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Re: Arithmetic Zero

X-seq: zsh-users 29716
From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
To: sergio <sergio@xxxxxxxxxxxxx>
Cc: zsh-users@xxxxxxx
Subject: Re: Arithmetic Zero
Date: Mon, 4 Mar 2024 20:23:51 -0800
Archived-at: <https://zsh.org/users/29716>
In-reply-to: <47117922-e17f-44d1-8a2f-2cb4a9c53606@outerface.net>
List-id: <zsh-users.zsh.org>
References: <47117922-e17f-44d1-8a2f-2cb4a9c53606@outerface.net>

On Mon, Mar 4, 2024 at 7:28 PM sergio <sergio@xxxxxxxxxxxxx> wrote:
>
> I believe -e is best practices for scripts

Leaving opinions aside ...

> 1. What is the reason for returning 1 when an arithmetic evaluation
> succeeds but is zero?

(( ... )) is intended to be useful in tests:
  if (( status == 1 )); then ...

> 2. How to do arithmetic evaluation properly in zsh sripts?

Several choices.
  typeset -i test=0
  : $(( test = 0 ))
  printf -v x "%d" 0

Or (back to opinions) don't use errexit.  IMO it's a band-aid that
discourages properly testing exit status where you should.  Plus, it's
got several obscure bugs in all released versions of zsh, not fixed
until the current development version (as of late 2022).

Follow-Ups:
- Re: Arithmetic Zero
  - From: Stephane Chazelas
- Re: Arithmetic Zero
  - From: Lawrence Velázquez

References:
- Arithmetic Zero
  - From: sergio

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