Microsoft Office Tutorials and References
In Depth Information
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Using an indefinite number of arguments
Some of the Excel worksheet functions take an indefinite number of arguments. A familiar example is the SUM
function, which has the following syntax:
SUM(number1,number2...)
The first argument is required, but you can have as many as 254 additional arguments. Here's an example of a
formula that uses the SUM function with four range arguments:
=SUM(A1:A5,C1:C5,E1:E5,G1:G5)
You can mix and match the argument types. For example, the following example uses three arguments — a
range, followed by a value, and finally an expression:
=SUM(A1:A5,12,24*3)
You can create Function procedures that have an indefinite number of arguments. The trick is to use an array as
the last (or only) argument, preceded by the keyword ParamArray.
ParamArray can apply only to the last argument in the procedure. It is always a variant
data type, and it is always an optional argument (although you don't use the Optional
keyword).
A simple example of indefinite arguments
The following is a Function procedure that can have any number of single-value arguments. It simply returns
the sum of the arguments.
Function SIMPLESUM(ParamArray arglist() As Variant) As Double
Dim arg as Variant
For Each arg In arglist
SIMPLESUM = SIMPLESUM + arg
Next arg
End Function
The following formula returns the sum of the single-cell arguments:
=SIMPLESUM(A1,A5,12)
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