fun iterative = int by int n
  int result = 1
  for int i = 2; i <= n; ++i do result *= i end
  return result
end
fun recursive = int by int n do return when(n <= 0, 1, n * recursive(n - 1)) end
writeLine("n".padStart(2, " ") + " " + "iterative".padStart(19, " ") + " " + "recursive".padStart(19, " "))
for int n = 0; n < 21; ++n
  write((text!n).padStart(2, " "))
  write(" " + (text!iterative(n)).padStart(19, " "))
  write(" " + (text!recursive(n)).padStart(19, " "))
  writeLine()
end