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The following code fragments show examples of using the If Then Else statement to determine if a person s age allows them to vote:
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If intAge >= 18 Then boolAllowVote = True Else boolAllowVote = False End If If boolAllowVote Then [Display ballot and record vote] End If intReturn = MsgBox("Do you wish to continue ", vbYesNo + vbExclamation, "My App") If intReturn = vbYes Then [Continue processing] Else [Exit Procedure] End If
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Select Case Statements
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Select Case statements allow you to check for multiple values at once. Suppose you had to cal culate different values depending upon what month it was. You would need to write eleven If Then Else statements to check for all twelve months, but using a Select Case statement lets you drop the number of conditional statements to one, making your code easier to read and maintain. The syntax of the Select Case statement is shown here.
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Select [Case] testcondition [Case expressionlist [statements] ] [Case Else elsestatements End Select
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Part 2: Visual Basic for Applications
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testcondition
Required expression that must evaluate to one of the basic data types, such as Boolean, Integer, String, and so on.
expressionlist
A list of expression clauses representing values for testexpression. Multiple expression clauses are separated by commas and can take one of the following forms: Used to represent a range of values from Expression1 to Expression2. Expression1 must be less than Expression2. comparisonoperator is used to specify a restric
Expression1 To Expression2
[Is] comparisonoperator Expression
tion on the value of Expression.
Expression
The expressions in expressionlist can be any data type so long as they are implicitly convertible to the type of test condition.
Statements
One or more statements that are executed if the testexpression matches any clause in expressionlist. One or more statements that are executed if the testexpression does not match any clause in expressionlist. Required to mark the end of the Select Case block.
else statements End Select
The following code fragment demonstrates using the Select Case statement to set a variable to the number of days in each month.
Select Case strMonth Case "February" intDays = 28 Case "April", "June", "September", "November" intDays = 30 Case "January", "March", "May", "July", "August", "October", "December" intDays = 31 End Select
Part 2: Visual Basic for Applications
4
This preceding code is just a simple example of specifying the number of days in a month, but does not make any provisions for leap years. More code can be added to the February clause to properly set the number of days in February, as in the following code:
Case "February" If (intYear Mod If (intYear intDays Else intDays End If Else If (intYear intDays 100) = 0 Then Mod 400) = 0 Then = 29 = 28
Mod 4) = 0 Then = 29
VBA Programming Starter Kit
Else intDays = 28 End If End If
This example also shows how you can mix If Then Else statements inside a Select Case statement.
Loops
There will be numerous times when you ll need to perform a certain task several times, so VBA provides several methods of creating loops. Loops can be divided into two categories: iteration loops and logical loops.
Iteration Loops
Iteration loops, which are used to ensure that a specific number of repetitions have occurred, have a definitive starting point and ending point. There are two iteration loops, both similar in style and syntax. The first type of iteration loop, the For Next loop, is normally used for counting and is par ticularly useful with arrays. The syntax of a For Next loop is shown here.
For counter = start To end [Step step] [statements] [Exit For] [statements] Next counter
counter start end step
Required numeric variable that is used as a counter. It can t be a Boolean or member of an array. Required value used as the starting point of the array. Required value used as the ending point of the array.
Optional value by which the counter should be incremented during each itera tion of the loop. Step value can be a positive or negative value. Default value is 1. 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.
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