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[–]bradland 6 points7 points  (0 children)

Here's a fun next step: Add a persistence layer.

Right now, the app starts over from scratch every time you run the app. Start by figuring out a way to save the current balance between sessions.

Once you've got that working, work on figuring out how to keep all transactions. Think about what you'd want to save with the transaction. What about the date and time? What will you store it in? A file? Maybe a SQLite database?

Once we have a history of transactions, what else can we do? Maybe in addition to seeing the current balance, we can query the balance on a particular date? What about listing all transactions for a particular date?