Battery-operated calculator based on the operation of HP graphic calculators, optimised for use via mobile touch screens. Although calculators are commonly used to learn new APIs of applications with interfaces, the use of a battery-operated calculator involves greater internal complexity than the simple calculator used in most basic applications.
You can download from google play in the next link:
[app]
store=google;
id=es.jaumesingla.StackCalculator
store_name=Google Play;
store_url=https://play.google.com/store/apps/details?id=es.jaumesingla.StackCalculator;
icon=https://lh5.ggpht.com/I9IjbmQDxwcLDuWkr39oOpi_nFttpwgHC97Yb5geyB4PMPLn_Nc9rrS24kmSb-VGmQ=w300-rw;
title=StackCalculator;
company=Jaume Singla Valls;
company_url=https://play.google.com/store/apps/developer?id=Jaume+Singla+Valls;
formatted_price=Free;
[/app]