🚀 Java Console Calculator

A Java Console-based Calculator with multiple operations, error handling, and history tracking.
Perfect for learning Java basics, loops, methods, exception handling, and console input/output.

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✨ Features

Operation	Description
➕ Addition	Adds two numbers
➖ Subtraction	Subtracts second number from first
✖️ Multiplication	Multiplies two numbers
➗ Division	Divides first number by second (handles divide by zero)
% Modulus	Calculates remainder
x^y Power	Calculates first number raised to second number
√ Square Root	Calculates square root (handles negative numbers)
n! Factorial	Calculates factorial of an integer (non-negative)
📜 History	Keeps a log of all previous operations

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🖥️ How to Run

1. Clone the Repository:

    First, download the project from GitHub:
    git clone https://github.com/Sumermal/Java-Console-Calculator.git
   
    This will create a folder your-repo-name containing the project files.
   

2. Open in an IDE:

    Open IntelliJ IDEA (or any Java IDE).
   
    Choose Open → Select the project folder you cloned.
   
    Make sure ConsoleCalculator.java is inside the src/ directory.
   

3. Compile and Run:

    Run in IntelliJ :
   
    Right-click ConsoleCalculator.java → Run 'ConsoleCalculator.main()'
   
    The program will open in the console, displaying the menu.
   

4. Using the Calculator

The program will show a menu with operations:

    1. Addition (+)
    2. Subtraction (-)
    3. Multiplication (*)
    4. Division (/)
    5. Modulus (%)
    6. Power (x^y)
    7. Square Root (√x)
    8. Factorial (n!)
    9. Show History
    10. Exit


    Enter the number of the operation, then input your numbers.

    Results will display immediately.

    Option 9 shows the history of all calculations.

    Option 10 exits the calculator.

5. Notes:

    Division by zero → returns NaN.
   
   Square root of negative numbers → returns NaN.
   
    Factorial only supports non-negative integers.
   

🛠️ Tech Stack

Java 8+

Console input/output

ArrayList for history

📁 Project Structure

ConsoleCalculator/
├─ src/
│  └─ ConsoleCalculator.java
├─ .gitignore
├─ README.md

👨‍💻 Author

Lohar Sumermal
Java Developer | Backend Enthusiast