SimpleBankingApp.java

// Name Shayan ADil Khan
// id :  CA/S1/9549

import java.util.Scanner;
public class SimpleBankingApp {
    private static double balance = 0.0;
    private static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        while (true) {
            System.out.println("=======================================");
            System.out.println("          Welcome to Simple Bank!      ");
            System.out.println("=======================================");
            System.out.println("1. Deposit");
            System.out.println("2. Withdraw");
            System.out.println("3. Check Balance");
            System.out.println("4. Exit");
            System.out.println("=======================================");
            System.out.print("Choose an option: ");

            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    deposit();
                    break;
                case 2:
                    withdraw();
                    break;
                case 3:
                    checkBalance();
                    break;
                case 4:
                    System.out.println("Thank you for using Simple Bank. Goodbye!");
                    scanner.close();
                    return;
                default:
                    System.out.println("Invalid choice. Please try again.");
            }
        }
    }

    private static void deposit() {
        System.out.print("Enter amount to deposit: ");
        double amount = scanner.nextDouble();
        if (amount > 0) {
            balance += amount;
            System.out.println("Deposited: $" + amount);
        } else {
            System.out.println("Invalid amount. Must be greater than zero.");
        }
    }

    private static void withdraw() {
        System.out.print("Enter amount to withdraw: ");
        double amount = scanner.nextDouble();
        if (amount > 0 && amount <= balance) {
            balance -= amount;
            System.out.println("Withdrew: $" + amount);
        } else if (amount > balance) {
            System.out.println("Insufficient balance.");
        } else {
            System.out.println("Invalid amount. Must be greater than zero.");
        }
    }

    private static void checkBalance() {
        System.out.println("Current balance: $" + balance);
    }
}