What is Array ? Type Of Array

What is Array

• When we have to access and manipulate a program by storing a lot of data of the same type, then instead of declaring many Variables to store these same types of data, we do Array Declare.

• Array is a type of Reference Type that uses the Heap Area of ​​Memory to store the same type of Data Items and uses Continues Memory Locations to store every Data Item of Array. 

• All data items are stored in memory in a fixed order and a unique Zero Based Unique Index Number is specified with each element to uniquely identify it. Also, Array is a Fixed Data Structure. So once Array's size is defined, then Array's size cannot be modified.

Declaring Array: 

• Array, like Simple Variable, is given the value of thelast index of the array in parentheses (parentheses) after the name of the array while Declare using Dim, Private or Public Statement. Which is called subscript, index or size.

Syntax: Dim <array name> (subscript) As <Data Type>

Example: Dim employee_ name (20) As String

Dim salary (20) As Integer

Types of Array

There are two types of Array in Visual Basic.

1. One Dimensional Array

2. Multi-Dimensional Array

1.One Dimensional Array:  

• Arrays that contain only one index or subscript are called one dimensional arrays. Multiple values can be stored in it. In this, its index is used to store or access a value in an array.

Example: Dim marks (10) As Integer

• The marks array can store 0 to 9 indexes or 10 values in the marks array.Initializing one dimensional Array: values can be inserted in both the design and run time in a dimensional array.

Array index or Curly brackets {} are used to store the value in design time.

Syntax :  Dim Array_name () As Data type = {element1, element2,….}

Example :  Dim name () As String = {" shaikh ", " vishnu ", " virat "}

or

Dim Name (2) As String

Name (0) = "shaikh "

Name (1) = "vishnu"

Name (2) = "virat"

2.Multi-Dimensional Array:  

• Arrays of many dimensions can be created in VB.Net. Arrays That Contain More Than One Subscripts Are Called  Multi-Dimensional Arrays. 

• Dim, Private Or Public Statements Are Also Used To Declare Multi-Dimensional Arrays.

• When declare it more than one subscripts are given in it. It can store values equal to multiple of subscripts such that n (2,3) array can store 6 values.

Syntax: Dim <array name> (script1, script2…) As <Data Type>

Example: Dim matrix (3, 3) as Integer

Dim T (2, 3, 4, 2) As Double

Initializing Multi-Dimensional Array: Use Curly brackets to initialize Multi-Dimensional Array.

Dim n (3, 3) As Integer = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}