[erlang-questions] Erlang case statement questions

Keith Irwin <>
Tue Jun 2 00:11:03 CEST 2009


Also, PQ is thrown away after the end if the statement.
Maybe:

analyze(N) ->
  PQ = case (N rem 9) of
              1 -> [{1,1}, {2,5}, {4,7}, {8,8}]
              % etc, etc
           end,
  do_something_with(PQ).

On Mon, Jun 1, 2009 at 12:05 PM, Tony Rogvall <> wrote:

> Also.  9 rem 9 = 0!
> So I guess your cases should be from 0 to 8 or something similar.
>
> /Tony
>
>
> On 1 jun 2009, at 19.51, Nahuel Greco wrote:
>
>  End the last clause without the semicolon.
>>
>> Saludos,
>> Nahuel Greco.
>>
>>
>>
>> On Mon, Jun 1, 2009 at 2:48 PM, Greg Perry <>
>> wrote:
>>
>>> Ok I've put together a simple module declaration but I am getting an
>>> error on this case statement.  What am I doing wrong with this?  N is an
>>> integer that gets passed to the module, based upon the return of N rem
>>> 9, PQ then gets assigned the list of items on the right:
>>>
>>> ----------
>>>
>>> analyze(N) ->
>>>  case (N rem 9) of
>>>     1 -> PQ = [{1,1}, {2,5}, {4,7}, {8,8}];
>>>     2 -> PQ = [{1,2}, {4,5}, {7,8}];
>>>     3 -> PQ = [{1,3}, {2,6}, {3,4}, {3,7}, {5,6}, {6,8}];
>>>     4 -> PQ = [{1,4}, {2,2}, {5,8}, {7,7}];
>>>     5 -> PQ = [{1,5}, {2,7}, {4,8}];
>>>     6 -> PQ = [{1,6}, {2,3}, {3,5}, {3,8}, {4,6}, {6,7}];
>>>     7 -> PQ = [{1,7}, {2,8}, {4,4}, {5,5}];
>>>     8 -> PQ = [{1,8}, {2,4}, {5,7}];
>>>     9 -> PQ = [{1,9}, {2,9}, {3,3}, {3,6}, {3,9}, {4,9}, {5,9}, {6,6},
>>> {6,9}, {7,9}, {8,9}, {9,9}];
>>>  end.
>>>
>>> ----------
>>>
>>> I used the example in Joe's Programming Erlang book for the case
>>> statement, but got something wrong obviously.
>>>
>>> Thanks in advance,
>>>
>>> Greg
>>>
>>>
>>>
>>>
>>> ________________________________________________________________
>>> erlang-questions mailing list. See http://www.erlang.org/faq.html
>>> erlang-questions (at) erlang.org
>>>
>>>
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>
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