Simple RPN Calulator

This is a simple calculator for the UPN principle (Reverse Polish Notation) works. Inspired by the many products from Hewlett-Packard for this area.

Some features:

- It has all the basic arithmetic operations and can also squares and calculates root

- The stack comprises four levels and is always visible

- Automatic switching between German and English, depending on the setting of the device

- Import and export values via the clipboard

- Landscape mode

- Accuracy of ~15 digits

- Ad-free