> input:  string    "1.15.120.13.43.35.340.190.0"
> output: int array=  [| 1; 15; 120; 13; 43; 35; 340; 190; 0; |] 

That's easy:

let answer_to_the_exercise = function
    "1.15.120.13.43.35.340.190.0" -> 
                [| 1; 15; 120; 13; 43; 35; 340; 190; 0; |] 

I'm sure your professor will love this solution, as it is not only
correct w.r.t. the specification, but also quite concise.

- Xavier Leroy

P.S.1: this list isn't for doing student's homework.
P.S.2: the beginner's list http://groups.yahoo.com/group/ocaml_beginners
isn't either, but you might find more sympathy there.
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