Chapter 9 cengage defined the struct studenttype to implement the basic properties of a student. define the class studenttype with the same components as the struct studenttype, and add member functions to manipulate the data members. (note that the data members of the class studenttype must be private.) write a program to illustrate how to use the class studenttype.

Write a method public static string getdigits(string phonenumber) that takes an 11-character phone number written with any combination of 11 uppercase letters, lowercase letters and/or digits, and zero or more hyphens, and which returns the digits that a person would have to press on a cell phone to dial that phone number. we will use the mapping of letters to digits given at en.wikipedia.org/wiki/telephone_keypad# /media/file: telephone-keypad2.svg you may assume that the string parameter phonenumber contains some combination of exactly 11 uppercase letters, lowercase letters and/or digits, but that any number of hyphens may be present. you can assume that a hyphen will not appear as the first or last character of the string. do not assum