rosen
2003-09-05 3:46 ` Randy Brukardt
2003-09-05 17:16 ` Warren W. Gay VE3WWG
2003-09-05 19:37 ` Randy Brukardt
2003-09-06 20:48 ` Warren W. Gay VE3WWG
2003-09-08 7:53 ` Dmitry A. Kazakov
2003-09-04 1:45 ` Randy Brukardt
2003-08-16 3:42 ` Robert I. Eachus
2003-08-16 15:38 ` Matthew Heaney
2003-08-16 16:36 ` Robert I. Eachus
2003-08-16 15:22 ` Matthew Heaney
2003-08-17 11:46 ` Simon Wright
2003-08-18 10:04 ` Martin Dowie
2003-08-20 19:53 ` Robert I. Eachus
2003-08-20 23:36 ` Ludovic Brenta
2003-08-21 13:54 ` Mark Johnson
2003-08-21 14:35 ` Ludovic Brenta
2003-08-22 14:07 ` Mark Johnson
2003-08-22 15:12 ` Jean-Pierre Rosen
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