bug#40892: 26.3; emacs calculator.el: return values are truncated integers

bug#40892: 26.3; emacs calculator.el: return values are truncated integers

[Aitor Soroa]

The calculator.el: wrongly returns integers. For instance:

emacs -Q
M-x calculator
22 / 7

The answer is '3'. Even worse, If I set calculator-remove-zeros to nil, 
then I get '3.000'


In GNU Emacs 26.3 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
of 2019-09-16 built on lcy01-amd64-030
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Ubuntu 18.04.4 LTS

Recent messages:
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Loading package projectile...done (0.190s)
Loading package ccls...
Configuring package cc-mode...done
Loading package ccls...done (0.388s)
For information about GNU Emacs and the GNU system, type C-h C-a.
Emacs ready in 2.22 seconds with 16 garbage collections.

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bug#40892: 26.3; emacs calculator.el: return values are truncated integers

[Andreas Schwab]

On Apr 27 2020, Aitor Soroa wrote:

> The calculator.el: wrongly returns integers. For instance:
>
> emacs -Q
> M-x calculator
> 22 / 7
>
> The answer is '3'. Even worse, If I set calculator-remove-zeros to nil,
> then I get '3.000'

This is consistent with how Emacs Lisp works:

ELISP> (/ 22 7)
3 (#o3, #x3, ?\C-c)
ELISP> (/ 22 7.0)
3.142857142857143

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

bug#40892: 26.3; emacs calculator.el: return values are truncated integers

[Tomas Nordin]

Andreas Schwab <schwab@linux-m68k.org> writes:

> On Apr 27 2020, Aitor Soroa wrote:
>
>> The calculator.el: wrongly returns integers. For instance:
>>
>> emacs -Q
>> M-x calculator
>> 22 / 7
>>
>> The answer is '3'. Even worse, If I set calculator-remove-zeros to nil,
>> then I get '3.000'
>
> This is consistent with how Emacs Lisp works:
>
> ELISP> (/ 22 7)
> 3 (#o3, #x3, ?\C-c)
> ELISP> (/ 22 7.0)
> 3.142857142857143

It might be a bit surprising through an interface that is meant to be
similar to popular calc apps (if meant so). On the other hand maybe one
wants to do integer divisions as well. This report could be a suggestion
of a new variable like 'treat-input-integers-as-floats'.

bug#40892: 26.3; emacs calculator.el: return values are truncated integers

[Noam Postavsky]

>>> M-x calculator
>>> 22 / 7
>>>
>>> The answer is '3'.

>> ELISP> (/ 22 7)
>> 3 (#o3, #x3, ?\C-c)
>> ELISP> (/ 22 7.0)
>> 3.142857142857143
>
> It might be a bit surprising through an interface that is meant to be
> similar to popular calc apps (if meant so). On the other hand maybe one
> wants to do integer divisions as well. This report could be a suggestion
> of a new variable like 'treat-input-integers-as-floats'.

There is already an integer division operation:

    22.0 / 7 RET ===> 3.143

    22.0 \ 7 RET ===> 3

But we probably do still want an option, just because existing users may
want to keep the current behaviour.

bug#40892: 26.3; emacs calculator.el: return values are truncated integers

[Mattias Engdegård]

> But we probably do still want an option, just because existing users may want to keep the current behaviour. 

No we don't. It's a clear bug; let's just fix it.

In fact, it's a regression; in 22.1, at least, it works correctly. Looks like it was f248292ede.

bug#40892: 26.3; emacs calculator.el: return values are truncated integers

[Noam Postavsky]

found 40892 26.1
tags 40892 + confirmed
quit

Mattias Engdegård <mattiase@acm.org> writes:

>> But we probably do still want an option, just because existing users may want to keep the current behaviour. 
>
> No we don't. It's a clear bug; let's just fix it.
>
> In fact, it's a regression; in 22.1, at least, it works correctly. Looks like it was f248292ede.

Ah, you're right.  It works as expected in 25.3 as well.

bug#40892: 26.3; emacs calculator.el: return values are truncated integers

[Mattias Engdegård]

The simplest possible solution is to convert input numbers to float, which used to be how it worked. Done on emacs-27.

Thanks for the report!

bug#40892: 26.3; emacs calculator.el: return values are truncated integers

[Eli Zaretskii]

> From: Mattias Engdegård <mattiase@acm.org>
> Date: Thu, 30 Apr 2020 15:15:13 +0200
> Cc: Andreas Schwab <schwab@suse.de>, Eli Barzilay <eli@barzilay.org>,
>  Aitor Soroa <a.soroa@ehu.eus>, Tomas Nordin <tomasn@posteo.net>,
>  Noam Postavsky <npostavs@gmail.com>
> 
> The simplest possible solution is to convert input numbers to float, which used to be how it worked. Done on emacs-27.

I've reverted it, sorry.  Please don't put on emacs-27 anything that
doesn't have to be there.

This fix should go to master.

bug#40892: 26.3; emacs calculator.el: return values are truncated integers

[Eli Barzilay]

Thanks for finally fixing it!  I've noticed this bug a long time ago,
and didn't get to fixing it, thinking that some would argue for a flag
instead of just going back to the original behavior...

On Thu, Apr 30, 2020 at 9:15 AM Mattias Engdegård <mattiase@acm.org> wrote:
>
> The simplest possible solution is to convert input numbers to float, which used to be how it worked. Done on emacs-27.
>
> Thanks for the report!
>


-- 
                   ((x=>x(x))(x=>x(x)))                  Eli Barzilay:
                   http://barzilay.org/                  Maze is Life!