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