🏦 C++ OOP-Based Banking System

A console-based banking simulator built to showcase modern C++ proficiency, including OOP design, STL usage, file handling, templates, and more.

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Table of Contents

• Project Overview
• Background & Objective
• Features
• Sample Data
• How It Works
• Typical Output
• Challenges & Solutions
• Technical Design & Language Proficiency
• Usage
• Future Work
• Conclusion

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Project Overview

This project is a demonstration of C++ and OOP skills, simulating a banking system with account management, transactions, and persistent storage. It uses real-world inspired data and modular code structure.

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Background & Objective

To bridge theory and practice in C++, I built a banking system that manages user accounts, supports deposits/withdrawals, and logs transactions. The project demonstrates file I/O, STL containers, error handling, and OOP design patterns.

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Features

• Loads and saves account data from CSV files
• Unique Account ID generation (static members)
• STL usage: map, set, vector
• Template functions for utility
• Multiple source/header files (modular design)
• Simple file-based transaction logging
• Unit testing with assert
• Makefile for compilation
• Const correctness and encapsulation

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Sample Data

users.csv

account_id,username,email,balance,account_type
1000,JohnDoe,john@example.com,1000.00,Savings
1001,MithraDevi,mithra@example.com,5000.75,Current

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How It Works

1. Build the Project:

   g++ src/main.cpp src/BankAccount.cpp src/BankSystem.cpp -o bank_app

2. Run the Program:

   ./bank_app

3. Follow the menu to display accounts, deposit, withdraw, and exit.

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Typical Output

1. Display All Accounts
2. Deposit
3. Withdraw
4. Exit
Choice: 1
[Account List]
ID: 1000 | Holder: JohnDoe | Balance: $1000.00 | Type: Savings
ID: 1001 | Holder: MithraDevi | Balance: $5000.75 | Type: Current
...

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Challenges & Solutions

• File I/O robustness: Ensured correct parsing and updating of CSV files.
• Account uniqueness: Used static members for unique IDs.
• Error handling: Managed invalid input and insufficient funds gracefully.
• Modularity: Split code into headers and implementations for maintainability.

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Technical Design & Language Proficiency

• Encapsulation and modularity: Private members, public accessors, separate files.
• Inheritance & polymorphism: Extendable for Savings/Current accounts.
• STL containers: Efficient account and transaction management.
• Templates: Utility functions for comparisons.
• Unit testing: Assert-based tests for reliability.
• Build automation: Makefile for easy compilation.

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Usage

1. Build:

   g++ src/main.cpp src/BankAccount.cpp src/BankSystem.cpp -o bank_app

2. Run:

   ./bank_app

3. Interact with the menu for banking operations.

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Future Work

• Add login/authentication system
• Introduce interest rate simulation (SavingsAccount)
• File-based persistent storage for transactions
• Export reports in CSV format

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Conclusion

This Banking System project demonstrates my skills in C++ and object-oriented programming. It simulates real-world banking operations with robust logic and modular design. Suggestions and contributions are welcome!

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This Banking System project demonstrates my skills in C++ and object-oriented programming. It simulates real-world banking operations with robust logic and modular design. Suggestions and contributions are welcome!

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