A simple arithmetic evaluator. Enter a sum like 3+4 and Scratch cat will tell you the answer. This project supports numbers, +, -, *, /, (, ), ^, sqrt, sin, cos & log and I've added support for two parameters (arguments, like a, b, x, y, n or cheese). This could be extended to draw graphs? :) And add more mathematical operators.
There are two stages to this project. The first stage converts the mathematical string into reverse polish notation. The second stage then evaluates the reverse polish notation to find the answer... Thanks to @DadOfMrLog for the ^ scripts :) This project came about because of a request by @ShieldOS
