Adding 110 5gives. 6

Note that, in general, any parameters to a function must be enclosed in parentheses within the function call.

In order to return a value from a function, we must assign the function's name to the return value somewhere within the body of the function. Example 6-2 shows a slightly more complicated example of a function.

Example 6-2. Assigning a Function's Return Value

Function ReturnCount() As Variant

' Return count of cells in current selection

If TypeName(Selection) = "Range" Then

ReturnCount = Selection.Count Else

ReturnCount = "Not applicable" End If End Function

This function returns a count of the number of cells in the current selection, provided that the selection is a range of cells. If the selection is another type of object (such as a chart), the function returns the words "Not applicable." Note that since the return value may be a number or a string, we declare the return type as Variant. Note also that ReturnCount is assigned twice within the body of the function. Its value, and hence the value of the function, is set differently depending upon the value returned by the TypeName(Selection) function. Since these assignments are mutually exclusive, only one of them will occur each time the function is called.

Because functions return values, you can't call them directly from the Macro dialog that appears when you select Tools Macro Macros, nor can you assign them to an Excel toolbar or menu through Excel's user interface. If you want to be able to call a function, you'll have to "wrap" it in—that is, have it called by—a subroutine, the topic that we'll cover next.

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