need help with pointers in C

hi all,
well this is my first time here, and i have a pretty simple question i think . :) .
i have this project to do, in which i have to implement a linked list using pointers. well i have a int*head pointing to the head of list and
int ** p;
p = &head;
while(**p!=NULL) // is this right for going thru the list or something wrong here??


thanks a lot.
i would really appreciate any kind of help from anyone.
fatima

Okay I would have to see just a little more code to know where your program is breaking. However, I can start off by explaining linked list.

Code:

---

struct LinkedList{
    int vaule;
    struct LinkedList *p;
};

---

Notice that the p member points to another struct LinkedList. You may want to do a search for a more thorough explanation of stacks, queues, and other memory organization techniques that a linked list can be used for creating.

>while(**p!=NULL) // is this right for going thru the list or something wrong here??
p is a pointer to a pointer, dereferencing it once will give you the pointer it points to and dereferencing it twice will return the contents of the memory. So if p is a pointer to a node the loop should be:

Code:

---

p = head;
while ( p != NULL )
  p = p->next;

---

And if p is a pointer to a pointer to a node it should be:

Code:

---

p = &head;
while ( *p != NULL )
  *p = (*p)->next;

---

-Prelude