1.You are implementing an application for managing a very small coffee shop. The application will allow users to swipe a card and select from three options:

-Check account balance.

-Add funds to account.

-Make a purchase.

You can assume that there is a web service available that manages the cards, providing functions such as:

-Read card and log in.

-Log out.

-Check balance.

-Add funds.

-Spend funds.

The coffee shop sells:

-Plain coffee ($3 each)

-Fancy coffee ($5 each)

-Muffins ($2 each)

A user can select any number of coffees of each type and any number of muffins. A transaction is incomplete if:

-The card cannot be read.

-The user cannot be logged in.

-The balance is insufficient for the purchase amount.

-The deposit fails to add funds.

A completed deposit will spend funds from the user.

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