[Haskell-beginners] Re: number formatting with locale

[Heinrich Apfelmus]

Dmitry Simonchik wrote:
> I'm trying to print out Double in russian locale (we use "," as decimal
> separator insetad of "."). I'm trying to set locale with
> System.Locale.SetLocale like
> 
> setLocale LC_ALL $ Just "ru_RU.UTF-8"
> 
> this returns Just "ru_RU.UTF-8", so it seems that function call succeeded,
> but when I call
> 
> show 20.2
> 
> it just prints 20.2 and not desired 20,2
> 
> Can anyone please help?

By design,  show  and  read  don't use the locale. Not to mention that
since Haskell is pure, it is *impossible* for the expression  show 20.2
:: String  to depend on the current locale.

I have never tried to use locales in Haskell, maybe someone else can
help. Most likely, you'll need to do foreign imports of C functions.


Regards,
apfelmus

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