Elixulator

Description:

This is a simple calculator I wrote in Elixir for Web Development - CS4550.
I implemented a lexer, parser, and interpreter for the calculations. I parsed the information into Reverse Polish Notation with the Shunting-Yard Algorithm and evaluated it with a simple stack interpreter in order to guaruntee order of operations.
It supports parentheses, floating-point operations, integer operations, and has four functions (+, -, *, /):

References:

Reverse Polish Notation - https://en.wikipedia.org/wiki/Reverse_Polish_notation
Shunting-Yard Algorithm - https://en.wikipedia.org/wiki/Shunting-yard_algorithm

Assignment:

Write a four function calculator in Elixir.

Start by creating an Elixir project called "calc" with:

$ mix new calc

Your program should consist of a Calc module (lib/calc.ex) with at least two functions:

• Calc.eval (String -> Number) # Should parse and evaulate an arithmetic expression.
• Calc.main # Should repeatedly print a prompt, read one line, eval it, and print the result.

In addition, you should write tests for the public functions in your calc module (test/calc_test.exs), which should pass when you type "mix test".

Sample session:

calc$ mix run -e Calc.main
> 2 + 3
5
> 5 * 1
5
> 20 / 4
5
> 24 / 6 + (5 - 4)
5
> 1 + 3 * 3 + 1
11
> ^C^C

To Submit

• Push your calculator to github.
• Submit a filled in hw04-status.txt