CSCI 51, Spring 2009

Create a class called DecimalToBinary.  This class for example might contain only the main
method that was the problem on page 5 of the midterm, but  I'm looking for better abstraction.
Start by making the main method only ask for an input number, negative to quit. As long the
user continues to enter in non-negative numbers, the main method should call on the convert
method, which takes an integer and returns a String that is the 12 bit binary representation of
the entered integer.  The convert method in turn calls on the pow method to compute powers
of 2.  The pow method takes two integers a and b and returns the integer a ^ b.

Create a class called BankAccount.  Have the data members of the BankAccount be a String
representing an account name and a double representing an account balance. Have the
constructor method take a String and double accordingly.  The class should also implement
the methods:
    equals(BankAccount other) that returns true if this bank account and the other are the same.
    getAccount() that returns the bank account name of this account.
    getBalance() that returns the balance.
    deposit(double amount) that adds amount to the account balance.
    withdraw(double amount) that subtracts the amount from the account balance.
    toString() that returns a String that represents the account.
Remember to check for impossible activities, such as depositing a negative amount or
withdrawing from an account with a negative balance.

I will test your BankAccount class with a BankAccountTester.java whose main method
instantiates an account, deposits and withdraws and prints the account.  You should consider
writing your own to test as well.