[Gambas-user] static const?

[Jussi Lahtinen]

Always forgetting something... "INC a".

Jussi


On Wed, Apr 14, 2010 at 01:59, Jussi Lahtinen <jussi.lahtinen at ...626...> wrote:
> Aaa.... I think you meant it this way:
>
> PUBLIC FUNCTION ScanTab(IdCaption AS Integer) AS Integer
> Dim a as Integer
> Dim b as Integer
>
> REPEAT
>   IF TabStrip3[a].Caption = IdCaption THEN
>      b = TabStrip3.Count
>      BREAK
>   ENDIF
> WHILE a < TabStrip3.Count
>
> RETURN b
> END
>
> Jussi
>
>
> On Wed, Apr 14, 2010 at 01:55, Jussi Lahtinen <jussi.lahtinen at ...626...> wrote:
>> First you referred to FOR loop only,
>> but with case of return command you are talking more generally about loops?
>> Or so I understand as you are speaking about it's influence to code structure.
>>
>> Consider this, if you have VERY long iteration and but you are done
>> with first element of iteration.
>> Then there is no reason to continue iteration anymore, because it is
>> just waste of time.
>>
>> Let's take your example (I did clean it up):
>>
>> PUBLIC FUNCTION ScanTab(IdCaption AS Integer) AS Integer
>> Dim a as Integer
>>
>>  FOR a = 0 TO TabStrip3.Count - 1
>>     IF TabStrip3[a].Caption = IdCaption THEN
>>        RETURN TabStrip3.Count
>>     ENDIF
>>  NEXT
>>
>> RETURN 0
>> END
>>
>> Now this is not very realistic case with this example, but let's
>> pretend it is so.
>> Let's say that this iteration takes 10 second to run trough and there
>> are 10 items.
>> When first item is what is needed, then this function takes only 1
>> second to execute.
>> If we do not break that loop it will always take 10 seconds.
>>
>> Just to make sure, you meant it should be like this?
>>
>> PUBLIC FUNCTION ScanTab(IdCaption AS Integer) AS Integer
>> Dim a as Integer
>> Dim b as Integer
>>
>>  FOR a = 0 TO TabStrip3.Count - 1
>>     IF TabStrip3[a].Caption = IdCaption THEN
>>        b = TabStrip3.Count
>>     ENDIF
>>  NEXT
>>
>> RETURN b
>> END
>>
>>
>> Also you should notice, that this is normal practice in Basic languages.
>> And therefore also question of portability.
>>
>> Jussi
>>
>>
>>
>> 2010/4/14 Fabián Flores Vadell <fabianfloresvadell at ...626...>:
>>>> Why shouldn't the compiler allow to modify a loop variable? It is sometimes
>>>> useful.
>>>
>>> I'm refering to the loop FOR only. IMHO, WHILE and REPEAT are good
>>> structures that allow at programmer take absolute control over
>>> iterations, objective of FOR is iterate all items of a memory
>>> structure. At least, I think that was of the original design purpose
>>> (distorted after).
>>>
>>> In fact, the need of FOR structure is relative. Any need can be easily
>>> cover with WHILE and REPEAT.
>>>
>>> I don't see the need for break a iteration structure from inside, in
>>> any way (even break and continue). This would be done from conditional
>>> input or output of the structure. But I see the consecuences.
>>>
>>> May be, the exeption to this is FOR EACH structure.
>>>
>>>> Why shouldn't the compiler allow to return from inside a loop? It is perfectly
>>>> valid to do that.
>>>
>>> Why allow break a loop in this way? That often leads to write multiple
>>> statements  RETURN in a function. That does not comply with the
>>> theorem of structured programming (that have as one of its premises
>>> allow only a input point and unique exit). I think that in practice
>>> this difficults the tests; if necesary to port the code, this could be
>>> an aditional problem; among other things.
>>>
>>>> A bad programmer using some syntax for writing bad code does not necessary
>>>> imply that that syntax should be forbidden.
>>>
>>> I agree, but actually I was thinking that this affect more to those
>>> who approach programming in an informal way.
>>>
>>>
>>> --
>>> Fabián Flores Vadell
>>> www.speedbooksargentina.blogspot.com
>>>
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>>
>