Create a telephone directory file with 3 fields per line: first name, last name, and telephone number, separating the 3 fields by spaces. use a menu-driven interface that allows the used to: 1) enter a number (and you find the name), 2) enter a name (and you find the number), or 3) exit the input loop. both options 1) and 2) should have their own lookup functions. to return to the top of the file at the end of each loop: close and reopen the file; be sure to close the file before you exit.