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Please Note: This article is written for users of the following Microsoft Excel versions: 97, 2000, 2002, and 2003. If you are using a later version (Excel 2007 or later), this tip may not work for you. For a version of this tip written specifically for later versions of Excel, click here: Understanding the Select Case Structure.
Macros in Excel are written in a language called Visual Basic for Applications (VBA). Like any other programming language, VBA include certain programming structures which are used to control how the program executes. One of these structures is the Select Case structure. This structure has the following syntax:
Select Case expression Case expression program statements Case expression program statements Case Else program statements End Select
When a macro is executing, and this structure is encountered, Excel uses the expression to test each subsequent Case statement to see if the code under the Case statement should be executed. For instance, consider the following code:
Select Case DayOfWeek Case 1 DayName = "Monday" Case 2 DayName = "Tuesday" Case 3 DayName = "Wednesday" Case 4 DayName = "Thursday" Case 5 DayName = "Friday" Case 6 DayName = "Saturday" Case 7 DayName = "Sunday" Case Else DayName = "Unknown day" End Select
This code assumes you enter it with DayOfWeek already set to a numeric value. Let's say (for example's sake) the value is 4. In this structure, the only code that would be executed is the code under the Case 4 statement—in other words, the macro would set DayName to "Thursday." If DayOfWeek were set to some other value not accounted for by the Case statements (outside of the 1 to 7 range), then the code under Case Else would execute, and the macro would set DayName to "Unknown day."
ExcelTips is your source for cost-effective Microsoft Excel training. This tip (2262) applies to Microsoft Excel 97, 2000, 2002, and 2003. You can find a version of this tip for the ribbon interface of Excel (Excel 2007 and later) here: Understanding the Select Case Structure.
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