As we said in the previous topic, many things in a programming language have both a name and a value. The choice of name is important, and the sidebar on page 21 gives several rules for assigning names or identifiers. Note that the last item in that list is in error – it is just a continuation of the previous item.
Table 2-1 on the same page lists the C++ Keywords. You may not use these keywords as a name.
In addition to the above list, Table 2-2 is also a list of keywords that must be avoided. You will not have occasion to use these keywords unless you are programming for an environment in which the keyboard does not support symbols such as |, &, <, >, !, etc.