Build a math expression evaluator

1. Tokenizer
2. Parser
3. Evaluator

1. The input is taken in as a string and the white-spaces are removed.
2. A tokenizer is instantiated that creates tokens by iterating through each character of the input.
3. An Abstract Syntax Tree is generated from the tokens.
4. Evaluation is then performed, generating a single f64 value

(5*32-2^5)*0.125  #16.0

Make sure you have rust tool-chain installed, if not go here

cargo run

And then enter the expressions you want to evaluate.

Use ctrl+c to exit the program.