Write a program that inserts parentheses, a space, and a dash into a string of 10 user-entered numbers to format it as a phone number. For example, XXXXXXXXXXbecomes XXXXXXXXXXIf the user does not...

Write a program that inserts parentheses, a space, and a dash into a stringof 10 user-entered numbers to format it as a phone number. For example, 5153458912 becomes (515) 345-8912. If the user does not enter exactly 10 digits, display an error message. Continue to accept user input until the userenters 999.