Array in C

Language

Index

Introducing Arrays.

Declaration of a Array. Variables, Creating Arrays.

The Length of Arrays.

Initializing Arrays.

Multidimensional Arrays.

Introducing Arrays

Array is a static data type which store the collection of

similar type of data within a single variable. It can be single

and multi dimension. Size of array represent the total

number of element of array, data stored in array with index,

we can retrieve data by there index.

Introducing Arrays

Array is a data structure that represents a collection of the same types of data.

int num[10];

Num reference

An Array of 10 Elements of type int.

num [0]

num[1]

num[2]

num [3]

num[4]

num[5]

num[6]

num[7]

num[8]

num[9]

Introducing Arrays

Syntax :

<data_type> <array_name> [size]

eg : int arr[5];

Declaring Array Variables

Data type array name[index];

Example:

int list[10];

char num[15];

float hat[20];

Creating Arrays

Data type array-name[size];

Example:

int num[10];

num[0]references the first element in the array.

num[9]references the last element in the array.

The Length of Arrays

Once an array is created, its size is fixed. It cannot be changed.

For Example,

int arr[10];

You can not insert any number to arr[11] location because it is not initialized.

Initializing Arrays

Declaring, creating, initializing in one step:

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

int studentAge[4];

studentAge[0] = 14;

studentAge[1] = 13;

studentAge[2] = 15;

studentAge[3] = 16;

Multidimensional Arrays

int matrix[10] [10];

for (i=0; i<10; i++)

for (j=0; j<10; j++)

{

matrix[i] [j] = i * j;

}

float mat[5] [5];

Multidimensional Array Illustration

0 1 2 3 4

0

1

2

3

4

0 1 2 3 4

0

1

2 7

3

4

int matrix[5] [5]; matrix[2] [1] = 7

0 1 2

0 1 2 3

1 4 5 6

2 7 8 9

3 10 11 12

int[][] array ={{1, 2, 3},{4, 5, 6},{7, 8, 9},{10, 11, 12}};

Initializing of Multidimensional Arrays

To declare, create and initialize a multidimensional array.

For example,int[][] array = {

{1, 2, 3},{4, 5, 6},{7, 8, 9},{10, 11, 12}

};

This is equivalent to the following statements:array[0][0] = 1; array[0][1] = 2; array[0][2] = 3;array[1][0] = 4; array[1][1] = 5; array[1][2] = 6;array[2][0] = 7; array[2][1] = 8; array[2][2] = 9;array[3][0] = 10; array[3][1] = 11; array[3][2] = 12;

#include<stdio.h>

void main(){

int arr[5];int i, b;//inputprintf("How many element you want to enter\n");scanf("%d", &b);printf("Enter %d No for array\n", b);for(i=0 ;i<b ; i++){

scanf("%d", &arr[i]);}//outputprintf("\nElement of the array are :\n");for(i=0; i<b ; i++){

printf("Element of %d position is %d\n", i, arr[i]);}

}

Output