(********************************************************************)
(*  OCaml code from the book ``Learn Programming with OCaml''       *)
(*  See https://usr.lmf.cnrs.fr/lpo/                                *)
(*                                                                  *)
(*  Sylvain Conchon and Jean-Christophe Filliâtre                   *)
(*  Copyright 2025 Université Paris-Saclay and CNRS                 *)
(*                                                                  *)
(*  Openly licensed via CC BY SA 4.0                                *)
(*  See https://creativecommons.org/licenses/by-sa/4.0/deed.en      *)
(********************************************************************)

(* Program 1 on page 8
   Leap Years *)

let year = read_int ()
let leap =
  (year mod 4 = 0 && year mod 100 <> 0) || year mod 400 = 0
let msg = if leap then "is" else "is not"
let () = Printf.printf "%d %s a leap year\n" year msg

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