ATM System – Console Application (C++)

An educational console-based ATM simulation built early in my C++ learning journey.
This project focuses on implementing real ATM logic, user interaction, and basic file-based data persistence.

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🔹 Features

Authentication

• Login using account number and PIN
• Validation against stored client data

ATM Operations

• Quick Withdraw (fixed predefined amounts)
• Normal Withdraw (custom amount, multiples of 5)
• Deposit
• Balance inquiry
• Logout functionality

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🔹 ATM Rules Implemented

• Withdraw amount must not exceed account balance
• Withdraw amount must be a multiple of 5
• Quick withdraw options simulate real ATM presets
• Confirmation required before performing transactions

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🔹 Data Storage

• Client data is stored in a text file:
  • Clients.txt
• File-based storage was used intentionally for simplicity and learning purposes.

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🔹 Project Scope & Notes

• This is an educational project, not a production-ready system.
• Built to practice:
  • Functions and structures
  • File handling
  • Menu-driven programs
  • Input validation
  • State management in console applications
• Design choices prioritize clarity and learning over scalability or security.