🏦 Banking System (C++)

A secure, console-based banking application built with C++ as a learning project.
It demonstrates object-oriented design, password hashing, file persistence, and efficient data structures.

✨ Features

• ✅ Create new bank accounts with password
• ✅ Secure password hashing (with salt and key stretching)
• 🔄 Login with account number and password (inprocess)
• ✅ Deposit and withdraw funds
• ✅ Persistent storage (accounts saved to file)
• ✅ Fast account lookup using vector + hash map hybrid
• ✅ Password strength validation
• 🔄 Transaction history (planned)
• 🔄 GUI version with Qt (future enhancement)

🚀 How to Build and Run

Prerequisites

• C++17 compatible compiler (g++, MinGW, etc.)

Compile

Open a terminal in the project folder and run:

g++ src/*.cpp -o bin/banking.exe

or Use the provided batch file to compile and run

📁 Project Structure

BankSystem/
│
├── .gitignore
├── README.md
├── build.bat
│
├── data/
│   └── data_file.dat
│
├── images/
│   ├── CreatingNewAccount_Screen.png
│   ├── CurrentMenu_Screen.png
│   └── Logged_Screen.png
│
└── src/
    ├── BankAccount.cpp
    ├── BankAccount.h
    ├── BankDataBase.cpp
    ├── BankDataBase.h
    ├── LibFunctions.cpp
    ├── LibFunctions.h
    ├── main.cpp
    ├── PasswordManager.cpp
    └── PasswordManager.h

🧪 What I Learned

Implementing a secure password hashing algorithm with salt

Using std::vector for fast lookups (to be improved, currently on O(n)

File I/O for persistent data storage

Object-oriented design with multiple classes and namespaces

Defensive programming (input validation, error handling)

🚧 Status

This project is a work in progress. Core banking operations work, but I plan to add: Exception handling when dealing with files

Improve the menu after the user successfully loged into their account See how current menu looks

Transaction history

Account locking after failed attempts

A graphical user interface using Qt