Visual Basic 2010 How to Program Deitel Exercise 7.15 Telephone-Number Word Generator
(Telephone-Number Word Generator) Standard telephone keypads contain the digits zero through nine. The numbers two through nine each have three letters associated with them(Fig 7.29). Many people find it difficult to memorize phone numbers, so they use the correspondence between digits and letters to develop seven-letter words that correspond to their phone numbers. For example, a person whose telephone number is 686-2377 might use the correspondence indicated in Fig. 7.29 to develop the seven-letter word “NUMBERS.” Every seven-letter word corresponds to exactly one seven-digit telephone number. A restaurant wishing to increase its takeout business could surely do so with the numbers 825-3688 (that is, “TAKEOUT”). Every seven-letter phone number corresponds to many different seven-letter combinations. Unfortunately, most of these represent unrecognizable juxtapositions of letter. It’s possible, however, that the owner of a barbershop would be pleased to know that the shop’s telephone number, 424-7288, corresponds to “HAIRCUT.” A veterinarian with the phone number 738-2273 would be pleased to know that the number corresponds to the letters “PETCARE.” An automotive dealership would be pleased to know that the dealership number, 639-2277, corresponds to “NEW CARS.”
Write an application that allows the user to enter a seven-digit number in a TextBox, and displays every possible seven-letter word combination corresponding to that number in a multiple line scrollable TextBox when the user clicks the Generate Words button. There are 2,187 (3 To the seventh power) such combinations. Avoid phone numbers with the digits 0 and 1.