---
title: "C# Programmable Calculator"
url: "https://osherove.com/blog/2003/11/6/c-programmable-calculator.md"
canonical: "https://osherove.com/blog/2003/11/6/c-programmable-calculator.html"
published: "2003-11-06T14:51:00"
updated: "2003-11-06T14:51:00"
tags: ["Cool Tools"]
author: "Roy Osherove"
description: "How cool is a calculator that you can actually program what each button does using C#? Look for yourself: “ C# Programmable Calculator is a Reverse Polish Notation (RPN) calculator with custom buttons programmable in…"
usage: "Licensed under CC BY 4.0 — reuse, quote and adapt with attribution (Roy Osherove, link to the original page)."
license: "https://creativecommons.org/licenses/by/4.0/"
---

# C\# Programmable Calculator

By Roy Osherove November 6, 2003 In [Cool Tools](https://osherove.com/blog/category/cool-tools)

**Historical article** · Originally published November 6, 2003; technical details may be outdated.

How cool is a calculator that you can actually program what each button does using C#? Look for yourself:

“[C# Programmable Calculator](http://www.personalmicrocosms.com/html/cspcalc.html) is a Reverse Polish Notation (RPN) calculator with custom buttons programmable in C#.“

Its shareware, but the unregistered version still gives you 20 programmable buttons. I'll never need more than that :)

## More in Cool Tools

[All posts in Cool Tools](https://osherove.com/blog/category/cool-tools)

- Nov 11, 2003

    ### [\[Document\] Port Requirements for Microsoft Windows Server System](https://osherove.com/blog/2003/11/11/document-port-requirements-for-microsoft-windows-server-syst.html)

- Nov 9, 2003

    ### [\[Tool\] - cool (free) news reader](https://osherove.com/blog/2003/11/9/tool-cool-free-news-reader.html)

- Nov 5, 2003

    ### [\[Tool\] The Regulator 1.02a is out](https://osherove.com/blog/2003/11/5/tool-the-regulator-102a-is-out.html)

- Oct 27, 2003

    ### [Regulator Coming along nicely](https://osherove.com/blog/2003/10/27/regulator-coming-along-nicely.html)


---

## About the author

**Roy Osherove**: Senior Solutions Architect at AWS working on AI for production and AI-driven development; author of The Art of Unit Testing and Elastic Leadership, with about 20 years of consulting and training on unit testing, TDD, team leadership and continuous delivery.

### Sites

- [RobotPaper](https://robotpaper.ai/): This blog: AI patterns and anti-patterns, AI and coding agents, and engineering leadership.
- [osherove.com](https://osherove.com): Roy's personal site. Author of The Art of Unit Testing and Elastic Leadership; consulting and training on unit testing, TDD, team leadership and continuous delivery, plus about 20 years of blog posts.
- [The Art of Unit Testing](https://www.artofunittesting.com): The Art of Unit Testing, 3rd Edition (Manning): readable, maintainable, trustworthy unit tests, plus TDD workshops in C#, JavaScript, Java and Kotlin.
- [5whys.com](https://www.5whys.com): Roy's writing on software team leadership: self-organizing teams, surviving chaos, learning mode and the Elastic Leadership model.
- [Pipeline Driven](https://pipelinedriven.org): Continuous delivery and DevOps practices: build patterns, pipeline-friendly testing, DevOps metrics and enterprise DevOps.
- [Elastic Leadership](https://www.elasticleadership.com): Elastic Leadership, Roy's framework for software team leaders (survival, learning and self-organizing modes).

### Social

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### Contact

- Contact form: https://forms.gle/jQSx5KoXvrVA1JCK7

### License

Licensed under CC BY 4.0 — reuse, quote and adapt with attribution (Roy Osherove, link to the original page). License: https://creativecommons.org/licenses/by/4.0/