[fpc-pascal] Empty string

[Jonas Maebe]

On 07 Mar 2008, at 15:09, Damien Gerard wrote:

> Le Mar 7, 2008 à 2:54 PM, Jonas Maebe a écrit :
>
>>
>> On 03 Mar 2008, at 17:16, Damien Gerard wrote:
>>
>>> In any programs, a lot of tests on empty strings are made.
>>> The following made the work :
>>> if Length(s) <> 0 then ...
>>> or
>>> if s <> '' then ...
>>>
>>> In a lot of cases, the real length is no needed, just to know if  
>>> the string is empty or not.
>>
>> That is what "if s <> '' then" checks for. This is already  
>> generated as optimally as possible.
>
> In a previous thread, I have ask the difference between (Length(s) =  
> 0) and (s = '')
>
> Copy paste a answer :
>
>>>
>>> if s = '' then ...
>>> of this one
>>> if Length(s) <> 0 then ...
>>
>> Both generate the same code.
>
> Consequently, it can not be the same code. Otherwise I understood  
> nothing :)

I don't understand your question. Above, you say that these statements  
work:

>>> if Length(s) <> 0 then ...
>>> or
>>> if s <> '' then ...

(or does "made the work" mean something else?). If that indeed works,  
then everything is fine, because
a) both indeed generate the same code
b) both check whether the string is empty or not (without actually  
looking at the length)


Jonas