Re: Bus error when writing in a typed file

The following program is completely equivalent to the previous one but it executes without errors.
(Thanks Chief !)

Baudouin Le Charlier


Le 18 nov. 2012 à 16:18, Prof A Olowofoyeku (The African Chief) a écrit :

> On 18 Nov 2012 at 10:16, Baudouin Le Charlier wrote:
> 
>>  Here is a very simple example where the bus error occurs :
>> 
>> I executed the following commands :
>> 
>> Soeur-Sourire:Cours17 blc$ gp busError.pas 
>> Soeur-Sourire:Cours17 blc$ ./busError 
>> Bus error
>> Soeur-Sourire:Cours17 blc$ 
>> 
>> After executing the program, the file toto.pers exists and is empty
>> (Zero bytes).
>> 
> 
> Apart from the fact that nothing in the record is initialialised, this 
> is the offending statement:
>        case sexe : boolean of
>          true : (nomDeJeuneFille : string80) ;
>          false : (matricule : string10) 
> 
> What I am about to say may simply expose my ignorance - but I will say 
> it anyway. I am no compiler writer, and I don't use variant records 
> myself - but, from where I am standing, I am at a loss to know what the 
> size of the "personne" record is. "nomDeJeuneFille" and "matricule" are 
> supposed to occupy the same location, but they are not the same size. 
> So what data size is the "file of personne" expecting? Data that will 
> vary in size depending on a value that is not known at compile time? Is 
> this allowed?
> 
> Best regards, The Chief
> --------
> Prof. Abimbola A. Olowofoyeku (The African Chief) 
> web:  http://www.greatchief.plus.com/
>

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