(* simple-clock.ml
   Repeatedly prints the current time at the standard output,
   at intervals of 1 sec

   How to compile:

   ocamlopt unix.cmxa simple-clock.ml -o simple-clock
*)

open Unix

let print_tm tm =
  print_int tm.tm_hour;
  print_char ':';
  print_int tm.tm_min;
  print_char ':';
  print_int tm.tm_sec

let simple_clock () =
  while true do
    print_tm (Unix.localtime (Unix.time ()));
    print_newline ();
    ignore (Unix.select [] [] [] 1.0)
  done

let _ = simple_clock ()