Arrays

Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index.

Index starts from 0 to size-1.

Arrays can be one-dimensional or multi-dimensional in C# language. The more popular and frequently used arrays are one-dimensional and two-dimensional arrays.

Arrays store the collection of data sequentially in memory and they must share same data type.

How to declare an array?

data-type[] array-name; //declaration
array-name = new data-type[size]{ array-elements }; //initialization

[or]

data-type[] array-name =  new data-type[size]{ array-elements }; //declaration and initialization

[or]

data-type[] array-name =  { array-elements }; //short syntax of array declaration and initialization

Examples

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

How to access array elements

Array elements can be accessed by using indices. Array indices starts from 0. Array[n-1] can be used to access nth element of an array.

Example

using System;

namespace Arrays
{
	public class Arrays
	{
		public static void Main(string[] args)
		{
		    int[] arr = {1,2,3,4,5};
        int n = arr.Length; // gives length of an array
        Console.WriteLine("Length of the array: {0}" , n );
        Console.WriteLine("first element: {0}" , arr[0] ); // prints first element of the array
        Console.WriteLine( "last element: {0}" , arr[n-1]); // prints last element of the array
    }
	}
}

Check result here

Summary

• Arrays is a collection of homogeneous data.
• Arrays stores data sequentially in memory.
• Arrays are finite.