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Automatic Underground Ticket Machine

The management of the Underground train service have requested an automatic ticket machine to function as outlined:

The user enters their destination and ticket type into the machine (e.g. single, return or day return) and the machine calculates and displays the price. When enough money has been put in the machine issues a date-stamped ticket containing the issuing station, the destination, ticket type and price. If appropriate the machine also gives change. The machine records the details of every ticket issued and records travel statistics such as the number of tickets issued for each destination and the number of tickets of each type for each day. Once a week these statistics are transferred to the main computer.