Decimal: Decimal numbers with variable precision

[ bsd3, library, math ] [ Propose Tags ]

A decimal number has an integer mantissa and a negative exponent. The exponent can be interpreted as the number of decimal places in the value.

[Skip to Readme]

Versions [faq]	0.1.0, 0.2.0, 0.2.1, 0.2.2, 0.2.3, 0.3.1, 0.4.1, 0.4.2, 0.5.1
Dependencies	base (==4.*), QuickCheck (>=2.4) [details]
License	BSD-3-Clause
Copyright	Paul Johnson, 2011
Author	Paul Johnson
Maintainer	paul@cogito.org.uk
Category	Math
Uploaded	by PaulJohnson at Fri Jan 20 07:42:37 UTC 2012
Distributions	Arch:0.5.1, Debian:0.5.1, Fedora:0.5.1, LTSHaskell:0.5.1, NixOS:0.5.1, Stackage:0.5.1
Downloads	9042 total (231 in the last 30 days)
Rating	(no votes yet) [estimated by rule of succession]
Your Rating	λ λ λ
Status	Docs uploaded by user Build status unknown [no reports yet]

Modules

[Index]

Data
- Data.Decimal

Downloads

Decimal-0.2.2.tar.gz [browse] (Cabal source package)
Package description (as included in the package)

Maintainer's Corner

For package maintainers and hackage trustees

edit package information

Readme for Decimal-0.2.2

[back to package description]

Variable Precision Decimal Numbers
==================================

The "Decimal" type is mainly intended for doing financial arithmetic
where the number of decimal places may not be known at compile time
(e.g. for a program that handles both Yen and Dollars) and the
application must not drop pennies on the floor.  For instance if you
have to divide $10 between three people then one of them has to get
$3.34.

The number of decimal places in a value is represented as a Word8,
allowing for up to 255 decimal places.  Functions preserve precision.
Binary operators return a result with the precision of the most
precise argument, so 2.3 + 5.678 = 7.978.

If you need fixed precision decimal arithmetic where the precision is
known at compile time then Data.Number.Fixed from Lennart Augustsson's
"numbers" package is more likely to be what you want.

QuickCheck Specification
------------------------

Data.Decimal includes a set of QuickCheck properties which act as both
tests and a formal specification (hence their inclusion in the Haddock
documentation).  To run the tests do:

   cabal configure --enable-tests
   cabal build
   cabal test

Data.Decimal is an instance of Arbitrary, for your convenience in
writing your own tests.


Version 0.2.1
-------------

Fixed "base" dependency.
Put test suite under "cabal test"

Version 0.2.2
-------------

Minor fixes to allow compilation under other versions of GHC.