[erlang-questions] why do I see a message about area of a square

[Hynek Vychodil]

Hi,

You don't have any functions named square, circle or triangle. You have
only one function array/1 with four function clauses, the first for square,
the second for circle, the third for triangle and the fourth catch-all one.

Hynek

On Sun, Jan 25, 2015 at 12:29 PM, Roelof Wobben <r.wobben@REDACTED> wrote:

> Thanks,
>
> That error messages disappear.
>
> As I understand it right. The eror message is on all functions so on the
> square, circle and triangle functions.
> And if not so, why also not a error functions on the other two.
>
> Roelof
>
>
>
>
> Taavi Talvik schreef op 25-1-2015 om 12:22:
>
>  Until you export your functions, they remain local to
>> module. And compiler sees here, that they are not used
>> locally here.
>>
>> Try adding
>> -export([area/1]).
>>
>> best regards,
>> taavi
>> On 25 Jan 2015, at 13:12, Roelof Wobben <r.wobben@REDACTED> wrote:
>>
>>  Hello,
>>>
>>> I have this programm  :
>>>
>>> -module(shapes).
>>>
>>> -import(math, [sqrt/1]).
>>>
>>> area({square, Side}) ->
>>>    Side * Side ;
>>>
>>> area({circle, Radius}) ->
>>>    math:pi() * Radius * Radius;
>>>
>>> area({triangle, A, B, C}) ->
>>>    S = (A + B + C)/2,
>>>    math:sqrt(S*(S-A)*(S-B)*(S-C));
>>>
>>> area(Other) ->
>>>    {error, invalid_object}.
>>>
>>>
>>> As soon I as try to compile it , I see these messages :
>>>
>>>
>>> 6> c(shapes).
>>> shapes.erl:5: Warning: function area/1 is unused
>>> shapes.erl:15: Warning: variable 'Other' is unused
>>>
>>> Why does Erlang do this?
>>> On compile time you cannot see which functions are used and which not in
>>> my oponion.
>>>
>>> Roelof
>>>
>>>
>>> _______________________________________________
>>> erlang-questions mailing list
>>> erlang-questions@REDACTED
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>>>
>>
>>
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