what is the difference between objects and pointers?
59  3578 
Ramkumar R K wrote: what is the difference between objects and pointers?
An object is 'a region of data storage in the execution environment, the
contents of which can represent values'. (Quoted from the standard.)
E.g. an integer, struct, malloced area, pointer, or whatever.
So 'int i;' declares an object (and names it 'i').
A pointer is an object which contains the address of another object (or
of a function). E.g. `int *p;'. If you set p = &i, you can access `i'
either through its name `i' or by following the pointer (with the `*'
operator): `*p'.
--
Hallvard
"Ramkumar R K" <ra********@ind iatimes.com> wrote in message
news:74******** *************** ***@posting.goo gle.com... what is the difference between objects and pointers?
A pointer *is* an object. The difference between objects
of pointer type and those of other types, is that pointer types
are used for storing addresses, and other types store other
types of data, e.g. 'int', 'float', a user defined type
(a class or struct), etc.
-Mike ra********@indi atimes.com (Ramkumar R K) wrote: what is the difference between objects and pointers?
A pointer is an object, an object is not necessarily a pointer.
You can have pointer values, which are values of pointer objects, but it
makes little sense to talk of an object value (as opposed to <sometype>
value or simply value).
Pointers can point at pointers, but objects cannot object to objects.
Richard
Hallvard B Furuseth <h.b.furuseth(n ospam)@usit.uio (nospam).no> wrote: A pointer is an object which contains the address of another object (or
of a function).
Or possibly of itself <g>.
Richard
Richard Bos wrote:
Hallvard B Furuseth <h.b.furuseth(n ospam)@usit.uio (nospam).no> wrote:
A pointer is an object which contains
the address of another object (or of a function).
Or possibly of itself <g>.
The result of the & operator, is a pointer, though not an object.
--
pete
pete <pf*****@mindsp ring.com> wrote: Richard Bos wrote:
Hallvard B Furuseth <h.b.furuseth(n ospam)@usit.uio (nospam).no> wrote:
A pointer is an object which contains
the address of another object (or of a function).
Or possibly of itself <g>.
The result of the & operator, is a pointer, though not an object.
My hovercraft, OTOH, is full of eels - which is just as relevant.
Richard
Mike Wahler wrote: "Ramkumar R K" <ra********@ind iatimes.com> wrote in message
news:74******** *************** ***@posting.goo gle.com... what is the difference between objects and pointers?
A pointer *is* an object.
Not necessarily. In this code fragment:
int i;
int *p = &i;
&i is a pointer, but not an object.
--
Richard Heathfield : bi****@eton.pow ernet.co.uk
"Usenet is a strange place." - Dennis M Ritchie, 29 July 1999.
C FAQ: http://www.eskimo.com/~scs/C-faq/top.html
K&R answers, C books, etc: http://users.powernet.co.uk/eton
Richard Heathfield <in*****@addres s.co.uk.invalid > wrote: Mike Wahler wrote:
"Ramkumar R K" <ra********@ind iatimes.com> wrote in message
news:74******** *************** ***@posting.goo gle.com... what is the difference between objects and pointers?
A pointer *is* an object.
Not necessarily. In this code fragment:
int i;
int *p = &i;
&i is a pointer, but not an object.
AFAICT, &i is an expression with pointer type, evaluating to a pointer
value, but p is the only pointer.
Then again, it's a pain to search a document for the definition of
"pointer, but not pointer type or pointer value or object of pointer
type", but the C99 Standard _seems_ to use "pointer" both in contexts
where it must mean "a value of a pointer object" (conversion) and in
contexts where it must mean "an object of pointer type" (increment), so
if _they_ don't have to be consistent about it, I don't see why we
should.
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