[erlang-questions] casting float to integer

[Per Hedeland]

Håkan Stenholm <hokan.stenholm@REDACTED> wrote:
>
>Nitin Verma wrote:
>> Hi All,
>>
>> I am looking for a function/BIF that can help me.
>>
>> Problem: I need a float number's floored integer. That is if:
>> A = f(5/2), then A = 2 and
>> A = f(1000/501), then A = 1
>>
>> I found 'round/1' but it just rounds-off .

>see erlang.erl documentation:
>
>-----------------------------------------------------------------------
>
>*|trunc(Number) -> int()|*

But trunc is not the same as floor - though maybe Nitin actually wants
trunc, or even div (which "truncates" the same way as trunc), as
indicated by the examples. When I actually needed floor/1, I came up
with this somewhat bizarre-looking definition:

floor(V) when V >= 0 -> trunc(V);
floor(V) -> trunc(V - trunc(V) + 1) + trunc(V) - 1.

There may be a better way to do it...

--Per Hedeland