# ![icon](metadata/en-US/images/icon_small.png) RPNcalc 
<a href="https://f-droid.org/packages/dev.pesic.rpncalc"><img src="https://fdroid.gitlab.io/artwork/badge/get-it-on.png" alt="Get it on F-Droid" height="75"> </a>

A simple, modern calculator that uses RPN.

[Reverse Polish Notation](https://en.wikipedia.org/wiki/Reverse_Polish_notation) is a 
system where the operators are entered _after_ the operands. 

For example, rather than 2 + 2, you would enter:
 
    2
    2
    + 

The main benefit is a faster, more accurate interface:

> Reverse Polish calculators do not need expressions to be
> parenthesized, so fewer operations need to be entered to perform typical calculations.
> Additionally, users of reverse Polish calculators made fewer mistakes than for other
> types of calculators.

(from the Wikipedia article above).

<img src="metadata/en-US/images/phoneScreenshots/1.png" alt="Screenshot 1" height="540">
<img src="metadata/en-US/images/phoneScreenshots/2.png" alt="Screenshot 2" height="540">

## Future work

- Other platforms:
    - iOS
    - desktop (linux/mac/windows)
- Scientific mode (trig functions, logarithms, etc.)
- Persistent history

![Flutter CI](https://github.com/apesic/rpncalc/workflows/Flutter%20CI/badge.svg)