cli_calculator

A CLI calculator that parses and solves arithmetic expressions while respecting order of operations.

This is mostly a project initially intended for learning how to do basic arithmetic expression parsing. Once I finished implementing the parser in python, I wanted to use this as an exercise for learning other languages. I'm currently working on a rust port.

Possible future implementations may be in C, C++, Scala, maybe Go.

Usage

Python

• run cli_calculator in python/src
  • This should be completely self contained and does not require any dependencies.
  • Tested with python 3.10.

Rust

• run cargo run in the rust directory

All

Once you start the program, an interactive prompt will be shown that looks like this:

>

From here, you can enter any arithmetic expression such as:

• 10 + 2 * 4 - 3
• (10 + 2) * (4 - 3)
• (10*(1-3))/2

The result of each of these expressions will be given in the form: x0 = 15.0

You can also use previous results in subsequent expressions. For example if you enter 10 + 3 you will receive the result x0 = 13.0, then if you enter x0 / 2 you will receive the result x1 = 6.5.

To gracefully quit, just enter an empty expression.