Description
An Array is a Collection of Elements which are stored in continuous memory locations. All the elements in the array belong to the same datatype.Elements in the array start with the value '0' and this element is called as Lowest or First Element in the array.Ending element will be called as Higher or Last element.Following are the types of arrays.
- Multi Dimension Array
- Dynamic Array
- Jagged Array
Conceptual
figure
Syntax
The following code shows you the syntax of an array.
Dim Array_Name() As Datatype = {Element[0],Element[1],..Element[N]}
Example
Following is a basic example to declare an array.
[vbnet]Dim Names As String= {"Welcome","To","SPlessons"}[/vbnet]
Description
Multi Dimensional arrays are used to declare two or more dimensions for an array.Following are the syntax and basic example to describe multi dimensional array.
Dim Array_Name(,) As Datatype = {{Element[0],Element[0]},{Element[1],Element[1]},..{Element[N],Element[N]}
[vbnet]Dim a(,) As Integer = {{0, 0}, {1, 2}, {2, 4}, {3, 6}, {4, 8}}[/vbnet]
Example
[vbnet]
Module Module1
Sub Main()
' an array with 5 rows and 2 columns
Dim a(,) As Integer = {{0, 0}, {1, 2}, {2, 4}, {3, 6}, {4, 8}}
Dim i, j As Integer
' output each array element's value '
For i = 0 To 4
For j = 0 To 1
Console.WriteLine("a[{0},{1}] = {2}", i, j, a(i, j))
Next j
Next i
Console.ReadKey()
End Sub
End Module
[/vbnet]
Output:
Following is a 2-dimensional array output.
Description
Jagged Array means Array of Arrays. That means elements in the array are also arrays.Following is a syntax to declare a jagged array.
Dim scores As Integer()() = New Integer(5)()
{
}
Example
[vbnet]Module Module1
Sub Main()
'a jagged array of 5 array of integers
Dim a As Integer()() = New Integer(4)() {}
a(0) = New Integer() {0, 0}
a(1) = New Integer() {1, 2}
a(2) = New Integer() {2, 4}
a(3) = New Integer() {3, 6}
a(4) = New Integer() {4, 8}
Dim i, j As Integer
' output each array element's value
For i = 0 To 4
For j = 0 To 1
Console.WriteLine("a[{0},{1}] = {2}", i, j, a(i)(j))
Next j
Next i
Console.ReadKey()
End Sub[/vbnet]
Output:
Following is an output in console.
Properties
The following table shows you the different properties of the arrays.
| Properties | Description |
|---|---|
| Is Fixed Size | Used to Check Wheater Array Is in Fixed size or not |
| Length | Used to Get total number of elements in array(32bit Integer) |
| Rank | Used to Get number of dimensions |
| LongLength | Used to Get total number of elements in array(64bit Integer) |
| IsReadOnly | Used to Check Wheater Array is in Read-Only or not |
Methods
The following are the different properties of the arrays.
| Methods | Description |
|---|---|
| Clear (Array, Index, Length) | Used to elements in the Array |
| Sort (Array) | Used to sort the elements in one-dimensional Array |
| Reverse (Array) | Used to get the reverse order of elements in Array |
| Copy (sourceArray,destinationArray,Length) | Used to copy one Array to another Array based on length |
| Get Type | Used to get the type of element |
| SetValue (Value, Index) | Used to sets the elements at the specified position(32bit Integer) |
| Get Value | Gets the value at the specified position (32bit Integer) |
| Copy To (Array, Index) | Used to copy current one-dimensional array to the specified one-dimensional array |
| Get Length (Dimensions) | Used to represent the number of elements (32bit Integer) |
Points
- Redim statement is used to declare dynamic array.
- Preserve is a keyword in Redim statement syntax.
- Rectangular array is an another name of multi dimensional array.