Create a custom worksheet function in Excel VBA

Question

I have a faint memory of being able to use VBA functions to calculate values in Excel, like this (as the cell formula):

=MyCustomFunction(A3)

Answer 1

The word input needs to be replaced as it is a basic keyword. Try num instead. You can also go further by specifying a type, eg variant.

Function MyCustomFunction(num As Variant)
    MyCustomFunction = 42 + num
End Function