Open Source C RPN Calculators

This project has created scientific firmware for the HP-20b and HP-30b business calculators. WP 34S turns either of these calculators into a powerful keystroke programmable scientific device. According to our customers, it's the most powerful and fastest RPN scientific pocket calculator ever built. WP 34S is alive and stable since 2011. We have succeeded in satisfying the most picky users - read about their experiences on http://www.hpmuseum.org/forum/forum-8.html. Since 2014, WP 34S runs in version 3.3. Our customers confirm its documentation is excellent and comprehensive (see feedback); a full-color printed edition is available from https://www.amazon.com/dp/153366238X since 2018-10-15. Alternatively, you can get a personalized pdf-manual for a ≥ 9 US$ donation here. We have also produced the WP 31S which is derived from the WP 34S source code. This is an entry-level scientific calculator. Its printed manual is available from https://www.amazon.com/dp/1499231164 .

4tH is a Forth compiler with a little difference. Instead of the standard Forth engine it features a conventional compiler. 4tH is a very small compiler that can create bytecode, C-embeddable bytecode, standalone executables, but also works fine as a scripting language. It supports about 95% of the ANS Forth CORE wordset and features conditional compilation, pipes, files, assertions, forward declarations, enumerations, structures, suspended execution, recursion, include files, etc. It comes with an RPN calculator, BASIC interpreter, line editor, preprocessor, compiler, decompiler, C-source generator, a virtual machine, and a multitasking environment.

galculator is a GTK 2 / GTK 3 based scientific calculator supporting algebraic mode as well as RPN. Features include arithmetic precedence handling, mathematical functions, different number bases (DEC, HEX, BIN, OCT) and angle bases (radiant, degree, and grad). Please note: This project page at sf.net reflects the state of the project up to August 2015. Beginning in September 2015, the project homepage was moved to http://galculator.mnim.org, with the source code repositories and issue trackers hosted at https://github.com/galculator/galculator.

OpenDRO is an open source project to develop embedded software that runs on digital readouts (DROs) for lathes, mills, and other machine tools.

An RPN calculator design to manage well with stdin stream of number and operations

"Caltos" ( french slang word for calculator ) is a command-line RPN ( reverse polish notation ) calculator, using ncurses.

Calx is a calculator program based on RPN (Reverse-Polish Notation) that allows you to compute complex mathematical expressions containing brackets, mathematical functions etc.

An open source RPN calculator written in C

Suite of small web apps: calendar, address book, RPN calculator, DVD title database, password wallet and a page for generally useful information. Includes a program to send email reminders of calendar events.

Polishcalc is a simple RPN calculator. It is very small and useful.

A programmable RPN calculator for various PDAs. It features a programming language that resembles the original RPL found in HP48, along with other \"standard\" features such as matrices, complex numbers, binary arithmetic etc.

GTK based RPN calculator for Linux/Unix. Currently under development, but supports Real Numbers, Complex Numbers, Matrices, and Vectors

GRPN is a graphical reverse polish notation (RPN) calculator. GRPN is written in C and uses the GIMP Toolkit (GTK) for the GUI.

The ultimative shared library to do calculations(!) and conversions with any units! Includes all SI and pseudo SI units and thousands of US, Imperial and other units. 10th of thousands of typical dimensions are recognised as well. An easy API for calculations is available as well as a ncurses based calculator providing RPN and algebraic mode.

Small RPN (HP48 style) calculator, working in text mode, in interactive way (with GNU Readline) or automic way (from a pipe)