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compiler-libs-hack / ocaml / otherlibs / num / arith_status.mli

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(***********************************************************************)
(*                                                                     *)
(*                                OCaml                                *)
(*                                                                     *)
(*    Valerie Menissier-Morain, projet Cristal, INRIA Rocquencourt     *)
(*                                                                     *)
(*  Copyright 1996 Institut National de Recherche en Informatique et   *)
(*  en Automatique.  All rights reserved.  This file is distributed    *)
(*  under the terms of the GNU Library General Public License, with    *)
(*  the special exception on linking described in file ../../LICENSE.  *)
(*                                                                     *)
(***********************************************************************)

(* $Id$ *)

(** Flags that control rational arithmetic. *)

val arith_status: unit -> unit
        (** Print the current status of the arithmetic flags. *)

val get_error_when_null_denominator : unit -> bool
        (** See {!Arith_status.set_error_when_null_denominator}.*)
val set_error_when_null_denominator : bool -> unit
        (** Get or set the flag [null_denominator]. When on, attempting to
           create a rational with a null denominator raises an exception.
           When off, rationals with null denominators are accepted.
           Initially: on. *)

val get_normalize_ratio : unit -> bool
        (** See {!Arith_status.set_normalize_ratio}.*)
val set_normalize_ratio : bool -> unit
        (** Get or set the flag [normalize_ratio]. When on, rational
           numbers are normalized after each operation. When off,
           rational numbers are not normalized until printed.
           Initially: off. *)

val get_normalize_ratio_when_printing : unit -> bool
        (** See {!Arith_status.set_normalize_ratio_when_printing}.*)
val set_normalize_ratio_when_printing : bool -> unit
        (** Get or set the flag [normalize_ratio_when_printing].
           When on, rational numbers are normalized before being printed.
           When off, rational numbers are printed as is, without normalization.
           Initially: on. *)

val get_approx_printing : unit -> bool
        (** See {!Arith_status.set_approx_printing}.*)
val set_approx_printing : bool -> unit
        (** Get or set the flag [approx_printing].
           When on, rational numbers are printed as a decimal approximation.
           When off, rational numbers are printed as a fraction.
           Initially: off. *)

val get_floating_precision : unit -> int
        (** See {!Arith_status.set_floating_precision}.*)
val set_floating_precision : int -> unit
        (** Get or set the parameter [floating_precision].
           This parameter is the number of digits displayed when
           [approx_printing] is on.
           Initially: 12. *)