Very handy calculator, in Reverse Polish Notation style. Written in Kotlin. For every day use. Large digits with only the most used operators. In addition to Kotlin we experiment here another new feature : VectorDrawable. The icons and authored with Inkscape and we converted to Android vector drawable xml format with following converter : http://a-student.github.io/SvgToVectorDrawableConverter.Web Open source avaliable in GitHub: https://github.com/scoutant/rpn