Earlier this year, I released some routines for 128-bit large integers. I've since been working on actually doing something with those routines. (The division routine is still terrible.) Programmer's Calculator provides functionality useful for programmers, namely arithmetic in binary, hex, and decimal, for numbers up to 128 bits in size. The idea here is that when working on a project, you can use this as a quick desktop calculator instead of having to switch to another window.

A beta demo is available on the GitHub page. Since this is an early beta, the UI is pretty basic. It's an RPN (Reverse Polish Notation) system, with the idea being that it's easier to make a UI that handles RPN than a UI that handles traditional algebraic input style.

Planned features include octal, a proper UI for selecting settings, more UI decoration so you can actually tell what you're looking at, more arithmetic and logic functions, scrolling for the stack, other stack manipulation functions, and a cache of the previous stack from the last time you ran the program.
If you haven't been following the GitHub repo (and I know you haven't), you might have gotten the impression this project is dead. It is not. I've released a new beta that's fully functional, though a bit unintuitive. Nevertheless, you can do arithmetic and convert bases readily. The RPN stack may take some getting used to, but it made the UI a lot easier to implement.

For the approximately none of you who were waiting for me to finish this project, please enjoy version 1.0. It has a very sophisticated widget subsystem that implements the settings dialog (and some other dialogs). It's even got support for modal dialogs. Since I transformed the entire user interface system into an event-driven system, main() is now very short. There's also a manual with a full list of what keys do.

Looking great DrDnar!

I like the idea of an event driven ui, very slick Smile
I've added some minor improvements to the program: your stack can now be saved and restored when you quit and resume the program, and leading zeros are now grayed out for improved readability.

What I really want to know is if people will keep their calculator on their desk when programming so they always have a programmer's calculator handy. I wrote this because I wanted such a thing.
This looks really nice! If I actually used my calculator any more, I'd probably use this instead of the Windows calculator in programming mode, which is good but not great.

Your post about graying out leading zeros got me thinking: what about leading F's (hexadecimal) for "negative" numbers? Maybe that's a little silly, but perhaps less silly is allowing display bases to be specified as signed, so small negative values would still show up with leading zeros that can nicely be grayed out.
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