void say(const int n)
/* This function is guaranteed to work for numbers 0 to 99,
   and nothing I do to it, after point A, can possibly vhange that. */
{ if (n < 0)
    print("User error: number out of range");
  else if (n < 20)
    print(smalls[n]);
  else if (n < 100)
  { const int digit1 = n / 10;
    const int digit2 = n % 10;
    print(tens[digit1]);
    if (digit2 != 0)
    { print("-");
      say(digit2); } }
  else
    /* point A */
    print("I don't know how to say that"); }