1. Lbound and Ubound Functions
Passing Arrays between Procedures and Returning an Array from a Function
Lbound and Ubound Functions

2. Lbound and Ubound Functions
The Lbound and Ubound functions enable you to test the upper and lower boundaries of an array when they are unknown to you.
Lbound returns the smallest available array subscript.
Ubound returns the largest available array subscript.
LBound(arrayname[, dimension])
UBound(arrayname[, dimension])
arrayname Required. Name of the array
dimension Optional; Variant (Long). Whole number indicating which dimension's upper bound is returned. Use 1 for the first dimension, 2 for the second, and so on. If dimension is omitted, 1 is assumed.

3. UBound and LBound Example
Dim Upper
Dim Lower
Dim MyArray(1 To 10, 5 To 15, 10 To 20)
Dim AnyArray(10)
Upper = UBound(MyArray, 1)
Upper = UBound(MyArray, 3)
Lower = LBound(AnyArray)
Lower = LBound(MyArray, 3)

4. Returning an Array from a Function
Private Sub Form_Load()
Dim b As Integer
Dim i As Integer
Dim ReturnArray() As Integer
ReturnArray() = ArrayFunction(b)
For i = 0 To Ubound(ReturnArray)
picOutput.Print ReturnArray(i)
Next
End Sub
Public Function ArrayFunction(b As Integer) As Integer()
Dim x(2) As Integer
x(0) = b
x(1) = b + 200
x(2) = b + b
ArrayFunction = x
End Function
This example also shows:
how to assign one array variable to another
an example of the Ubound function

5. Passing Arrays between Procedures
An entire local array can be passed to another procedure.
The name of the array, followed by an empty set of parentheses, must appear as an argument in the calling statement, and an array variable name of the same type must appear as a corresponding parameter in the procedure definition.

6. Private Sub cmdDisplay_Click()
Dim score(1 To 10) As Integer
Call FillArray(score())
picAverage.Cls
picAverage.Print "The average score is"; Sum(score()) / 10
End Sub
Private Sub FillArray(s() As Integer)
Dim i As Integer
For i = 1 to 10
s(i) = 90 + i
Next
Private Function Sum(s() As Integer) As Integer
Dim total As Integer, index As Integer
'Add up scores
total = 0
For index = 1 To 10
total = total + s(index)
Next index
Sum = total
End Function