package coq

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package coq
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Numbers in different forms: signed or unsigned, possibly with fractional part and exponent.

Numbers are represented using raw strings of (hexa)decimal literals and a separate sign flag.

Note that this representation is not unique, due to possible multiple leading or trailing zeros, and -0 = +0, for instances. The reason to keep the number exactly as it was parsed is that specific notations can be declared for specific numbers (e.g. Notation "0" := False, or Notation "00" := (nil,nil), or Notation "2e1" := ...). Those notations override the generic interpretation as number. So, one has to record the form of the number which exactly matches the notation.

type sign =
  1. | SPlus
  2. | SMinus
type num_class =
  1. | CDec
  2. | CHex
type 'a exp =
  1. | EDec of 'a
  2. | EBin of 'a
String representation of a natural number
module UnsignedNat : sig ... end
String representation of a signed natural number
module SignedNat : sig ... end
Unsigned decimal numbers
module Unsigned : sig ... end
Signed decimal numbers
module Signed : sig ... end
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