B. Draw a physical level 0 DFD for the following system and compare it with the logical model that you created in Chapter 5. A Video Store (AVS) runs a series of fairly standard video stores. Before a video can be put on the shelf, it must be catalogued and entered into the video database. To rent a video, every customer must have a valid AVS customer card. Customers rent videos for three days at a time. Every time a customer rents a video, the system must ensure that he or she does not have any overdue videos. If so, the overdue videos must be returned and the customer must pay a fine before renting more videos. Likewise, if the customer has returned over- due videos, but has not paid the fine, the fine must be paid before new videos can be rented. Every morning, the store manager prints a report that lists overdue videos; if a video is two or more days overdue, the manager calls the customer to remind him or her to return the video. If a video is returned in damaged condition, the manager removes it from the video database and sometimes charges the customer.

C. What symbols would you use to depict the following situations on a structure chart?

A function occurs multiple times before the next module is invoked.

A function is continued on the bottom of the page of the structure chart.

A customer record is passed from one part of the program to another.

The program will print a record either on screen or on a printer, depending on the users preference.

A customers ID is passed from one part of the program to another.

A function cannot fit on the current page of the structure chart.