A calculator for simple arithmetic expressions, written in Kotlin. It only supports the basic four operations, parentheses, and decimal numbers; in particular, no unary operators are available.
The project is heavily inspired by the book Crafting Interpreters and its techniques on scanning, parsing, and processing expressions by the use of the Visitor pattern.
The main evaluator is based on BigDecimal, in order to avoid pitfalls in floating point operations, such as:
> 0.1 + 0.2
0.30000000000000004
Proper error management (for invalid syntax and stuff like division by zero) is currently missing. Any mistake will
throw an IllegalArgumentException and crash the program.