I have defined ! (factorial) function and registered it as arithmetic function and an operator, so that I can execute: A is 6!.
Now I'd like to define !! (factorial of odd numbers), but the same way - writing clauses, registering arithmetic_function and operator, calling A is 7!! - results in
SyntaxError: Operator expected
How should I, if possible, register !! operator ?
Yes, I realize, ! is normally the cut.