calculator

This is a project to be done for one of the Houston Clojure group meetings.

Build a function calculate that parses and evaluates a string.

Keeping track of the input string and the operator stack might be just stateful enough to be problematic.

Some ideas:

• Write a java library to solve the problem and bind it to clojure
• Write a parser to translate the input into clojure and eval it
• Inject an infix macro around the input and eval it
• Use mutable state in clojure (var/ref/atom/agent)
• Track state as function params
• Applicative Functors/Monads for parsing and state management

Usage

A basic structure and test file is provided. It can be run using lein test. I assume cake should work similarly.