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'Display the Results Print Print Print Print Print , , "Values", "Deviations" Print For i = 1 To n Print , , Format(x(i, 1), "###.#"), Format(x(i, 2), "##.##") Next i Print Print , , "Average = "; Format(Average, "###.#") Print Print , , "Sum of Deviations = "; Format(Sum, "Scientific") End Sub Private Sub Command2_Click() 'Clear the Form Cls ReDim x(n, 2) Command2.Enabled = False End Sub Private Sub Command3_Click() End End Sub
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Note that the code is smaller than in Example 8.11, since an If-Then-Else block has been removed from event procedure Command1_Click and a double loop has been removed from event procedure Command2_Click. When the program is executed, it behaves in exactly the same manner as the program presented in Example 8.11, except that we can now process larger lists of numbers. Fig. 8.17 shows the results obtained when processing the exam scores for twelve students.
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8.6 ARRAY-RELATED FUNCTIONS Visual Basic includes several array-related library functions, as summarized in Table 8.1 below. These functions are rarely needed in simple programs, but they can be very useful in more complex programs, where it may be necessary to create arrays or to determine array properties during program execution.
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Table 8.1 Array-Related Library Functions Function
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Array
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Application
Dim x As Variant x = Array(3, 0.2, "OK")
Description
Creates a variant-type array. The arguments represent array elements. For example, x is a 3-element array containing an integer value (x(0) = 3), a single-precision value (x(1) = 0.2), and a string (x(2) = "OK").
IsArray
If IsArray(x) Then Returns a True/False value that is True if the argument is MsgBox "Array Defined" an array, and False otherwise. Else MsgBox "Array Undefined" Dim x(3 To 10) y = LBound(x) Dim c(3 To 10, 5 To 20) y = LBound(c, 2)
LBound
Returns the subscript lower limit of the array argument. If the array is multidimensional, LBound returns the lower limit of the subscript indicated by its second argument. Returns the subscript upper limit of the array argument. If the array is multidimensional, UBound returns the upper limit of the subscript indicated by its second argument.
UBound
Dim x(3 To 10) y = UBound(x) Dim c(3 To 10, 5 To 20) y = UBound(c, 2)
EXAMPLE 8.15
Here is a Visual Basic code segment that illustrates the use of the array-related library functions Array, IsArray, LBound and UBound.
Dim x As Variant, x1 As Variant, x2 As Variant, x3 As Variant, x4 As Variant Dim i1 As Integer, i2 As Integer x = Array(3, 0.2, "OK") . . . . . If IsArray(x) Then 'is x an array i1 = LBound(x) i2 = UBound(x) x1 = x(LBound(x)) x2 = x(UBound(x)) x3 = x(LBound(x) + 1) x4 = x(UBound(x) 2) End If
When executed, this code segment will result in the following assignments:
i1 = 0 i2 = 2 x1 = 3
(array lower bound) (array upper bound) (first array element)
x2 = "OK" x3 = 0.2 x4 = 3
(last array element) (second array element) (first array element)
ARRAYS
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8.7 CONTROL ARRAYS Multiple controls of the same type can be grouped into an array, in the same manner as a collection of data items. Such a grouping is known as a control array. Under certain conditions, the control array elements may share a common event procedure, using an index (i.e., a subscript value) to distinguish one control from another. Control arrays are created at design time (i.e., at the time controls are added to the Form Design Window). Additional control array elements can also be added and later deleted at run time (when the program is executed). A control array can be created by placing a control within the Form Design Window and assigning a value of 0 to its Index property. Then copy and paste the control, resulting in a new control with the same name (but an index value of 1) in the upper left corner of the Form Design Window. You may then drag the new control to its desired location within the Form Design Window. This process may be repeated as many times as you wish. Each repetition will result in a new control (i.e., a new element) within the control array. Remember that all of the control array elements will share the same name, but are distinguishable by the value of their index. The captions will also be the same, when the control array is created in this manner.
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