15. For the following codes, define the validation criteria (there may be multiple checks for each field)

and the order in which you would test each of the conditions.

a. A credit card number entered on a Web form: The customer has selected the type of credit card from a drop-down list.

b. A part number in a hardware store: The part number is a complex code, where the first digit represents the department (such as housewares, automotive, and so on), and the number should be self-checking. There are seven different departments.

c. The date that a book was postmarked when returned to an online bookstore: A copy of the customer receipt must be included with the book. Returned books must be postmarked within 30 days of the purchase date.

d. A language spoken code used on a website: Hint: Search the Web for standard language codes.

e. A driver’s license number, composed of several parts: The person’s birth month, the birth day, and birth year, not necessarily together; a code representing eye color; and a sequence number.

The driver’s license contains the date of birth, the eye and hair color, as well as the person’s name and address.

f. The Canadian postal code: The format is X9X 9X9 (X is any letter, 9 is any number).

g. Airport codes: Such as LAX for Los Angeles or DUB for Dublin.

h. A product key used to unlock purchased software: The key consists of four groups of five characters each. The first group must have two letters followed by three numbers; the second group must contain two numbers followed by three letters; the third group must contain two letters, each from A through G, followed by three numbers from one through four; and the last group must contain a letter, either an E, G, or C, two digits with values from four through seven, and two letters, either an A, B, or C. Hint: Using a pattern may be the best way to validate the product key.