Array can be easily defined as a variable that hold multiple elements which has the same data type. C uses arrays as a way of describing a collection of variables with identical properties.

type variable_name[lengthofarray];

Simple Program showing an array of 5 elements.

In this case we have ages[5] as an array. i.e ages[0],ages[1],ages[2],ages[3],ages[4].

Example of Array Declaration:

double arr[100]

Another example :

int myArray[5] = {1, 2, 3, 4, 5}; //declaring and initialize the array in one statement
int number[4];
number[0]=14;
number[1]=13;
number[2]=15;
number[3]=16;

Declaration of a 2D array in C language:

int x[3][2] - matrix 3X2 (3 rows, 2 columns(

Example:

int array[3][3] = {1, 2, 3, 4, 5};
array[0][0] = 1
array[0][1] = 2
array[0][2] = 3
array[1][0] = 4
array[1][1] = 5
array[1][2] = 0
array[2][0] = 0
array[2][1] = 0
array[2][2] = 0

 
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See this program of Matrix Multiplication using the concept of Arrays.

Matrix Multiplication

Multiplying Matrices with Each Other.

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