//  Friday13.java  (c) 1997-2005 Kari Laitinen

//  http://www.naturalprogramming.com

//  2002-01-07  File created.
//  2005-07-25  Last modification.

//  When this program is compiled, Date.java and DateDistance.java
//  must be in the same folder (directory) together with this file.

import java.util.Scanner ;

class Friday13
{
   public static void main( String[] not_in_use )
   {
      Scanner keyboard = new Scanner( System.in ) ;

      System.out.print(
          "\n This program can print you a list of 10 dates"
        + "\n that are Fridays and 13th days of a month."
        + "\n Please, type in a date from which you want"
        + "\n the calculation to begin. Type in the date either"
        + "\n in form DD.MM.YYYY or in form MM/DD/YYYY and use"
        + "\n two digits for days and months and four digits"
        + "\n for the year:  "  ) ;

      String  given_date_as_string  =  keyboard.nextLine() ;

      Date date_to_increment  =  new Date( given_date_as_string ) ;

      int   number_of_friday13_dates_to_print  =  10 ;

      System.out.print( "\n It is a common belief that you may have"
                     +  "\n bad luck on the following dates:\n"  ) ;

      while ( number_of_friday13_dates_to_print  >  0 )
      {
         while ( date_to_increment.index_for_day_of_week()  !=  4  ||
                 date_to_increment.day()  !=  13   )
         {
            date_to_increment.increment() ;
         }

         System.out.print( "\n    "  +  date_to_increment  +  ", "
                        +  date_to_increment.get_day_of_week() ) ;

         date_to_increment.increment() ;
         number_of_friday13_dates_to_print  --  ;
      }
   }
}