Smart Calculator (Kotlin)

A robust, arbitrary-precision command-line calculator built using modern compiler-design principles.

This application was developed as a milestone project within the Hyperskill / JetBrains Academy Kotlin Core curriculum.

• Course Project Page: https://hyperskill.org/projects/88
• My Hyperskill Profile: https://hyperskill.org/profile/629496713

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Key Features

• Lexical Analysis: Built a custom stateful Tokenizer utilizing regular expressions to cleanly parse raw infix mathematical strings.
• Type-Safe Domain Modeling: Leveraged Kotlin sealed class architectures and data objects to represent tokens and exceptions safely at compile-time.
• Shunting-Yard Algorithm: Implemented Dijkstra's Shunting-Yard algorithm using an ArrayDeque stack to seamlessly convert Infix expressions to Postfix (RPN) notation.
• Arbitrary Precision: Built completely atop Java's BigInteger to support infinitely large numbers and prevent overflow runtime bugs.
• Smart Sign Resolution: Dynamically processes and normalizes complex chains of unary operators (e.g., resolving -5 + (---3 * 2) accurately).

Tech Stack

• Kotlin (JVM)
• Java Math API (BigInteger)

How to Run

1. Open the project root folder in IntelliJ IDEA.
2. Run the main() function inside Calculator.kt.
3. Type in /help for instructions.