RPNCalcN

RPNCalcN is a Reverse Polish Notation calculator for Software Engineering.

Designed to replace all calculators I have owned and all the calculators I have written in C, Perl and other languages for my desktop, RPNCalcN strives to provide the core functionality needed in day-to-day work as a computer programmer, in a form factor suitable for a phone, so it is always available.

Features include:
* RPN with a 10 level stack
* Undo with 20 levels
* Decimal floating point, fixed and scientific notation
* Hexadecimal entry, display, arithmetic and logic calculation
* Trig functions
* Fraction display
* Prime Factorization display
* Time and Date arithmetic and display

RPNCalcN is not programmable. There are better outlets for programming now than calculators. The Android platform is more than friendly enough.

RPNCalcN is not a clone of any existing calculator. Prized by engineers, Hewlett-Packard crafted many fine hand-held calculators with high aesthetics and solid mechanical design. Outside of engineering, HP was relatively unknown, thanks to their unorthodox choice of Reverse Polish Notation instead of the more familiar algebra-like variants used by everyone else. In the 1980s RPN finally reached the main stream with the explosion of popularity of HP-12C aimed at financial professionals. Most RPN calculators found on Google Play are 10 series look-alikes. RPNCalcN makes no effort to act or look like any of these.

RPNCalcN uses American Mathematical Society AMS-LaTeX renderings for all buttons and icons.

Recent changes:
Bug Fixes
- Handle restorePreferences format mismatch gracefully
- Crash on not, Another crash on round
- Allow entering decimal seconds (milliseconds) in time mode
- Nan draws as 0+e (for example, -2 sqrt)
- a+b/2^c does a+b/c instead
- clean up fraction rendering engine
- 111111111-1 (11 1's) crashes a+b/2^c mode
- Undo when entering a number does not render the tos because it is behind the number
- Added alpha CAS polynomial algebra keyboard and display
- Updated help