static promenne v codevisionu

[admin.mtech]

Prosim Vas, a co nie je pravda? Nejako sa v tom prispevku neviem 
dopatrat rozdielu voci tomu co som pisal....
Ako som pisal:
Direktiva (ano, spravne je direktiva) "static" vravi kompileru, ze 
premenna pouziva staticku pamat. Pod cim ja rozumiem, ze ma pevne 
pridelenu adresu v pamati.
Druhe moje tvrdenie "Teoreticky by sa mala nastavit na 0", Vasa citacia 
iba potvrdzuje.
A tym, ze pred premennu vrazim IAR-ovske "_no_init_" poviem kompileru 
aby tuto premennu neinicializoval (nulovat) po resete.
Neviem ako sa "_no_init_" pise v codevision, ale cez cstartup.asm sa to 
da ovplyvnit (okrem ineho)...

Co som poplietol?

-mt-


Miroslav Šinko  wrote / napísal(a):
> To nie je pravda, dokonca norma ANSI C hovori o hodnotach
> neinicializovanych premennych:
>
> 10 If an object that has automatic storage duration is not initialized
> explicitly, its value is
> indeterminate. If an object that has static storage duration is not
> initialized explicitly,
> then:
> — if it has pointer type, it is initialized to a null pointer;
> — if it has arithmetic type, it is initialized to (positive or unsigned) zero;
> — if it is an aggregate, every member is initialized (recursively)
> according to these rules;
> — if it is a union, the first named member is initialized
> (recursively) according to these
> rules.
>
> miro
>
> 2009/3/5 admin.mtech <admin.mtech@gmail.com>:
>   
>> pokial viem klucove slovo "static" vravi, ze nasledne deklarovana
>> premenna bude mat priradene pamatove miesto aj po vyskoceni z funkcie.
>> Cize sa z nej vlastne stane globalna premenna.
>> To ale nenamena, ze po starte programu bude mat premenna definovanu hodnotu.
>> Teoreticky by sa mala nastavit na 0. Prakticky ale treba vediet co s
>> nou  (s jej pamatovym miestom) urobi cstartup.asm
>> Pokial sa pouzije (u IAR-a) klucove slovo _no_init_, tak sa nebude
>> nulovat po resete.
>>
>> Co vlastne od tej (tych) premennej potrebujete?
>>
>> -mt-
>>
>>     
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