local
  fun fbstr i =
      case (i mod 3 = 0, i mod 5 = 0) of
          (true , true ) => "FizzBuzz"
        | (true , false) => "Fizz"
        | (false, true ) => "Buzz"
        | (false, false) => Int.toString i

  fun fizzbuzz' (n, j) =
      if n = j then () else (print (fbstr j ^ "\n"); fizzbuzz' (n, j+1))
in
  fun fizzbuzz n = fizzbuzz' (n, 1)
  val _ = fizzbuzz 100
end