view lab0/tree.mli @ 0:bfdcc3820b32

Basis
author Mike Spivey <mike@cs.ox.ac.uk>
date Thu, 05 Oct 2017 08:04:15 +0100
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(* lab1/tree.mli *)
(* Copyright (c) 2017 J. M. Spivey *)

(* Abstract syntax *)

type expr =
    Number of float             (* Constant (value) *)
  | Variable of string          (* Variable (name) *)
  | Binop of op * expr * expr   (* Binary operator *)

and op = Plus | Minus | Times | Divide