#include "library.h"

void internal_print_digits(const int N)
{ const int last_digit = N - N / 10 * 10;
                                           // that is equivalent to last_digit = N % 10;
  const int all_of_N_except_the_last_digit = N / 10;

  if (all_of_N_except_the_last_digit != 0)
  { internal_print_digits(all_of_N_except_the_last_digit);
    print(" "); }
  print(last_digit); }

void print_digits(const int N)
{ if (N < 0)
  { print("- ");
    internal_print_digits(- N); }
  else
    internal_print_digits(N); }

void test()
{ print("type an int ");
  const int value = read_int();
  print_digits(value);
  new_line();
  test(); }

void main()
{ test(); }