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"