Simple Calculator

A simple four function calculator. Press an operation button and the display zeros. The value is stored. Press = to get a result. There is a C (clear) key. This calculator does not do a divide by zero check. If you try to divide by zero the result is “inf”.
I tried to design this using MVC - Model, View, Controller ideas.
http://pastebin.com/y8MJjYrr

@Brucewe there’s no need to start a separate discussion for each mini tutorial, it just clutters the forum. Please either add new items to an existing thread, or start a blog that people can follow if they want to.

Sorry, I did not intend to clutter things.

that’s ok, I didn’t mean to dampen your enthusiasm - we can always do with more tutorials!