Short description of LibMaster.com Extendable Calculator 1.2: Usually software calculators imitate hardware calculators. It allows Users the ability to quickly start their work with a new program. But with this approach, in regards to the design of software calculators, it inherits all of the defects of hardware calculators. The Extendable Calculator is a different way to approach calculator design. Therefore it does not contain any of the design defects, as outlined above.