Essential Books

Pointer to Pointer

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In C, a pointer can refer to another pointer. 

#include <stdio.h>
#include <stdlib.h>

int main(void) {
  int A = 42;
  int* pA = &A;
  int** ppA = &pA;
  int*** pppA = &ppA;

  printf("%d", ***pppA); /* prints 42 */

  return EXIT_SUCCESS;
}

But, reference-and-reference directly is not allowed. 

#include <stdio.h>
#include <stdlib.h>

int main(void) {
  int A = 42;
  int* pA = &A;
  int** ppA = &&A; /* Compilation error here! */
  int*** pppA = &&&A;  /* Compilation error here! */
...
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Pointers:
* Pointers
* Allocating Memory
* Introduction
* Freeing Memory
* Common errors
* Reallocating Memory
* Dereferencing a Pointer
* Dereferencing a Pointer to a struct
* Const Pointers
* Function pointers
* Polymorphic behaviour with void pointers
* Initializing Pointers
* Address-of Operator
* void pointers as arguments and return values to standard functions
* Pointer Arithmetic
* Same Asterisk Different Meanings
* Pointer to Pointer
Table Of Contents