🏦 CLI Banking Application

A comprehensive, command-line based banking application written in C++. Simulates banking operations for both administrators and customers, featuring CSV-based data persistence and external configuration. Great for learning OOP and C++ fundamentals.

✨ Key Features

🤵 Admin Functionalities

• Account Management: Create/delete customer accounts.
• Transactions: Withdraw, deposit, or transfer funds for any customer.
• Financial Oversight: Apply interest, manage loan charges, approve loans.
• Account Utilities: View detailed customer info, unlock accounts.
• Admin Password in config.txt is Admin@123.

👤 Customer Functionalities

• Secure Login: Accounts lock after multiple failed attempts.
• Core Banking: Withdraw, deposit, transfer funds.
• Account Information: View balance, loans, and pay dues.
• Security: Change account password.

🔧 General Features

• Data Persistence: All data saved to customers.csv.
• External Configuration: Global parameters via config.txt.
• Password Hashing: Secure storage of passwords.
• Admin Password Utility: Separate executable for changing admin password.

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🏛️ Project Architecture & Strengths

• Modular design: admin.h, admin.cpp, customer.h, customer.cpp, main.cpp.
• Clear class responsibilities demonstrating OOP principles.
• Password system and account lockout ensure security.
• User-friendly command-line menus with intuitive flow.

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⚠️ Note on Security & Hashing

Currently uses std::hash. Suitable for learning, not cryptographically secure.
For real-world applications, use BCrypt, Argon2, or SHA256.

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🚀 Getting Started

Main Banking Application

1. Navigate to project directory.
2. Compile:

g++ main.cpp admin.cpp customer.cpp -o bank_app.exe

3. Run:

.\bank_app.exe

OR:

make

Admin Password Change Utility

1. Navigate to project directory.
2. Compile:

g++ change_admin_password.cpp -o change_admin_password.exe

3. Run:

.\change_admin_password.exe

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⚙️ Configuration

config.txt controls global parameters:

admin_password: <hashed password> (Admin@123)
interest_rate: 0.055
loan_charge: 0.05
maintenance_charge: 50
minimum_balance: 500
minimum_balance_charge: 100

Adjust without recompiling.

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📚 Learning Outcomes

• Object-Oriented Programming (OOP) in C++
• Modular project structure (headers & implementation files)
• User input and error handling
• std::vector for dynamic storage
• File I/O with .csv and config files
• Extensible CLI system design

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📜 Project History (Changelog)

• v1.3 (28-09-2025): Password hashing & admin password change utility.
• v1.2 (27-09-2025): config.txt support for global parameters.
• v1.1 (27-09-2025): General fixes & polishing.
• v1.0 (27-09-2025): Full basic implementation.
• v0.1 (22-09-2025): Basic skeleton.

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🎯 Future Work (TODO)

• Add Passbook: Transaction history functionality.
• UI Improvements: More user-friendly CLI interface.