My past research peaked my interest in the command line tool dbish. So my answers are as follows.

>Update: So now you need to research three things.

>How would you prompt a user for input?

via dbish (or DBI::Shell interface)

>How to get the user input?

via dbish (or DBI::Shell interface)

>How do you pass the user input into your function?

I'm thinking that there should already be code that has performed the ->func method.

I'm hoping to be able to type into the dbish interface something like this:

select 3 as oposite, 4 as adjacent, sqrt(3,4) as hyp

and get

3 4 5

as a result.