Challenge: Safe Bank Account

Lab Java Intermediate 20 points

Write a class Account with a private balance starting at 0, and methods deposit(int), withdraw(int) and getBalance(). Deposits must be positive. A withdrawal that is more than the balance must be refused.

Read a number of commands n, then n commands like deposit 500 or withdraw 200. For a refused withdrawal print Insufficient funds. At the end print Balance: <balance>.

Input

First n, then n lines: a word and a whole number.

Output

One line per refused withdrawal, then the final balance.

Example

Input

3
deposit 500
withdraw 200
withdraw 400

Output

Insufficient funds
Balance: 300

Sample input available Sample output available

Editor

Java

Hints

Make withdraw return a boolean: true if it worked, false if refused.

Compare command words with equals().

Solution explanation

Because balance is private, the only way to change it is through methods that check the amount.

Show solution

import java.util.Scanner;

class Account {
    private int balance;

    void deposit(int amount) {
        if (amount > 0) balance += amount;
    }

    boolean withdraw(int amount) {
        if (amount > balance) return false;
        balance -= amount;
        return true;
    }

    int getBalance() {
        return balance;
    }
}

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        Account acc = new Account();
        for (int i = 0; i < n; i++) {
            String cmd = sc.next();
            int amount = sc.nextInt();
            if (cmd.equals("deposit")) {
                acc.deposit(amount);
            } else if (!acc.withdraw(amount)) {
                System.out.println("Insufficient funds");
            }
        }
        System.out.println("Balance: " + acc.getBalance());
    }
}

Output

Answer