Hi, thanks for taking time to reply,

KatolaZ wrote:
>> c) type **ss; // declare a pointer to pointer. System only allocates
>> space for one address

> C pointers are *always* one variable, precisely a variable large
> enough to store a memory address on the current architecture.

I think, I did not understand what you want to say. As far as I can
imagine a pointer to pointer is something like this:
[pointer1]------>[pointer2]------->[data] int the case of data** dt.

OR

[pointer1]------>[pointer2] in the case of void** ptr.

Edward

On 31/03/2016, KatolaZ <katolaz@???> wrote:
> On Thu, Mar 31, 2016 at 08:38:26AM -0300, Emiliano Marini wrote:
>> +1
>>
>> Besides, * and [] are interchangeable. You can define a string as an array
>> and use it later as a pointer:
>>

>> char s[] = "hola";
>> char x = s[1];     // Here x = 'o'
>> char y = *(s+2);   // Here y = 'l'

>>
>> And vice versa:
>>

>> char *s = "hola";
>> char x = s[0];     // Here x = 'h'
>> char y = *(s+3);   // Here y = 'a'

>>
>
> Just to be pedantic here, "[]" is just syntactic sugar around the
> dereference operator "*". And in fact "[]" did not even exist in the
> first versions of proto-C. Obviously, "[]" is syntactic sugar around
> unary "*" for *any* kind of pointer, not just for strings.
>
> Also, initialisation of char* and char[] by means of
>
> char s[] = "hello";
>
> is syntactic sugar around the generic initialiser:
>
> type p = {...};
>
> which allows to initialise arrays and compound variables (structs and
> unions) as well. But be careful with statically initialised strings,
> since they are effectively constant char pointers (they are stored in
> the current stack frame, not in the heap, and the address stored in
> such variables cannot be modified, AFAIR).
>
> My2Cents
>
> KatolaZ
>
> --
> [ Enzo Nicosia aka KatolaZ --- GLUG Catania -- Freaknet Medialab ]
> [ me [at] katolaz.homeunix.net -- http://katolaz.homeunix.net -- ]
> [ GNU/Linux User:#325780/ICQ UIN: #258332181/GPG key ID 0B5F062F ]
> [ Fingerprint: 8E59 D6AA 445E FDB4 A153 3D5A 5F20 B3AE 0B5F 062F ]
> _______________________________________________
> Dng mailing list
> Dng@???
> https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
>