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author | Maxime Dénès <mail@maximedenes.fr> | 2018-02-24 09:29:26 +0100 |
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committer | Maxime Dénès <mail@maximedenes.fr> | 2018-02-24 09:29:26 +0100 |
commit | 89bd76b6f6a534613b03aaa970baf513b7c9b76b (patch) | |
tree | bfba682b6121778a64fcf1f593c37e4a6674990f /theories/ZArith/BinIntDef.v | |
parent | 7895d276146496648d576914aab4aded4b4a32cd (diff) | |
parent | 63da69cff704be2da61f3cd311fa7a67dca6fc51 (diff) |
Merge PR #6599: Decimals in prelude
Diffstat (limited to 'theories/ZArith/BinIntDef.v')
-rw-r--r-- | theories/ZArith/BinIntDef.v | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/theories/ZArith/BinIntDef.v b/theories/ZArith/BinIntDef.v index 443667f48..a0393f318 100644 --- a/theories/ZArith/BinIntDef.v +++ b/theories/ZArith/BinIntDef.v @@ -299,6 +299,23 @@ Definition to_pos (z:Z) : positive := | _ => 1%positive end. +(** Conversion with a decimal representation for printing/parsing *) + +Definition of_uint (d:Decimal.uint) := of_N (Pos.of_uint d). + +Definition of_int (d:Decimal.int) := + match d with + | Decimal.Pos d => of_uint d + | Decimal.Neg d => opp (of_uint d) + end. + +Definition to_int n := + match n with + | 0 => Decimal.Pos Decimal.zero + | pos p => Decimal.Pos (Pos.to_uint p) + | neg p => Decimal.Neg (Pos.to_uint p) + end. + (** ** Iteration of a function By convention, iterating a negative number of times is identity. |