🧮 Calculator

🧾 Project Summary

This project implements a simple calculator in Java that can parse and evaluate mathematical expressions represented as strings. It supports:

• Positive and negative numbers
• Floating-point numbers
• The four basic operations: +, -, *, /
• Parentheses with proper precedence
• Multiple unary signs (--, -+, etc.)

All required unit tests (CalculatorTest.java) are fully passing, including the bonus tests for negative numbers and parentheses.

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🧪 How to Run the Tests

This project uses JDK 17 (LTS).

🔧 Option 1: Maven

mvn clean test

🔧 Option 2: IntelliJ / Eclipse

• Make sure project SDK is set to JDK 17
• Open CalculatorTest and Run All Tests

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🚀 How to Run the Calculator

Compile the project:

javac -d out \
  src/main/java/org/isep/cleancode/Main.java \
  src/main/java/org/isep/cleancode/calculator/Calculator.java

Start the REPL:

java -cp out org.isep.cleancode.Main

Example:

> --1
= 1.0
> (1 + 2) * 3
= 9.0
> exit
Goodbye!

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🧠 Implementation Notes

• Unary operators are handled using a posi flag to manage sign logic.
• Parentheses are parsed recursively.
• The implementation avoids third-party libraries and focuses on clear, readable logic.
• Only standard Java (java.util) is used.

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🧑‍💻 Tech Stack

• Java 17
• JUnit 5
• Maven

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🏆 Bonus Achievements

• ✅ Negative numbers supported
• ✅ Parentheses supported
• ✅ Public GitHub repo (if you share the link in your email)