Exercises

15.4 (File Matching) Self-Review Exercise 15.2 asked you to write a series of single statements. Actually, these statements form the core of an important type of file-processing program—namely, a file-matching program. In commercial data processing, it’s common to have several files in each application system. In an accounts receivable system, for example, there’s generally a master file containing detailed information about each customer, such as the customer’s name, address, telephone number, outstanding balance, credit limit, discount terms, contract arrangements and possibly a condensed history of recent purchases and cash payments.

As transactions occur (i.e., sales are made and payments arrive in the mail), information about ...

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