#include "library.h"

void print_0_to_19(const int d)
{ if (d == 0)
    print("zero");
  else if (d == 1)
    print("one");
  else if (d == 2)
    print("two");
  else if (d == 3)
    print("three");
  else if (d == 4)
    print("four");
  else if (d == 5)
    print("five");
  else if (d == 6)
    print("six");
  else if (d == 7)
    print("seven");
  else if (d == 8)
    print("eight");
  else if (d == 9)
    print("nine");
  else if (d == 10)
    print("ten");
  else if (d == 11)
    print("eleven");
  else if (d == 12)
    print("twelve");
  else if (d == 13)
    print("thirteen");
  else if (d == 14)
    print("fourteen");
  else if (d == 15)
    print("fifteen");
  else if (d == 16)
    print("sixteen");
  else if (d == 17)
    print("seventeen");
  else if (d == 18)
    print("eighteen");
  else if (d == 19)
    print("nineteen");
  else 
    print("\n**** ERROR ****\n"); }

void print_Xty(const int d)
{ if (d == 20)
    print("twenty");
  else if (d == 30)
    print("thirty");
  else if (d == 40)
    print("forty");
  else if (d == 50)
    print("fifty");
  else if (d == 60)
    print("sixty");
  else if (d == 70)
    print("seventy");
  else if (d == 80)
    print("eighty");
  else if (d == 90)
    print("ninety");
  else 
    print("\n**** ERROR ****\n"); }

void print_20_to_99(const int n)
{ if (n < 20)
    print_0_to_19(n);
  else
                         // example:   if     n    is 47
                         //          then  n/10*10 is 40
                         //           and   n%10   is  7
  { print_Xty(n/10*10);
    if (n % 10 != 0)
      print_0_to_19(n%10); } }

void main()
{ print_20_to_99(27);
  new_line();
  print_20_to_99(38);
  new_line();
  print_20_to_99(59);
  new_line();
  print_20_to_99(99);
  new_line();
  print_20_to_99(12);
  new_line();
  print_20_to_99(40);
  new_line(); }