[erlang-questions] string:to_float/1 behavior

Serge Aleynikov <>
Wed Jan 12 18:20:06 CET 2011

It is a BIF.  Look here:


It does handle both "." and "," cases - this is hardcoded in the 

On 1/12/2011 10:11 AM, Alexey Romanov wrote:
> 1) Where can I find its source? It isn't defined in
> lib/stdlib-1.17.1/src/string.erl. I thought it must be a BIF, but "ack
> to_float /usr/local/lib/erlang/" doesn't seem to find anything
> relevant. The full output is at https://gist.github.com/776256, but 1)
> the only C function found is in
> lib/erl_interface-3.7.1/src/legacy/erl_marshal.c; 2) the Erlang code
> doesn't seem to define any mapping for this name.
> 2) The reason I went looking for its code is to check whether it is
> guaranteed to deal with both "." and "," as decimal separators,
> independent of locale? It does on my machine (with
> LC_NUMERIC="en_US.UTF-8") but the string module documentation doesn't
> say anything.
> Yours, Alexey Romanov
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