Re: REQUEST - bash floating point math support

[Léa Gris]

Le 05/06/2024 à 17:09, Koichi Murase écrivait :
> 2024年6月5日(水) 21:41 Zachary Santer <zsanter@gmail.com>:
> > Bash could potentially detect floating point literals within
> > arithmetic expansions and adjust the operations to use floating point
> > math in that case. [...]
>
> ksh and zsh are already behaving in that way, and if Bash would
> support the floating-point arithmetic, Bash should follow their
> behavior.

Bash isn't even consistent with the floating point data/input format 
when using printf '%f\n' "$float_string" as it depends on LC_NUMERIC locale.

LC_MESSAGES=C LC_NUMERIC=fr_FR.UTF8 printf '%f\n' 3.1415
bash: printf: 3.1415: invalid number
3,000000


Chet explained it is because Bash is following the POSIX norm and C 
printf rules.

Now imagine if Bash introduce floating-point support, you write a Bash 
script with decimal point floating-point numbers and your script is 
incompatible with systems whose locale use a decimal comma instead.


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