Smart Calculator + Expense Tracker (CLI)

A console-based Java application that combines a smart calculator with an expense tracking system. This project demonstrates the use of Java fundamentals like file handling, collections, and modular programming in a practical real-world utility application.

Features:

Calculator Functions

• Addition
• Subtraction
• Multiplication
• Division

Scientific calculations:

• sin()
• cos()
• tan()

Conversions:

• Polar To Rectangular
• Rectangular To Polar

Expense Tracker:

• Add expenses with categories
• Track spending history
• Store records using file handling
• View total spending by category
• Clear expense history

Data Management:

• Persistent history storage
• File-based record management
• Category-wise expense summary using HashMap

Tech Stack:

• Java
• File Handling
• HashMap
• CLI (Console-Based Interface)

Project Structure:

Calculator.java
history.txt
expenses.txt

How to Run:

1. Clone the Repository git clone
2. Navigate to Project Folder cd smart-calculator-expense-tracker
3. Compile the Program javac Calculator.java
4. Run the Application java Calculator

Future Improvements:

• GUI version using Java Swing / JavaFX
• Database integration (MySQL/SQLite)
• Expense analysis charts
• Export reports as PDF/CSV
• Authentication system

Contributing:

Contributions and suggestions are welcome.

1. Fork the repository
2. Create a new branch
3. Commit your changes
4. Open a Pull Request