Upgrading from:

NumericalMath`ComputerArithmetic`

All the functionality of NumericalMath`ComputerArithmetic` is now available in the newly created Computer Arithmetic Package.

To access functionality from the new Computer Arithmetic Package, load ComputerArithmetic`:

Version 5.2 << NumericalMath`ComputerArithmetic`;
ComputerNumber[4]
Computer Arithmetic Package

Many functions from NumericalMath`ComputerArithmetic` are now found in the Computer Arithmetic Package:

Arithmetic ComputerNumber ExponentRange IdealDivide MixedMode NaN RoundingRule RoundToEven RoundToInfinity SetArithmetic Truncation