ATM simulator


#include 
using namespace std;

int main() {
    const int CORRECT_PIN = 1234;
    int enteredPin, attempts = 0;
    double balance = 1000.0;  // initial balance
    int choice;
    double amount;

    cout << "Welcome to the ATM Simulator\n";

    // PIN verification (max 3 attempts)
    while (attempts < 3) {
        cout << "Enter your 4-digit PIN: ";
        cin >> enteredPin;
        if (enteredPin == CORRECT_PIN) {
            cout << "PIN accepted.\n\n";
            break;
        } else {
            cout << "Incorrect PIN. Try again.\n";
            attempts++;
        }
    }

    if (attempts == 3) {
        cout << "Too many incorrect attempts. Card blocked.\n";
        return 0;
    }

    // ATM operations loop
    do {
        cout << "\n--- ATM Menu ---\n";
        cout << "1. Check Balance\n";
        cout << "2. Withdraw\n";
        cout << "3. Deposit\n";
        cout << "4. Exit\n";
        cout << "Choose an option: ";
        cin >> choice;

        switch (choice) {
            case 1:
                cout << "Your current balance is: $" << balance << "\n";
                break;
            case 2:
                cout << "Enter amount to withdraw: $";
                cin >> amount;
                if (amount <= 0) {
                    cout << "Invalid amount.\n";
                } else if (amount > balance) {
                    cout << "Insufficient funds.\n";
                } else {
                    balance -= amount;
                    cout << "Withdrawal successful. New balance: $" << balance << "\n";
                }
                break;
            case 3:
                cout << "Enter amount to deposit: $";
                cin >> amount;
                if (amount <= 0) {
                    cout << "Invalid amount.\n";
                } else {
                    balance += amount;
                    cout << "Deposit successful. New balance: $" << balance << "\n";
                }
                break;
            case 4:
                cout << "Thank you for using the ATM. Goodbye!\n";
                break;
            default:
                cout << "Invalid choice. Please try again.\n";
        }
    } while (choice != 4);

    return 0;
}


Welcome to the ATM Simulator
Enter your 4-digit PIN: 1234
PIN accepted.

--- ATM Menu ---
1. Check Balance
2. Withdraw
3. Deposit
4. Exit
Choose an option: 1
Your current balance is: $1000

--- ATM Menu ---
1. Check Balance
2. Withdraw
3. Deposit
4. Exit
Choose an option: 2
Enter amount to withdraw: $500
Withdrawal successful. New balance: $500

--- ATM Menu ---
1. Check Balance
2. Withdraw
3. Deposit
4. Exit
Choose an option: 4
Thank you for using the ATM. Goodbye!