/* ECP: FILEname=fig9_5.c */
/* 1*/   /* Find All Friday The 13th Birthdays */
/* 2*/   /* For Person Born On Nov. 13, 1973 */

/* 3*/   #include <time.h>
/* 4*/   #include <stdio.h>

/* 5*/   main( void )
/* 6*/   {
/* 7*/       const Friday = 6 - 1;            /* Sunday Is 0, Etc... */
/* 8*/       struct tm TheTime = { 0 };       /* Set All Fields To 0 */
/* 9*/       int Year;

/*10*/       TheTime.tm_mon = 11 - 1;         /* January Is 0, Etc... */
/*11*/       TheTime.tm_mday = 13;            /* 13th Day Of The Month */

/*12*/       for( Year = 1973; Year < 2073; Year++ )
/*13*/       {
/*14*/           TheTime.tm_year = Year - 1900; /* 1900 Is 0, Etc... */
/*15*/           if( mktime( &TheTime ) == -1 )
/*16*/           {
/*17*/               printf( "mktime failed in %d\n", Year );
/*18*/               break;
/*19*/           }
/*20*/           if( TheTime.tm_wday == Friday )
/*21*/               printf( "%s", asctime( &TheTime ) );
/*22*/       }

/*23*/       return 0;
/*24*/   }