Reference no: EM132432167

To make telephone numbers easier to remember, some companies use digits and letters (or only letters) to show their telephone number. In some cases, to make a telephone number meaningful, companies might use more than seven digits and letters. Here are some examples:

Phone Number in Display Note Actual Phone Number

Get Loan - 438-5626

Call Home More than 7 digits 255-5466

111 GOLD - 111-4653

Glass4u - 452-7748

Compose a program that prompts the user to enter a telephone number expressed in letters (or digits and letters) and outputs the corresponding telephone number in digits. If the user enters more than seven characters, then process only the first seven valid digits. Also output a - (hyphen) after the third digit. Allow the user to use digits, both uppercase and lowercase letters, and spaces between words.

If a number contains invalid letters such as a number GOT $$99, your program should report and terminate the processing of that phone number (do not terminate the whole program) and ask for another number. Your program should process as many telephone numbers as the user wants. You may use any valid approach to allow multiple sessions until user chooses to stop, such as CTRL+Z, enter y/n, enter q and so on. Whatever approach you use, provide proper prompt message(s) to users so they know how to use your program.