'Let's learn about the ubound method'

ubound method is one of the functions in Visual Basic, used in arrays to return the upper bound of the array (that is, the maximum index value). Its specific syntax and usage are as follows:

UBound(array name, [dimension])

Among them, the array name is the name of the array to obtain the upper bound. dimensions is an optional option that specifies the specific dimensions of the array for which the upper bound is to be obtained. If the dimension is not specified, the default is 1, which is to obtain the upper bound of the first dimension.

The ubound method returns an integer, representing the upper bound index value of the array. For a one-dimensional array, it represents the index position of the last element of the array.

The following is a specific code example showing the use of the ubound method:

Sub TestUBound()
    Dim arr() As Integer
    Dim upperBound As Integer

    '初始化数组
    arr = Array(1, 2, 3, 4, 5)

    '获取一维数组的上界
    upperBound = UBound(arr)

    '输出上界值
    MsgBox "一维数组的上界为：" & upperBound

    '更改数组的上界
    ReDim Preserve arr(1 To 6)

    '获取更新后的上界
    upperBound = UBound(arr)

    '输出新的上界值
    MsgBox "更新后的一维数组的上界为：" & upperBound
End Sub

In the above example code, we first declare an array arr of integer type. Then, use the Array function to initialize a one-dimensional array containing 5 elements.

Next, in the first MsgBox statement, we call UBound(arr) to get the upper bound of the array and store the result in the variable upperBound. Then, a dialog box pops up to display the upper bound value.

Then, use the ReDim Preserve statement to expand the size of the array to the range of 1 to 6, adding a new element.

Finally, in the second MsgBox statement, we call UBound(arr) again to get the updated array upper bound and store the result in the upperBound variable. The dialog box pops up again to show the new upper bound value.

Through the above code examples, we can clearly understand the role and usage of the ubound method.

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