🧭 Objective

Create a simple ATM Simulation program using JavaScript (no UI, only prompt() and alert() dialogs).

🧩 Requirements

1. Start with a Default Balance

   let balance = 1000;
   

   This represents the user’s account balance.

2. Ask for a PIN

   • Use a prompt() to ask the user for their PIN.
   • Use a variable to store the correct PIN (e.g. const correctPin = "1234";).
   • If the entered PIN is incorrect, show an alert("Incorrect PIN!") and stop the program.

3. Show the Main Menu

   Once the correct PIN is entered, display a menu using a prompt():

   let choice = prompt(
     "Welcome to JS ATM 💳\n\n" +
     "1️⃣ Check Balance\n" +
     "2️⃣ Withdraw\n" +
     "3️⃣ Deposit\n" +
     "4️⃣ Exit\n\n" +
     "Enter your choice (1-4):"
   );
   

   • Store the user’s choice in a variable.
   • Use if...else if or switch to handle each menu option.

4. Handle Each Option

   Option 1 – Check Balance

   → Show the current balance using alert("Your balance is: $" + balance);

   Option 2 – Withdraw

   → Ask how much to withdraw (prompt()),

   → If the amount is more than the balance, show alert("Insufficient funds!")

   → Otherwise, subtract it from balance and show alert("Withdrawal successful! New balance: $" + balance);

   Option 3 – Deposit

   → Ask how much to deposit (prompt()),

   → Add it to balance,

   → Show alert("Deposit successful! New balance: $" + balance);

   Option 4 – Exit

   → Show alert("Thank you for using the ATM!") and end the program.

5. Invalid Input

   → If the user enters anything other than 1–4, show alert("Invalid option!").

✅ Example Flow

Enter PIN: 1234
→ Welcome to the ATM!
   1. Check Balance
   2. Withdraw
   3. Deposit
   4. Exit

User chooses 2 → Withdraw
Enter amount: 200
→ Withdrawal successful! New balance: $800