//  Birthdays.m  Copyright (c) Kari Laitinen

//  http://www.naturalprogramming.com

//  2013-07-15  Objective-C version of this file was created.
//  2013-07-15  Last modification.

/*
 This program uses class ISODate to calculate information about
 birthdays for a person. The file class_isodate_oc.h must be in the 
 same folder with this file when this program is compiled.

 Here is a sample execution of this program:

 Type in your date of birth in the form YYYY-MM-DD. 
 Use four digits for the year and two digits for the month 
 and day:  1976-08-02

   You were born on a Monday
   Here are your days to celebrate. You are

   10 years old on 1986-08-02 (Saturday)
   20 years old on 1996-08-02 (Friday)
   30 years old on 2006-08-02 (Wednesday)
   40 years old on 2016-08-02 (Tuesday)
   50 years old on 2026-08-02 (Sunday)
   60 years old on 2036-08-02 (Saturday)
   70 years old on 2046-08-02 (Thursday)
*/

#include  <stdio.h>
#import   <Foundation/Foundation.h>
#import   "class_isodate_oc.h"

int main( void )
{
   NSAutoreleasePool* autorelease_pool = [ [ NSAutoreleasePool alloc ] init ] ;

   char  date_of_birth_as_c_string[ 20 ] ;

   printf( "\n Type in your date of birth in the form YYYY-MM-DD. "
           "\n Use four digits for the year and two digits for the month "
           "\n and day:  " ) ;

   scanf( "%s", date_of_birth_as_c_string ) ;

   NSString* date_of_birth_as_nsstring =
   
      [ NSString stringWithUTF8String: date_of_birth_as_c_string ] ;

   ISODate*  date_of_birth =
            [ [ ISODate alloc ] init_with_string: date_of_birth_as_nsstring ] ;

   NSString* text_to_print =
   
      [ NSString stringWithFormat:
      
         @"\n   You were born on a %@"
         @"\n   Here are your days to celebrate. You are\n",
         [ date_of_birth get_day_of_week ]
      ] ;
      
   printf( "%s", [ text_to_print UTF8String ] ) ;
   
   int  years_to_celebrate  =  10 ;

   while ( years_to_celebrate  <  80 )
   {
      ISODate* date_to_celebrate =
      
      [ [ ISODate alloc ] init_year: [ date_of_birth year ] + years_to_celebrate
                          and_month: [ date_of_birth month ]
                          and_day:   [ date_of_birth day ] ] ;

      text_to_print =
         [ NSString stringWithFormat:
            @"\n   %d years old on %@ (%@)",
            years_to_celebrate, date_to_celebrate,
            [ date_to_celebrate get_day_of_week ]
         ] ;

      printf( "%s", [ text_to_print UTF8String ] ) ;

      years_to_celebrate  =  years_to_celebrate  +  10 ;
   }

   printf( "\n\n" ) ;

   [ autorelease_pool drain ] ;
}