Received: (at 79759) by debbugs.gnu.org; 4 Nov 2025 12:28:57 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Nov 04 07:28:57 2025 Received: from localhost ([127.0.0.1]:47235 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1vGG9g-00050F-N9 for submit <at> debbugs.gnu.org; Tue, 04 Nov 2025 07:28:57 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:49802) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1vGG9e-000500-5F for 79759 <at> debbugs.gnu.org; Tue, 04 Nov 2025 07:28:55 -0500 Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1vGG9Y-0002gl-Hs; Tue, 04 Nov 2025 07:28:48 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=ogpDHPp1a2UtCqmhJqka0jfhUQ+pkG8Fpa0FeM6mhT0=; b=G/Y6fceY99b7 Qybe4roxFYmfqqNU3l69YPRPo8S7lKKOdTeanLW92tVPUbnMJBJHhfEJCYPHkAXzFEaNPp8ojm8WA jpw91tf1kWB/qjubODM9W3JK9slregDexWeq6TOhk1sRMgMpB4c5twnGwF0xdgzecPaXbZZHeJfAS 8G1kTpcHRoKjwFNbPB2eICD14gjjQYpjDUH9pSLl1hq5yZ+fezscnL7hnh5QZDSlSogbT5DTVuXl9 g4a8UDPrHr8Q4DWKsaVUcTH+OjlNtXSReJAvEjjI7yLa5GFdMTDoRaFnAEoIzgePa6TcY/DwLgOPY fiXk0/m/HFMUInPnJ5UdOg==; Date: Tue, 04 Nov 2025 14:28:38 +0200 Message-Id: <86o6pif0cp.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Andreas Schwab <schwab@HIDDEN> In-Reply-To: <mvmy0omi9dj.fsf@HIDDEN> (message from Andreas Schwab on Tue, 04 Nov 2025 07:45:28 +0100) Subject: Re: bug#79759: 30.2; unexpected result for integer division in Calc References: <87y0ons677.fsf@HIDDEN> <mvmseevjpby.fsf@HIDDEN> <87tszbs1g2.fsf@HIDDEN> <mvmjz07jkhj.fsf@HIDDEN> <87pl9zrzpx.fsf@HIDDEN> <mvmfravjjcp.fsf@HIDDEN> <877bw7b2iu.fsf@HIDDEN> <mvmbjljjgq8.fsf@HIDDEN> <868qgngmm5.fsf@HIDDEN> <mvm7bw7jfjd.fsf@HIDDEN> <867bw7gk38.fsf@HIDDEN> <mvmy0omi9dj.fsf@HIDDEN> X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 79759 Cc: rpluim@HIDDEN, 79759 <at> debbugs.gnu.org, nicolas@HIDDEN X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) > From: Andreas Schwab <schwab@HIDDEN> > Cc: rpluim@HIDDEN, 79759 <at> debbugs.gnu.org, nicolas@HIDDEN > Date: Tue, 04 Nov 2025 07:45:28 +0100 > > On Nov 03 2025, Eli Zaretskii wrote: > > > I see neither the 12-digit accuracy > > That is only relevant for /. And documented where? > > nor the special handling of negative integers/numbers described. > > There is no special handling, it is inherent in the definition of floor. If it's inherent, then why did you say > > I am talking about *integer* division (hence "\" and not "/"). > > That only works for non-negative integers. up-thread?
bug-gnu-emacs@HIDDEN:bug#79759; Package emacs.
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[188.150.186.155]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-37a415c82b4sm2310601fa.34.2025.11.03.12.11.35 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 03 Nov 2025 12:11:36 -0800 (PST) From: =?utf-8?Q?Mattias_Engdeg=C3=A5rd?= <mattias.engdegard@HIDDEN> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.120.0.1.15\)) Subject: bug#79759: 30.2; unexpected result for integer division in Calc Message-Id: <B7020DC1-C704-44D1-B275-70CDB87069CA@HIDDEN> Date: Mon, 3 Nov 2025 21:11:35 +0100 To: Eli Zaretskii <eliz@HIDDEN> X-Mailer: Apple Mail (2.3654.120.0.1.15) X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 79759 Cc: Andreas Schwab <schwab@HIDDEN>, Robert Pluim <rpluim@HIDDEN>, 79759 <at> debbugs.gnu.org, nicolas@HIDDEN X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) > The =E2=80=98\=E2=80=99 (=E2=80=98calc-idiv=E2=80=99) command = divides two numbers on the stack to > produce an integer result. It is equivalent to dividing with = =E2=80=98/=E2=80=99, then > rounding down with =E2=80=98F=E2=80=99 (=E2=80=98calc-floor=E2=80=99),= only a bit more convenient and > efficient. Also, since it is an all-integer operation when the > arguments are integers, it avoids problems that =E2=80=98/ F=E2=80=99 = would have with > floating-point roundoff. As far as can tell, '\' works as documented: it rounds down. For = negative values, that means towards negative infinity. It's a perfectly reasonable way of implementing integer division and one = that in many ways makes more sense than the perhaps more common = truncating division, that rounds towards 0. In elisp, corresponding operations are `floor` and `mod`, not `/` and = `%`.
bug-gnu-emacs@HIDDEN:bug#79759; Package emacs.
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Date: Mon, 03 Nov 2025 18:24:43 +0200
Message-Id: <867bw7gk38.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Andreas Schwab <schwab@HIDDEN>
In-Reply-To: <mvm7bw7jfjd.fsf@HIDDEN> (message from Andreas Schwab on Mon, 03
Nov 2025 16:34:46 +0100)
Subject: Re: bug#79759: 30.2; unexpected result for integer division in Calc
References: <87y0ons677.fsf@HIDDEN> <mvmseevjpby.fsf@HIDDEN>
<87tszbs1g2.fsf@HIDDEN> <mvmjz07jkhj.fsf@HIDDEN>
<87pl9zrzpx.fsf@HIDDEN> <mvmfravjjcp.fsf@HIDDEN>
<877bw7b2iu.fsf@HIDDEN> <mvmbjljjgq8.fsf@HIDDEN>
<868qgngmm5.fsf@HIDDEN> <mvm7bw7jfjd.fsf@HIDDEN>
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> From: Andreas Schwab <schwab@HIDDEN>
> Cc: rpluim@HIDDEN, 79759 <at> debbugs.gnu.org, nicolas@HIDDEN
> Date: Mon, 03 Nov 2025 16:34:46 +0100
>
> On Nov 03 2025, Eli Zaretskii wrote:
>
> > I couldn't find it, FWIW. I looked under the description of '/' and
>
> This is about \, not /.
Yes, seen that as well. Here it is, all of it:
The ‘\’ (‘calc-idiv’) command divides two numbers on the stack to
produce an integer result. It is equivalent to dividing with ‘/’, then
rounding down with ‘F’ (‘calc-floor’), only a bit more convenient and
efficient. Also, since it is an all-integer operation when the
arguments are integers, it avoids problems that ‘/ F’ would have with
floating-point roundoff.
I see neither the 12-digit accuracy nor the special handling of
negative integers/numbers described.
bug-gnu-emacs@HIDDEN:bug#79759; Package emacs.
Full text available.Received: (at 79759) by debbugs.gnu.org; 3 Nov 2025 15:30:43 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Nov 03 10:30:43 2025 Received: from localhost ([127.0.0.1]:41334 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1vFwW2-00033l-KD for submit <at> debbugs.gnu.org; Mon, 03 Nov 2025 10:30:43 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:57646) by debbugs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1vFwVx-000338-HE for 79759 <at> debbugs.gnu.org; Mon, 03 Nov 2025 10:30:38 -0500 Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1vFwVd-00083x-FN; Mon, 03 Nov 2025 10:30:30 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=MIME-version:References:Subject:In-Reply-To:To:From: Date; bh=CohjOZsbxZUENZ+Ld7qnkcJsc7ggj4S8IXxZiyDFhCI=; b=Dws2vI5gT8BE8cPnlZ5d XBod6Mr3Q/osBwGKxeJdfV8DoM49/nE8W3D/85BeYoged8plIIuQ0nFk8PEfSLOuYa9HfmEGZh8mt kwDXFTM0pGw9evXjchosJbLtxHll/xqL9HT6daDQvcj7KKM/jc6llBUpjZrO1erKRFCJSpfP2SbQm ZPdNUeh7BjUd8ywIJvHOkNK9y1z3Jib4ajlHKRVS/kIP//iO3DbZQ176Eu/bRcYwaIKaB+ctl0lw2 da9hKTlW6O2eUD8xlXfdhAR7nuzF5P/udcTxeRB602V2eWGKGlL8pAJdOGZl8eukPAzlKVfDtTd6P RC0LGA6dyXEAGg==; Date: Mon, 03 Nov 2025 17:30:10 +0200 Message-Id: <868qgngmm5.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Andreas Schwab <schwab@HIDDEN> In-Reply-To: <mvmbjljjgq8.fsf@HIDDEN> (message from Andreas Schwab on Mon, 03 Nov 2025 16:09:03 +0100) Subject: Re: bug#79759: 30.2; unexpected result for integer division in Calc References: <87y0ons677.fsf@HIDDEN> <mvmseevjpby.fsf@HIDDEN> <87tszbs1g2.fsf@HIDDEN> <mvmjz07jkhj.fsf@HIDDEN> <87pl9zrzpx.fsf@HIDDEN> <mvmfravjjcp.fsf@HIDDEN> <877bw7b2iu.fsf@HIDDEN> <mvmbjljjgq8.fsf@HIDDEN> MIME-version: 1.0 Content-type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 79759 Cc: rpluim@HIDDEN, 79759 <at> debbugs.gnu.org, nicolas@HIDDEN X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) > Cc: 79759 <at> debbugs.gnu.org, Nicolas Martyanoff <nicolas@HIDDEN> > From: Andreas Schwab <schwab@HIDDEN> > Date: Mon, 03 Nov 2025 16:09:03 +0100 > > On Nov 03 2025, Robert Pluim wrote: > > > Iʼm sure youʼre right. Could you point us at this documentation? > > In the calc manual, of course. I couldn't find it, FWIW. I looked under the description of '/' and where integers are described.
bug-gnu-emacs@HIDDEN:bug#79759; Package emacs.
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charset=utf-8 Content-Transfer-Encoding: 8bit X-Spam-Level: X-Spamd-Result: default: False [-4.20 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-0.983]; MIME_GOOD(-0.10)[text/plain]; RCVD_NO_TLS_LAST(0.10)[]; RCVD_COUNT_ONE(0.00)[1]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; TO_DN_SOME(0.00)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; FUZZY_RATELIMITED(0.00)[rspamd.com]; FREEMAIL_TO(0.00)[gmail.com]; MID_RHS_MATCH_FROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; FROM_EQ_ENVFROM(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email,suse.de:mid] X-Spam-Flag: NO X-Spam-Score: -4.20 X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 79759 Cc: 79759 <at> debbugs.gnu.org, Nicolas Martyanoff <nicolas@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) On Nov 03 2025, Robert Pluim wrote: > Iʼm sure youʼre right. Could you point us at this documentation? In the calc manual, of course. -- Andreas Schwab, SUSE Labs, schwab@HIDDEN GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different."
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From: Robert Pluim <rpluim@HIDDEN>
To: Andreas Schwab <schwab@HIDDEN>
Subject: Re: bug#79759: 30.2; unexpected result for integer division in Calc
In-Reply-To: <mvmfravjjcp.fsf@HIDDEN>
References: <87y0ons677.fsf@HIDDEN> <mvmseevjpby.fsf@HIDDEN>
<87tszbs1g2.fsf@HIDDEN> <mvmjz07jkhj.fsf@HIDDEN>
<87pl9zrzpx.fsf@HIDDEN> <mvmfravjjcp.fsf@HIDDEN>
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>>>>> On Mon, 03 Nov 2025 15:12:22 +0100, Andreas Schwab <schwab@HIDDEN> s=
aid:
Andreas> On Nov 03 2025, Nicolas Martyanoff wrote:
>> Andreas Schwab <schwab@HIDDEN> writes:
>>=20
>>> On Nov 03 2025, Nicolas Martyanoff wrote:
>>>=20
>>>> I am talking about *integer* division (hence "\" and not "/").
>>>=20
>>> That only works for non-negative integers.
>>=20
>> Then Calc should signal an error.
Andreas> No, it works as documented.
I=CA=BCm sure you=CA=BCre right. Could you point us at this documentation?
Robert
--=20
bug-gnu-emacs@HIDDEN:bug#79759; Package emacs.
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a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1762179142; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=WNyas7b3vytc9+gHJLUizbNhccK/082abgBe2/D7wSI=; b=6otaqDJAD02yBRtfXN2XB57rjqJK3SRqrFkXeI9zmj90+6tWxVPy3D7+q5XtwkroYD/MPQ nROIhOuTf+g+lsAQ== Received: by hawking.nue2.suse.org (Postfix, from userid 17005) id D61D84A05B3; Mon, 3 Nov 2025 15:12:22 +0100 (CET) From: Andreas Schwab <schwab@HIDDEN> To: Nicolas Martyanoff <nicolas@HIDDEN> Subject: Re: bug#79759: 30.2; unexpected result for integer division in Calc In-Reply-To: <87pl9zrzpx.fsf@HIDDEN> (Nicolas Martyanoff's message of "Mon, 03 Nov 2025 14:51:38 +0100") References: <87y0ons677.fsf@HIDDEN> <mvmseevjpby.fsf@HIDDEN> <87tszbs1g2.fsf@HIDDEN> <mvmjz07jkhj.fsf@HIDDEN> <87pl9zrzpx.fsf@HIDDEN> Date: Mon, 03 Nov 2025 15:12:22 +0100 Message-ID: <mvmfravjjcp.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Level: X-Spamd-Result: default: False [-4.20 / 50.00]; BAYES_HAM(-3.00)[99.99%]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-0.999]; RCVD_NO_TLS_LAST(0.10)[]; MIME_GOOD(-0.10)[text/plain]; RCVD_COUNT_ONE(0.00)[1]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; RCPT_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email,suse.de:mid] X-Spam-Flag: NO X-Spam-Score: -4.20 X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 79759 Cc: 79759 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) On Nov 03 2025, Nicolas Martyanoff wrote: > Andreas Schwab <schwab@HIDDEN> writes: > >> On Nov 03 2025, Nicolas Martyanoff wrote: >> >>> I am talking about *integer* division (hence "\" and not "/"). >> >> That only works for non-negative integers. > > Then Calc should signal an error. No, it works as documented. -- Andreas Schwab, SUSE Labs, schwab@HIDDEN GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different."
bug-gnu-emacs@HIDDEN:bug#79759; Package emacs.
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[2a01:cb04:ec9:e600:9786:c4c:71a3:90d6]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429c1142e7dsm20660235f8f.17.2025.11.03.05.51.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Nov 2025 05:51:38 -0800 (PST) From: Nicolas Martyanoff <nicolas@HIDDEN> To: Andreas Schwab <schwab@HIDDEN> Subject: Re: bug#79759: 30.2; unexpected result for integer division in Calc In-Reply-To: <mvmjz07jkhj.fsf@HIDDEN> (Andreas Schwab's message of "Mon, 03 Nov 2025 14:47:52 +0100") References: <87y0ons677.fsf@HIDDEN> <mvmseevjpby.fsf@HIDDEN> <87tszbs1g2.fsf@HIDDEN> <mvmjz07jkhj.fsf@HIDDEN> Date: Mon, 03 Nov 2025 14:51:38 +0100 Message-ID: <87pl9zrzpx.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 79759 Cc: 79759 <at> debbugs.gnu.org, Nicolas Martyanoff <nicolas@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Andreas Schwab <schwab@HIDDEN> writes: > On Nov 03 2025, Nicolas Martyanoff wrote: > >> I am talking about *integer* division (hence "\" and not "/"). > > That only works for non-negative integers. Then Calc should signal an error. But I do not see why it should not work with negative numbers, and the documentation does not seem to state it. -- Nicolas Martyanoff https://n16f.net nicolas@HIDDEN
bug-gnu-emacs@HIDDEN:bug#79759; Package emacs.
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That only works for non-negative integers. -- Andreas Schwab, SUSE Labs, schwab@HIDDEN GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE 1748 E4D4 88E3 0EEA B9D7 "And now for something completely different."
bug-gnu-emacs@HIDDEN:bug#79759; Package emacs.
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From: Robert Pluim <rpluim@HIDDEN>
To: Andreas Schwab <schwab@HIDDEN>
Subject: Re: bug#79759: 30.2; unexpected result for integer division in Calc
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References: <87y0ons677.fsf@HIDDEN> <mvmseevjpby.fsf@HIDDEN>
Date: Mon, 03 Nov 2025 14:45:50 +0100
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>>>>> On Mon, 03 Nov 2025 13:03:13 +0100, Andreas Schwab <schwab@HIDDEN> s=
aid:
Andreas> Calc by default uses a precsion of 12 digits.
For integer calculation? That=CA=BCs not what its info file claims.
Robert
--=20
bug-gnu-emacs@HIDDEN:bug#79759; Package emacs.
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[2a01:cb04:ec9:e600:9786:c4c:71a3:90d6]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4772fd38c4esm85965155e9.12.2025.11.03.05.14.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Nov 2025 05:14:21 -0800 (PST) From: Nicolas Martyanoff <nicolas@HIDDEN> To: Andreas Schwab <schwab@HIDDEN> Subject: Re: bug#79759: 30.2; unexpected result for integer division in Calc In-Reply-To: <mvmseevjpby.fsf@HIDDEN> (Andreas Schwab's message of "Mon, 03 Nov 2025 13:03:13 +0100") References: <87y0ons677.fsf@HIDDEN> <mvmseevjpby.fsf@HIDDEN> Date: Mon, 03 Nov 2025 14:14:21 +0100 Message-ID: <87tszbs1g2.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 79759 Cc: 79759 <at> debbugs.gnu.org, Nicolas Martyanoff <nicolas@HIDDEN> X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Andreas Schwab <schwab@HIDDEN> writes: > Calc by default uses a precsion of 12 digits. I am talking about *integer* division (hence "\" and not "/"). Emacs Calc uses arbitrary precision integers, not floating point numbers. -- Nicolas Martyanoff https://n16f.net nicolas@HIDDEN
bug-gnu-emacs@HIDDEN:bug#79759; Package emacs.
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bug-gnu-emacs@HIDDEN:bug#79759; Package emacs.
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[2a01:cb04:ec9:e600:9786:c4c:71a3:90d6]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429c10ff20esm19908485f8f.1.2025.11.03.03.31.40 for <bug-gnu-emacs@HIDDEN> (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Nov 2025 03:31:41 -0800 (PST) From: Nicolas Martyanoff <nicolas@HIDDEN> To: bug-gnu-emacs@HIDDEN Subject: 30.2; unexpected result for integer division in Calc Date: Mon, 03 Nov 2025 12:31:40 +0100 Message-ID: <87y0ons677.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain Received-SPF: pass client-ip=2a00:1450:4864:20::42e; envelope-from=nicolas@HIDDEN; helo=mail-wr1-x42e.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, SPF_HELO_NONE=0.001, T_SPF_TEMPERROR=0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: 1.0 (+) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -0.0 (/) In Bc: -999999999999999999999999999999 / 1000000000000000 -999999999999999 -999999999999999999999999999999 % 1000000000000000 -999999999999999 So far so good. Results are consistent with my own bigint implementation. In Calc: -999999999999999999999999999999 1000000000000000 \ -1000000000000000 -999999999999999999999999999999 1000000000000000 % 1 I'm inclined to believe that Calc is either incorrect or has a very different meaning for "integer division". -- Nicolas Martyanoff https://n16f.net nicolas@HIDDEN
Nicolas Martyanoff <nicolas@HIDDEN>:bug-gnu-emacs@HIDDEN.
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