#include <library.h>

/* a slight change to illustrate a very useful thing: arrays */

const string names[] = { "zero", "one", "two", "three", "four",
                         "five", "six", "seven", "eight", "nine" };

void thing(const int N)
{ const int Q = N / 10,
            R = N % 10;
  if (Q > 0)
  { thing(Q);
    print(" "); }
  print(names[R]); }

void test_it()
{ print("type a number (or -1 to stop) ");
  const int x = read_int();
  if (x != -1)
  { thing(x);
    print("\n");
    test_it(); } }

void main()
{ test_it(); }