This is the code kata from the 45th meeting of the London Code Dojo.
This is an original kata, though I'm sure not an original idea. The aim is to create a simple commmand line app that will calculate simple sums. It should support the four operations of basic arithmetic: addition, subtraction, multiplication and division. The only unusual requirement is that it should work with Polish Notation otherwise known as Normal Polish Notation (NPN) or prefix notation - invented by the Polish logician Jan Łukasiewicz in 1924.
You can find out more about the London Code Dojo at our homepage.
When you've finished with this please move onto the second part, described here.
The code samples are licensed under the CC-SA-NC-4.0 license, as shown in the LICENSE file.