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]

Modules

[Index]

Data
- Data.Decimal

Downloads

Decimal-0.5.1.tar.gz [browse] (Cabal source package)
Package description (revised from the package)

Note: This package has metadata revisions in the cabal description newer than included in the tarball. To unpack the package including the revisions, use 'cabal get'.

Maintainer's Corner

Package maintainers

PaulJohnson

For package maintainers and hackage trustees

edit package information

Candidates

0.4.1, 0.5.1, 0.5.2

Versions [RSS]	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, 0.5.2
Change log	changelog.md
Dependencies	base (>=4 && <4.15), deepseq [details]
License	BSD-3-Clause
Copyright	Paul Johnson, 2013, 2018.
Author	Paul Johnson
Maintainer	paul@cogito.org.uk
Revised	Revision 2 made by Bodigrim at 2022-07-13T21:43:27Z
Category	Math
Home page	https://github.com/PaulJohnson/Haskell-Decimal
Uploaded	by PaulJohnson at 2018-01-03T15:33:05Z
Distributions	Arch:0.5.2, Debian:0.5.1, Fedora:0.5.2, LTSHaskell:0.5.2, NixOS:0.5.2, Stackage:0.5.2, openSUSE:0.5.2
Reverse Dependencies	31 direct, 17 indirect [details]
Downloads	22225 total (108 in the last 30 days)
Rating	(no votes yet) [estimated by Bayesian average]
Your Rating	λ λ λ
Status	Docs available [build log] Last success reported on 2018-01-03 [all 1 reports]

Readme for Decimal-0.5.1

[back to package description]

Haskell-Decimal

Fixed-precision decimal numbers, where the precision is carried with the numbers at run-time.

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. Addition and subtraction operators return a result with the precision of the most precise argument, so 2.3 + 5.678 = 7.978. Multiplication and division use whatever precision is necessary up to 255 decimal places.

QuickCheck Specification

Data.Decimal includes a set of QuickCheck properties which act as both tests and a formal specification. To run the tests do:

cabal configure --enable-tests cabal build cabal test

stack test