zxing qr code encoder example c# Part 2: Visual Basic for Applications in C#.NET

Encoder QR Code ISO/IEC18004 in C#.NET Part 2: Visual Basic for Applications

Part 2: Visual Basic for Applications
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Microsoft Office Excel 2003 Programming Inside Out As you can see in the following code, the syntax for the two loops is straightforward:
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Do While condition
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[statement]
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[Exit Do]
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Loop
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Do Until condition [statement] [Exit Do] [statement] Loop
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condition statement Exit Do Loop
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A required numeric or string expression that must evaluate to True or False One or more optional statement lines that are executed during the loop Optional statement to exit the loop prematurely
Required statement to mark the end of the Do While or Do Until statement block
The Do While loop tests the condition first, before entering the loop, and executes while the condition is true. This example performs a simple counting loop, similar to a For Next statement:
Dim intCounter as Integer
intCounter = 1
Do While intCounter <= 10
intCounter = intCounter + 1 Loop
Part 2: Visual Basic for Applications
4
The following Do Until loop performs the same actions as the Do While loop, but notice how the condition expression has changed:
Dim intCounter as Integer
intCounter = 1
Do Until intCounter = 11
intCounter = intCounter + 1 Loop
Both examples run a simple counting loop from 1 to 10. In these two examples, it is easier to figure out that the Do While loop is counting from 1 to 10. The Do Until loop appears to be counting to 11, but the action is not performed once the counter reaches 11. It is last performed with a value of 10. The Do Loop While and Do Loop Until loops are similar to each other, just as they are sim ilar to the Do While and Do Until loops mentioned earlier. Both check the conditional expres sion at the end of the loop, guaranteeing at least one pass through the loop. Again, Do Loop While loops while the condition is true, and Do Loop Until loops while the condition is false. The syntax declarations for them are shown here: 80
VBA Programming Starter Kit
[statement]
[Exit Do]
[statement]
Loop While condition
[statement]
[Exit Do]
[statement]
Loop Until condition
condition statement Exit Do Loop
Required expression that must evaluate to True or False One or more optional statement lines that are executed during the loop Optional statement to exit the loop prematurely
Required statement to mark the end of the Do While or Do Until statement
block The following example increments a counter during each pass through the loop and uses a message box to ask the user if they wish to continue:
Sub PermissionLoop()
Dim intCounter As Integer, strPrompt As String
Dim intResult As Integer
intCounter = 0
Do intCounter = intCounter + 1 strPrompt = "You have looped" & Str$(intCounter) & " times." _ & vbCrLf & "Do you wish to continue " intResult = MsgBox(strPrompt, vbYesNo + vbExclamation) Loop While intResult = vbYes End Sub
And here is the same example, using the Do Loop Until statement:
Sub PermissionLoop2()
Dim intCounter As Integer, strPrompt As String
Dim intResult As Integer
intCounter = 0
Do intCounter = intCounter + 1 strPrompt = "You have looped" & Str$(intCounter) & " times." _ & vbCrLf & "Do you wish to continue " intResult = MsgBox(strPrompt, vbYesNo + vbExclamation) Loop Until intResult = vbNo End Sub
Part 2: Visual Basic for Applications
4
Microsoft Office Excel 2003 Programming Inside Out
GoTo Statement
The GoTo statement forces the procedure to change immediately to another section of the procedure unconditionally. The section of code that is to be branched to needs to be marked with either a line number or a line label, allowing the program to jump either forward or backward within the procedure. Using the GoTo statement is discouraged because it can cause procedures to become more difficult to understand and debug. The syntax for the GoTo statement is shown here:
GoTo line
In the preceding code, line is a required line label that must be a line number or a line label that is defined within the same procedure. Line numbers can be any series of digits and must begin in the first column. Line labels can be any series of characters that starts with a letter and ends with a colon (:). Line labels are not case sensitive and must begin in the first column. Because GoTo statements can lead to unstructured code, using them is strongly discouraged. If used sparingly, they can be very useful. The following section on error handling offers bet ter understanding of when and how to use the GoTo statement and line labels.
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