This terminal app runs on PCs or laptops running OSX or GNU/Linux. It attempts to mimic the functionality of an HP ReversePolishNotation [RPN] calculator with the added enhancement of interval output. So along with your answer, you get a good idea of its trustworthiness.
This app uses GAOL, a C++ library to perform arithmetic with floating-point intervals.
The Finanx 12c is a free software that mimics the HP-12C financial calculator.
This software was developed for educational purposes. IT'S NOT RECOMMENDED using this
calculator for professional calculations.
If you find any bugs, please, let me know. Click "Bugs" in the menu bar to report bugs found.