KOOL

class Object {
  var nothing;
  method init() { nothing = null; }
}

class Account extends Object {
  var balance;
  method init(b) { balance = b; }
  method deposit(amount) { balance = balance + amount; }
  method withdraw(amount) {
    if (balance >= amount) {
      balance = balance - amount;
      return true;
    }
    return false;
  }
  method getBalance() { return balance; }
}

var a;
a = new Account(100);
a.deposit(200);
a.withdraw(150);
print(a.getBalance());