This was an extra credit assignment for chapter 4 in the textbook. It simulates credits and debits to a checking account. It starts at a zero balance, then users can manipulate the balance of the account by either logging transactions for depositing money, writing a check, or a service charge. If the user simulates writing a check for more than the balance in the account, the program displays an error and deducts a service fee for attempting to overdraw the account.