Usually when we write mathematical expression in school, we write them in an infix manner.

For instance, we write 10 - (4 + 3) * 2.

It would be 10 4 3 + 2 * - in Reverse Polish Notation.

Initially it looks a bit weird, but it's actually pretty easy to understand and use because there's no need for parentheses and it's very easy to punch into a calculator.

While most modern calculators use infix notation, some people still swear by RPN calculators.

This is for them.

I hope you enjoy this app.