/* File: rec2.c
   Records and functions
*/

typedef struct tag {
   int hour ;
   int minute ;
} time_t ;

time_t add50(time_t when) {

   when.minute += 50 ;
   return when ;
}

main() {
  time_t start, stop ;

  printf("First Run ...\n") ;
  start.hour = 2 ;
  start.minute = 4 ;

  stop = add50(start) ;

  printf ("Start at %d:%02d, stop at %d:%02d\n", 
     start.hour, start.minute, stop.hour, stop.minute) ;

  printf("Second Run ...\n") ;
  start.hour = 3 ;
  start.minute = 30 ;

  stop = add50(start) ;

  printf ("Start at %d:%02d, stop at %d:%02d\n", 
     start.hour, start.minute, stop.hour, stop.minute) ;
}