Lab #5

Standard telephone keypads contain the digits 0 through 9. Digits 2 through 9 each have three or four letters associated with them, as follows: 2: A, B, C 3: D, E, F 4: G, H, I 5: J, K, L 6: M, N, O 7: P, Q, R, S 8: T, U, V 9: W, X, Y, Z Each 7 digit phone number corresponds to many separate 7 letter words. One of the possible letter combination for the number 639-2277 is "NEWCARS". Write a program that, given a seven digit number, writes to a file every possible combination corresponding to that number. Avoid phone numbers with digits 0 or 1. Q: How many such combinations are there? The program has a GUI that allows the user to enter the phone number. The GUI also allows browsing by using the file chooser, to find the output file and allows for a text area to display the contents of the file. A sample file is provided