/*  BadLuckDays.kt  Copyright (c) Kari Laitinen

    http://www.naturalprogramming.com

    2020-10-31  File created.
    
    If you want to insert a dollar sign into a Kotlin string,
    you need to write it like "${'$'}"
*/

import java.time.*

fun main()
{
   val date_of_today = LocalDate.now()

   // First we create a LocalDate object that contains the 13th day
   // of current month. This program can also print this, possibly
   // past, date.

   var date_to_check = LocalDate.of( date_of_today.getYear(),
                                     date_of_today.getMonthValue(),
                                     13 )

   var number_of_friday13_dates_to_print = 10

   print( "\n The following are Fridays which also are"
        + "\n the 13th days of a month: \n\n" )

   while ( number_of_friday13_dates_to_print  >  0 )
   {
      if ( date_to_check.getDayOfWeek() == DayOfWeek.FRIDAY )
      {
         print( String.format( "   %1${'$'}tF, %1${'$'}tA\n", date_to_check ) )
         number_of_friday13_dates_to_print  -- 
      }

      // The following statement creates a new LocalDate object that
      // contains the 13th day of the following month.

      date_to_check = date_to_check.plusMonths( 1 )
   }
   
   print( "\n\n" )
}