This is a project that demonstrates how to create a tree-walker interpreter. It now can only evaluate simple expressions including add, subtract, division, exponent and unary.

1. Clones this repository:

$ git clone https://github.com/TheEEs/expression_repl.git

2. Navigates into the cloned directory then run:

crystal run -Drepl ./src/repl.cr

1. Evalutes single expression.

1 * (6   10 / 2)

2. Evalutes multiple expression.

1 * (6   10 / 2); 8 ** 3

3. Types exit to terminate the program