Pointers and Arrays:

–Pointer Definition

–Pointer Concept

–Pointer to Pointer

–Array

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 */

Array Definition

• Data saved in a certain structure to be accessed as a group or individually. Some variables saved using the same name distinguish by their index.
• Array characteristics:

–Homogenous

All elements have similar data type

–Random Access

Each element can be reached individually, does not have to be sequential

• Syntax:

  type array_value [value_dim];

• Example :

int A[10];

• The definition consists of 4 components:

–Type specified

–Identifier (name of the array)

–Operator index ([ ])

–Dimensional value inside operator [ ]