Answer 1

You are showing balance while performing 'deposit' or 'withdraw' operation. How will you show balance when user doesn't want to perform these operations but still wants to see the balance amount.

One person can transfer money to any other person. In this case you can add a function so that one instance of class can transfer money to other instance of the same class. The function will take two arguments first how much you want to transfer & second to whom you want to send.

Answer 2

Show balance, Money transfer features can be added :)

Answer 3

There is no limit to adding features. The more you think, more ideas will come. If you want to practice more you can move to Hackerrank or CodeChef or any Other platform of your choice.