C language:

Write a program that translates an alphabetic phone number into numeric form: Enter phone number: CALLATT 2255288 (In case you don't have a telephone nearby, here are the letters on the keys: 2:ABC. 3:DEF. 4:GHI. 5:JKL, 6:MNO. 7:PRS. 8:TUV. 9:WXY) If the original phone number contains non-alphabetic characters (digits or punctuation, for example), leave them unchanged: Enter phone number: 1-800-COL-LECT 1-800-265-5328 You may assume that any letters entered by the user is upper case. (use getchar() for reading the entries. Please note, as an example, you can use putchar('1') to write 1 or putchar(ch) to write the character stored in ch)