A calculator having a user-accessible object stack for the uniform application of mathematical functions and logical operations to a multiplicity of object types

摘要

A calculator is defined by a user-interface centered around a last in first out stack of mathematical or logical objects, that is both visible and accessible to a user. Objects may be any of a number of different types, each type characterized by specific logical or mathematical rules. Calculator operations are provided that may be applied in a uniform manner to the objects, affecting either or both the internal composition of the objects or the external positions and number of the objects on the stack. Objects of different types are distinguished upon entry on the stack and in visible display by characteristic prefix and postfix symbols, and can be entered from a keyboard or created dynamically as the result of calculator operations.