Summary of Tokens

token :

keyword
identifier
constant
string-literal
operator
punctuator

preprocessing-token :

header-name
identifier
pp-number
character-constant
string-literal
operator
punctuator
each nonwhite-space character that cannot be one of the above

header-name :

< path-spec >
"path spec"

path-spec :

Legal file path

pp-number :

digit
. digit
pp-number digit
pp-number nondigit
pp-number e sign
pp-number E sign
pp-number .