#include "library.h"

void speak(int N)
{ if (N < 0)
  { print("minus ");
    speak(-N); }
  else if (N == 0)
    print("zero");
  else if (N == 1)
    print("one");
  else if (N == 2)
    print("two");
  else if (N == 3)
    print("three");
  else if (N == 4)
    print("four");
  else if (N == 5)
    print("five");
  else if (N == 6)
    print("six");
  else if (N == 7)
    print("seven");
  else if (N == 8)
    print("eight");
  else if (N == 9)
    print("nine");
  else if (N == 10)
    print("ten");
  else if (N == 11)
    print("eleven");
  else if (N == 12)
    print("twelve");
  else if (N == 13)
    print("thirteen");
  else if (N == 14)
    print("fourteen");
  else if (N == 15)
    print("fifteen");
  else if (N == 16)
    print("sixteen");
  else if (N == 17)
    print("seventeen");
  else if (N == 18)
    print("eighteen");
  else if (N == 19)
    print("nineteen");
  else if (N == 20)
    print("twenty");
  else if (N == 30)
    print("thirty");
  else if (N == 40)
    print("forty");
  else if (N == 50)
    print("fifty");
  else if (N == 60)
    print("sixty");
  else if (N == 70)
    print("seventy");
  else if (N == 80)
    print("eighty");
  else if (N == 90)
    print("ninety");
  else if (N <= 99)
  { speak(N / 10 * 10);
    print("-");
    speak(N % 10); }
  else if (N <= 999)
  { speak(N / 100);
    print(" hundred");
    if (N % 100 != 0)
    { print(" and ");
      speak(N % 100); } }
  else if (N <= 999999)
  { speak(N / 1000);
    print(" thousand");
    const int rest = N % 1000;
    if (rest == 0)
    { }
    else if (rest < 100)
    { print(" and ");
      speak(rest); }
    else
    { print(" ");
      speak(rest); } }
  else if (N <= 999999999)
  { speak(N / 1000000);
    print(" million");
    const int rest = N % 1000000;
    if (rest == 0)
    { }
    else if (rest < 100)
    { print(" and ");
      speak(rest); }
    else
    { print(" ");
      speak(rest); } }
  else /* ints on this computer only go up to 2,147,483,647 */
  { speak(N / 1000000000);
    print(" billion");
    const int rest = N % 1000000000;
    if (rest == 0)
    { }
    else if (rest < 100)
    { print(" and ");
      speak(rest); }
    else
    { print(" ");
      speak(rest); } } }

void main()
{ print("type numbers and I'll speak them.\n");
  while (true)
  { print("? ");
    int number = read_int();
    speak(number);
    print("\n"); }
  print("If you see this message, the computer is broken.\n"); }