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You can omit the counter variable used within the Next statement, but it isn t recommended. By including the counter, you add an extra level of protection against programming errors.
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Part 2: Visual Basic for Applications
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Microsoft Office Excel 2003 Programming Inside Out As stated earlier, a For Next loop ensures that a specific number of repetitions are performed. Suppose you had an array of 26 elements, and you wanted to set each one to its cor responding letter of the alphabet. A For Next loop provides the perfect means to accomplish this. The following code creates a 26-member array, assigns a letter of the alphabet to each element, and then builds a message box to display those elements.
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Sub Dim Dim Dim For AlphabetArray()
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strABC(1 To 26) as String
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intCounter as Integer
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strPrompt as String
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intCounter = 1 to 26
strABC(intCounter) = Chr$(intCounter + 64) Next intCounter strPrompt = "The strABC array contains the following values:" & vbCrLf For intCounter = 1 to 26 strPrompt = strPrompt & strABC(intCounter) Next intCounter MsgBox strPrompt End Sub
For Next loops can be nested inside one another, so you can build even more complex iter ations. The following example modifies the previous example by building a two-dimensional array and displaying the elements of the array backward:
strABC(100 To 101, 1 To 26) As String
intCounter1 As Integer, intCounter2 As Integer
strPrompt As String
intCounter1 = 100 To 101
For intCounter2 = 1 To 26 strABC(intCounter1, intCounter2) = Chr$(intCounter2 + 64) Next intCounter2 Next intCounter1 strPrompt = "The strABC array contains the following values:" For intCounter1 = 100 To 101 strPrompt = strPrompt & vbCrLf & "Dimension" & Str$(intCounter1) & ": " For intCounter2 = 26 To 1 Step -1 strPrompt = strPrompt & strABC(intCounter1, intCounter2) Next Next intCounter1 MsgBox strPrompt Dim Dim Dim For
Part 2: Visual Basic for Applications
4
The other iteration loop, the For Each Next loop, is used with collections of objects or arrays, ensuring that each member of the group is touched upon. It has syntax very similar to the For Next loop.
For Each element In group [statements] [Exit For] [statements] Next element
VBA Programming Starter Kit
element group
Required object or variant variable that is used to point to each member of the group. Array loops require a variant variable regardless of the data type of the array. Required collection of objects or array containing the elements that will be affected by the loop.
statements Exit For
One or more optional statement lines that are executed during each iter ation of the loop. Optional statement used to exit the loop prematurely. Code execution resumes at the first line following the Next counter statement. Required statement marking the end of the For Next loop.
Next element
The For Each Next loop is a handy method of performing the same action to a collection of objects. (You will learn more about object collections and how to work with them in 6, 7, and 8.) If you wanted, for example, to rename all the worksheets in a workbook, you could use a For Each Next loop to ask the user for a name for each worksheet, rename it, and continue on to the next one until all of the worksheets were renamed.
Sub Dim Dim Dim RenameAllWorksheets()
myWorksheet As Worksheet
strPrompt As String, strResult As String
intCounter As Integer
intCounter = 0
strPrompt = "Please enter the new name for worksheet "
For Each myWorksheet In Application.Worksheets
strResult = InputBox(strPrompt & myWorksheet.Name) myWorksheet.Name = strResult intCounter = intCounter + 1 Next myWorksheet
strPrompt = "Total worksheets renamed =" & Str$(intCounter)
MsgBox strPrompt
End Sub
Logical Loops
Logical loops have no predetermined number of iterations. Instead, they rely on a logical expression that tests for a particular condition and then repeat the loop until the condition is either met or cleared, depending upon the type of loop. Although there are four forms of logical loops, they can be simplified into two styles: those that test the condition before performing an action and those that test the condition after performing an action. Within each style, the two loops differ in that one loops when the con dition is true and the other loops when the condition is false. The Do While Loop and Do Until Loop both test the condition before performing the action within the loop. The difference between the two is that Do While loops perform the action when the condition is true and Do Until loops perform the action while the condition is false. To decide which one to use, you need to find the simplest way to express the condi tion and then pick the loop that will best match the condition. 79
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