As you have seen, it is not difficult to make computers store numbers using switch technology. The only numbers we have seen, however, are whole numbers. Whole numbers, as you remember, are those numbers we count with, starting with zero (0,1,2,3...). Binary notation makes it relatively easy to store and work with whole numbers, but these are not the only kind of information we want to work with. Computer scientists have developed ways of making computers recognize other kinds of values.