Each dimension in an array has an upper and
lower bound, which determine the range of values that can be used as subscripts
for that dimension. Array class provides us functions to get the upper and lower
bound or minimum and maximum index value of an array.
When the bounds are specified in array
declarators:
- The lower bound is a specification expression.
- The upper bound is a specification expression or asterisk (*).
To get the lower bound of an array we use
GetLowerBound() funtion. It takes dimention as a parameter and returns the lower
bound of array.
To get the upper bound of an array we use
GetUpperBound() funtion. It takes dimention as a parameter and returns the upper
bound of array.
Example
Public Class Test
Public
Shared Sub Main()
Dim Names(5) As String
Dim Counter
As Integer
Console.WriteLine("LowerBound:
" & Names.GetLowerBound(0))
Console.WriteLine("UpperBound:
" & Names.GetUpperBound(0))
Console.WriteLine("Total
Length: " & Names.Length)
For Counter = 0
To Names.GetUpperBound(0)
Names(Counter) = "Position of the Value
= " & Counter
Next Counter
For Counter = 0
To Names.GetUpperBound(0)
Console.WriteLine("Position
of the Value = " & Counter)
Next Counter
Console.ReadLine()
End Sub
End Class
The Data array now has 30 elements, starting
from Data(0), which is how you refer to the first element, up to Data(29). 0 is
the lower bound of this array, and 19 is the upper bound, the lower bound of
every array index is 0.
You can find the upper bound of an array with
the GetUpperBound function, which makes it easy to loop over all the elements in
an array using a For loop like this:
For
Counter = 0 To Names.GetUpperBound(0)...
Output
