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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * CNRS-Ecole Polytechnique-INRIA Futurs-Universite Paris Sud *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
(*i $Id: bignat.mli,v 1.4.6.3 2005/01/21 17:14:11 herbelin Exp $ i*)
(*i*)
open Pp
(*i*)
(* Arbitrary big natural numbers *)
type bignat
val of_string : string -> bignat
val to_string : bignat -> string
val is_nonzero : bignat -> bool
val zero : bignat
val one : bignat
val is_one : bignat -> bool
val div2_with_rest : bignat -> bignat * bool (* true=odd; false=even *)
val add_1 : bignat -> bignat
val sub_1 : bignat -> bignat (* Remark: [sub_1 0]=0 *)
val mult_2 : bignat -> bignat
val less_than : bignat -> bignat -> bool
type bigint = POS of bignat | NEG of bignat
val bigint_to_string : bigint -> string
val pr_bigint : bigint -> std_ppcmds
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