Get a calulator that use Reverse Polish Notation.
Calculator.NET is an enhanced version of the standard calculator in Microsoft Windows. It uses RPN (Reverse Polish Notation), which is used by many pocket calculators, e.g. from Hewlett-Packard. If you have used a HP 11/28/32/41/42/48, or any other RPN calculator, you will feel right at home.
Solve mathematical problems as fast as possible.
Define, visualize, and calculate scientific functions.
Perform a variety of matrix related calculations.
Perform algebraic, statistical, and other functions.
Calculate deflection, slope, bending moment, shear force, and reactions of beams.
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