📒 Address Book Management System in C

A robust and modular command-line Address Book application developed in C programming language. It allows users to efficiently manage contacts with features such as add, search, edit, delete, and persistent storage using CSV files. Designed with a real-world contact manager in mind, the system emphasizes clean user interaction, strong input validation, and file-based data management.

🧾 Project Description

Managing contacts manually or through outdated tools can be inefficient. This project offers a lightweight terminal-based alternative that supports all core contact operations with a focus on simplicity, data accuracy, and long-term usability.

The application follows a modular architecture with reusable components, input validations, and CSV-based file I/O that simulates real-world applications. Suitable for beginners learning file handling, structs, and modular C programming.

📌 Key Features

• ✅ Add New Contact with validation
• 🔍 Search by Name / Email / Phone (case-insensitive & partial match)
• 📝 Edit existing contact details
• 🗑️ Delete contacts with confirmation
• 📋 View all saved contacts in tabular format
• 📂 Save and Load contacts from a .csv file
• 🔐 Validates Name, Email, Phone with custom rules
• 🆘 Emergency contacts support (Ambulance, Police, etc.)
• ❌ Prevents duplicate contact entries (by phone/email)
• 🧼 Clean, modular codebase — easy to maintain and extend

• 📂 Project Structure

• AddressBook/

├── a.out # Compiled executable (generated after build)

├── main.c # Program entry point & menu handling

├── contact.c # Functions for adding, editing, deleting contacts

├── contact.h # Header file for contact-related declarations

├── file.c # Functions for saving/loading contacts from CSV

├── file.h # Header file for file operations

├── contacts.csv # Persistent contact data stored in CSV format

└── README.md # Project documentation (you’re reading it!)

🔐 Input Validation

• Name: Alphabet-only (no digits/symbols)
  • Example: Anju
• Phone: Exactly 10 digits, numeric only
  • Example: 9876543210
• Email: One @, valid domain ending with .com
  • Example: anju.k@domain.com

Invalid entries are rejected with clear error messages to ensure data integrity.

🎬 Screenshots / Demo

🧠 How It Works

1. Launch the Program – Menu-driven interface appears.
2. Choose an Option – Add, Edit, Search, Delete, List, Emergency.
3. Data is Validated – Ensures all inputs are in proper format.
4. Persistent Save – All contacts are saved in contacts.csv.
5. Load Existing Data – Program auto-loads contacts from file.

📈 Future Enhancements

🌐 GUI using GTK or ncurses

🗄️ Switch to SQLite / MySQL backend

🔐 Password-protected user login

🧾 Export to Excel or JSON

🌍 Multilingual UI support

⏱️ Track creation & update timestamps

🖥️ How to Compile & Run

gcc *.c -o hotel_management
./hotel_management
👨‍💻 Developed By
Vedha C R
💻 C Programmer | Project Enthusiast
📫 Email: vedhagowda59@gmail.com
🌐 🖥️ GitHub: https://github.com/VedhaCR59
🔗 LinkedIn: https://www.linkedin.com/in/vedhacr

## 📄 License

This project is licensed under the **MIT License**.  
Feel free to **fork**, **contribute**, or **use it** in your own projects!