# Decimal: Decimal numbers with variable precision

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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.

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## Properties

Versions 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, 0.5.2 changelog.md base (>=4 && <5), deepseq [details] BSD-3-Clause Paul Johnson, 2013, 2018, 2021. Paul Johnson paul@cogito.org.uk Math https://github.com/PaulJohnson/Haskell-Decimal by PaulJohnson at 2021-03-14T09:41:26Z

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## Readme for Decimal-0.5.2

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# 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

or

stack test