diff options
Diffstat (limited to 'theories/Numbers/Rational/BigQ/QMake_base.v')
-rw-r--r-- | theories/Numbers/Rational/BigQ/QMake_base.v | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/theories/Numbers/Rational/BigQ/QMake_base.v b/theories/Numbers/Rational/BigQ/QMake_base.v new file mode 100644 index 00000000..547e74b7 --- /dev/null +++ b/theories/Numbers/Rational/BigQ/QMake_base.v @@ -0,0 +1,34 @@ +(************************************************************************) +(* 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 *) +(************************************************************************) +(* Benjamin Gregoire, Laurent Thery, INRIA, 2007 *) +(************************************************************************) + +(* $Id: QMake_base.v 10964 2008-05-22 11:08:13Z letouzey $ *) + +(** * An implementation of rational numbers based on big integers *) + +Require Export BigN. +Require Export BigZ. + +(* Basic type for Q: a Z or a pair of a Z and an N *) + +Inductive q_type := + | Qz : BigZ.t -> q_type + | Qq : BigZ.t -> BigN.t -> q_type. + +Definition print_type x := + match x with + | Qz _ => Z + | _ => (Z*Z)%type + end. + +Definition print x := + match x return print_type x with + | Qz zx => BigZ.to_Z zx + | Qq nx dx => (BigZ.to_Z nx, BigN.to_Z dx) + end. |