The last few times I wanted to learn a new language/platform that involved a user interface I have written an RPN calculator. I just did this over the weekend t

The last few times I wanted to learn a new language/platform that involved a user interface I have written an RPN calculator. I just did this over the weekend to learn iOS and Objective-C. Making a calculator forces one to learn how to work with the user interface framework. Making a sophisticated calculator forces one to learn more about the language and the math libraries available.