This C++ console application simulates basic ATM (Automated Teller Machine) operations on user accounts. It provides functionality to:

• Create new accounts with name and 10‑digit card number
• Deposit funds (adds a 1% bonus to each deposit)
• Withdraw funds (charges a 3% fee on withdrawals)
• Transfer funds between accounts (charges 1.5% fee on sender, 1.5% bonus on receiver)
• Display account information

The program maintains up to 100 accounts in memory, each with a name, card number, and balance.

• User Input Validation:

  • Names: Only letters and spaces, length between 3 and 100.
  • Card Numbers: Exactly 10 digits, not all identical.
  • Monetary Values: Numeric input (floats) only.

• Fees & Bonuses:

  • Deposits: +1% on deposited amount.
  • Withdrawals: 3% fee.
  • Transfers: 1.5% fee on sender, 1.5% bonus to receiver.

• Error Handling:

  • Re-prompts up to 2–3 attempts for invalid account numbers or operations.
  • Prevents operations when funds are insufficient.

• Menu‑Driven Interface:

  • Presents a 5‑option main menu: Create, Deposit, Transfer, Withdrawal, Exit.

• class ATM: Encapsulates account data (acc_name, card_no, amount) and member functions:

  • create_new_acc(...)
  • deposit(...)
  • withdrawal(...)
  • transfer(...)
  • print_acc_data()
  • get() to return the card number

• Utility Functions (global scope):

  • checkname(), checkdigit(), checksamedigit() for input validation
  • check_float(), char_to_float() to parse and validate monetary values
  • Account lookup helpers: getaccount(), sendingacc(), receivingacc()
  • display() for menu printing
  • check_operation_no() validates menu choice

• Global Variables:

  • ATM accounts[100]: Fixed-size array for account objects
  • int account_counter: Tracks number of created accounts
  • Temporary buffers for user input (acc_number, value, operation_no, name)

1. Requirements:

   • C++11 or later compiler (e.g., g++, clang++)

2. Build:

   g++ -std=c++11 -o atm_app main.cpp

   • Follow on‑screen menu prompts.
   • Enter numeric choices (1–5) to select operations.
   • Provide valid account/name/value inputs when prompted.