Pointers and Array

Pointer and Arrays

Pointer Definition

Pointer is a variable that store the address of another variable

Syntax :

<type> *ptr_name;

Two operators mostly used in pointer : * (content of) and & (address of)

Example: 

Initialize an integer pointer into a data variable: 

int i, *ptr;

ptr = &i;

To assign a new value to the variable pointed by the pointer:

*ptr = 5;  /* means i=5 */ 

   Pointer Concept

   Pointer To Pointer

•Pointer to pointer is a variable that saves another address of a pointer or is a form of multiple indirection, or a chain of pointers. Normally, a pointer contains the address of a variable. When we define a pointer to a pointer, the first pointer contains the address of the second pointer, which points to the location that contains the actual value as shown below.

•Syntax:

  <type> **ptr_ptr ;

•Example:

  int i, *ptr, **ptr_ptr;

  ptr = &i;

  ptr_ptr = &ptr;

  To assign new value to i:

  *ptr = 5;  // means i=5 ;

  **ptr_ptr = 9;   // means i=9; or *ptr=9;

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