Please Note: This article is written for users of the following Microsoft Excel versions: 2007, 2010, 2013, and 2016. If you are using an earlier version (Excel 2003 or earlier), this tip may not work for you. For a version of this tip written specifically for earlier versions of Excel, click here: Understanding Subroutines.

Understanding Subroutines

by Allen Wyatt
(last updated November 28, 2015)

1

When you write macros in Excel, you use a programming language called Visual Basic for Applications (VBA). This is based on the BASIC programming language, with extensions specific to Excel. One of the features of the language is the capability to use subroutines in your programs. For instance, consider the following VBA macro:

Sub Macro1()
    TestSub
End Sub
Sub TestSub()
    MsgBox "In the subroutine"
End Sub

This simple macro (Macro1) does nothing but call a subroutine (TestSub), which in turn displays a message box to inform you that it is in the subroutine. When you click on OK to dismiss the message box, the subroutine ends and returns control to the main program. You can have as many subroutines in a VBA program as you desire. The purpose of each should be to perform common tasks so you don't have to rewrite the same code all the time.

You can also pass parameters to your subroutines. These parameters can then be acted upon by your subroutine. For instance, consider the following macro:

Sub Macro1()
    A = 1
    PrintIt A
End Sub
Sub PrintIt(x)
    MsgBox "Value: " & x
End Sub

This is a simple macro that sets a variable, and then passes it in a subroutine call to PrintIt. This subroutine displays the value of the variable in a message box, and then (after you press OK) returns to the calling program.

Notice that the subroutine does not use the same variable name as it was passed. This is because VBA reassigns the value of x (what the subroutine expects to receive) so that it matches the value of A (what the program is passing to the subroutine). The important thing to remember in passing parameters to subroutines is that your program must pass the same number of parameters as the subroutine expects, and that the parameters must be of matching types and in the proper order.

ExcelTips is your source for cost-effective Microsoft Excel training. This tip (11764) applies to Microsoft Excel 2007, 2010, 2013, and 2016. You can find a version of this tip for the older menu interface of Excel here: Understanding Subroutines.

Author Bio

Allen Wyatt

With more than 50 non-fiction books and numerous magazine articles to his credit, Allen Wyatt is an internationally recognized author. He  is president of Sharon Parq Associates, a computer and publishing services company. ...

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What is three more than 5?

2015-11-30 04:27:18

balthamossa2b

When passing variables as Sub arguments, it's preferable to declare its type. For example, in the macro above that would be

Sub PrintIt (x As String)


It also works without declaration, it's just that Excel will consider the variable a Variant. A Variant occupies more memory space, but more importantly not knowing which kind of variable goes in the macro can cause execution problems.

Like for example if you tried CInt(x) in the above macro.


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