CS50

1. Pick up phone book 2. Open to middle of phone book 3. look at page 4. If Smith is on page 5.                 Call Mike 6. Else if smith is earlier in book 7.            Open to middle of left half of book 8.             Go back to line 3 9.  Else if Smith is later in book 10.          Open to middle of right half of book 11.           Go back to line 3 12.  Else 13.  Quit