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devel / comp.lang.tcl / math error in addition

SubjectAuthor
* math error in additionYahalom Emet
+- Re: math error in additionHarald Oehlmann
+* Re: math error in additionRalf Fassel
|`- Re: math error in additionYahalom Emet
`- Re: math error in additionManuel Collado

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math error in addition

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Subject: math error in addition
From: yahal...@gmail.com (Yahalom Emet)
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 by: Yahalom Emet - Thu, 18 Jan 2024 06:39 UTC

What is wrong with the Tcl addition:
% clock format 1698526800
Sun Oct 29 00:00:00 IDT 2023
% expr 1698526800+86400
1698613200
% clock format 1698613200
Sun Oct 29 23:00:00 IST 2023

The addition should be 1698699600

Am I missing something?

Re: math error in addition

<uoanbs$2gthh$1@dont-email.me>

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From: wortka...@yahoo.com (Harald Oehlmann)
Newsgroups: comp.lang.tcl
Subject: Re: math error in addition
Date: Thu, 18 Jan 2024 09:26:37 +0100
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 by: Harald Oehlmann - Thu, 18 Jan 2024 08:26 UTC

Am 18.01.2024 um 07:39 schrieb Yahalom Emet:
> What is wrong with the Tcl addition:
> % clock format 1698526800
> Sun Oct 29 00:00:00 IDT 2023
> % expr 1698526800+86400
> 1698613200
> % clock format 1698613200
> Sun Oct 29 23:00:00 IST 2023
>
> The addition should be 1698699600
>
> Am I missing something?

Quickly looking at your example:

expr 1698526800+86400

1698526800
+ 86400
= 1698526800
+ 400
+ 6000
+ 80000
= 1698527200
+ 6000
+ 80000
= 1698533200
+ 80000
= 1698623200
----------

I come to the same result as expr. Am I missing something?
About clock, it is always good to also specify the time.

Take care,
Harald

Re: math error in addition

<ygajzo6oqv7.fsf@panther.akutech-local.de>

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From: ralf...@gmx.de (Ralf Fassel)
Newsgroups: comp.lang.tcl
Subject: Re: math error in addition
Date: Thu, 18 Jan 2024 11:52:44 +0100
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 by: Ralf Fassel - Thu, 18 Jan 2024 10:52 UTC

* Yahalom Emet <yahalome@gmail.com>
| What is wrong with the Tcl addition:
| % clock format 1698526800
| Sun Oct 29 00:00:00 IDT 2023
| % expr 1698526800+86400
| 1698613200
| % clock format 1698613200
| Sun Oct 29 23:00:00 IST 2023
>
| The addition should be 1698699600
>
| Am I missing something?

To explain why you expect the addition to give a clearly wrong result?
....800 + ...400 can't result in ...600, it needs to result in ...200.

Did you miss the transition from DST no non-DST indicated by the time
zones?

R'

Re: math error in addition

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From: mcollado...@gmail.com (Manuel Collado)
Newsgroups: comp.lang.tcl
Subject: Re: math error in addition
Date: Thu, 18 Jan 2024 12:06:58 +0100
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 by: Manuel Collado - Thu, 18 Jan 2024 11:06 UTC

El 18/1/24 a las 7:39, Yahalom Emet escribió:
> What is wrong with the Tcl addition:
> % clock format 1698526800
> Sun Oct 29 00:00:00 IDT 2023
> % expr 1698526800+86400
> 1698613200
> % clock format 1698613200
> Sun Oct 29 23:00:00 IST 2023
>
> The addition should be 1698699600

Nope. It should be 1698613200

>
> Am I missing something?

Ability to manually do numeric addition ? :-)

Re: math error in addition

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Subject: Re: math error in addition
From: yahal...@gmail.com (Yahalom Emet)
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 by: Yahalom Emet - Thu, 18 Jan 2024 13:32 UTC

On Thursday 18 January 2024 at 11:52:49 UTC+1, Ralf Fassel wrote:
> * Yahalom Emet <yaha...@gmail.com>
> | What is wrong with the Tcl addition:
> | % clock format 1698526800
> | Sun Oct 29 00:00:00 IDT 2023
> | % expr 1698526800+86400
> | 1698613200
> | % clock format 1698613200
> | Sun Oct 29 23:00:00 IST 2023
> >
> | The addition should be 1698699600
> >
> | Am I missing something?
> To explain why you expect the addition to give a clearly wrong result?
> ...800 + ...400 can't result in ...600, it needs to result in ...200.
>
> Did you miss the transition from DST no non-DST indicated by the time
> zones?
>
> R'
Yes, I missed the IDT IST conversion, great tip and interesting thing to consider when doing simple aritmetic for a day instead of using the proper 'clock' methods.
Thanks

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