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rpn's Introduction

RPN

RPN is a slightly unusual four function calculator for Android. It’s designed to replace the standard built-in calculator, and features large buttons designed for easy touchscreen use.

It has three unusual features:

  • It uses Reverse Polish Notation, as commonly found on HP calculators.
  • It uses decimal arithmetic.
  • It uses fixed point.
  • It does not offer scientific functions, unit conversions, base conversions, programmability, memory registers, or any other advanced functionality, because I don’t need those things when I’m away from my desk, and I wrote the program to “scratch my itch”. If you need that stuff, there are at least half a dozen scientific calculators available for free in the Android Market, including an HP48 emulator.

If you just want to install the calculator, you can do that easily; see RPN on the Android Market.

If you want to read more about why I wrote this calculator, and why it's the way it is, my web site has details.

Source code licensed under the GNU Public License, Version 3 or later. Improvements are welcome.

Version history

2.0.2

  • Fixes visual glitches on Jelly Bean (Android 4.1) on Galaxy Nexus.

2.0.1

  • Fixes double audio feedback on keyboard buttons.
  • Improves haptic feedback to fire when the key is touched, like the regular on-screen QWERTY keyboard.

2.0

  • Now requires Android 4 -- use 1.x (commit 199a87f731) if you are stuck with an earlier OS version.
  • Completely reworked Android 4 UI, with Roboto font.
  • Now requires at least 320x480 resolution. As far as I know there aren't any Android 4 devices with a lower resolution than that; in fact, the SDK Android 4 image copes badly with a display that small.
  • Now runs in portrait only. I found that orientation changes were more annoying than anything else, and there just isn't enough space for 4 rows of usable keys, plus an action bar, plus a number display with at least two lines.
  • New square root button, as per user request.
  • Single keypad (no shift), a benefit of going portrait mode only.
  • Improved key labels for special functions.
  • High resolution icon.
  • Significant code cleanup thanks to Android 4 APIs.

rpn's People

Contributors

lpar avatar afmachado avatar

Watchers

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