Bank.java

import java.util.Scanner;

public class Bank {
    //Java banking program
    //declare variable
    //display menu
    //show balance
    //deposit
    //withdraw
    static Scanner scanner = new Scanner(System.in);
    public static void main(String[] args) {
        
            double balance=0;
            boolean isRunning = true;
            int choice;
            while (isRunning) {
                System.out.println("\n****************");
                System.out.println("BANKING PROGRAM");
                System.out.println("1. Show Balance");
                System.out.println("2. Deposite");
                System.out.println("3. Withdraw");
                System.out.println("4. Exit");
                System.out.println("******************\n");
                System.out.print("Enter your choice (1-4) : ");
                choice = scanner.nextInt();
                System.out.println();
                switch (choice) {
                    case 1:
                        showBalance(balance);
                        break;
                    case 2:
                        balance += deposite();
                        break;
                    case 3:
                        balance -= withdraw(balance);
                        break;
                    case 4:
                        System.out.println("Exit");
                        isRunning = false;
                        break;
                    default:
                        System.out.println("Invalid Choice!");
                        break;

                }
            }

        
    }
    static void showBalance(double balance){
        System.out.printf("Your balance is $%.2f\n",balance);
    }
    static double deposite(){
        double amount;
        System.out.print("Enter an amount to be deposited : ");
        amount = scanner.nextDouble();
        if(amount<0){
            System.out.println("Amount can't be negative.");
            return 0;
        }
        else{
            System.out.println("");
            return amount;
        }
    }
    static double withdraw(double balance){
        double amount;
        System.out.print("Enter amount to be withdrawn : ");
        amount = scanner.nextDouble();
        if(amount>balance){
            System.out.println("Insufficient Balance!");
            return 0; 
        }
        else if(amount<0){
            System.out.println("Amount can't be negative.");
            return 0;
        }
        else{
            return amount;
        }
    }
}