The Simple ATM Interface is a beginner-friendly C++ project that simulates basic ATM operations in a console-based environment. This program is designed to demonstrate fundamental programming concepts such as loops, conditional statements, input validation, and formatted output.

A console-based ATM Interface built in C++.
It simulates basic banking operations such as checking balance, depositing funds, and withdrawing money.
Includes PIN authentication for secure access with a limit of three wrong attempts.

• 🔐 PIN Login with limited attempts
• 💰 Check Balance with currency formatting
• ➕ Deposit Money with validation for positive amounts
• ➖ Withdraw Money with overdraft protection
• 🔄 Looped menu until the user exits

1. Run the program in your console.
2. Enter the 4-digit PIN to access the ATM. (Default: 1234)
3. Select from the menu:
   • 1 – Check Balance
   • 2 – Deposit Money
   • 3 – Withdraw Money
   • 4 – Exit
4. Program ends after:
   • Selecting Exit
   • OR 3 incorrect PIN attempts

• Change PIN – Modify const int PIN in the code.
• Set Initial Balance – Adjust double balance in the code.
• Enhance Security – Mask PIN entry or encrypt stored PIN.
• Add Features – Transaction history, multiple accounts, or file storage.

Linux/macOS

g++ atm.cpp -o atm
./atm

Windows

g++ atm.cpp -o atm.exe
atm.exe