Arrays

What you’ll learn:

o Defining and using arrays

o Defining and using strings

What is an array ?

An array is a collection of variables of the same type that are referenced by a common

name.

They are a derived data type.

We can divide arrays into two types:

Single Dimensional (1-D) arrays

Multi Dimensional arrays

Single Dimensional Arrays

1 2 3

int arr [5] = { 1, 2, 3, 4, 5 };

Syntax: base_type array_name [size];

Size

Array name Initialization

Base Type

Memory:

4000 4016 4020

4 5

4004

Total Size:

4 X 5 = 20

Multi Dimensional Arrays

1 2 3 4 5

int arr [3][2] = { {1,2}, {3,4}, {5,6} };

Syntax: base_type array_name [rows][columns];

Size

Array name Initialization

Base Type

Memory

4000 4020 4024

6

4004

Total Size:

4 X 6 = 241 2

3 4

5 6

4008

4016

4000

Strings

‘H’ ‘e’ ‘l’ ‘l’

char str[] = “Hello”;

Syntax: char array_name [size];

Size

String name Initialization

Memory:

4000 4005 4006

‘o’ ‘\0’

4001

Total Size:

1 X 6 = 6