HP 3000 Manuals HP 3000 Manuals
Tokens
A token is the smallest lexical element of the C language.
Syntax
token ::= keyword
identifier
constant
string-literal
operator
punctuator
Description
The compiler combines input characters together to form the longest token
possible when collecting characters into tokens. For example, the
sequence integer is interpreted as a single identifier rather than the
reserved keyword int followed by the identifier eger.
[REV BEG]
A token cannot exceed 509 characters in length. Consecutive source code
lines can be concatenated together using the backslash (\) character at
the end of the line to be continued. The total number of characters in
the concatenated source lines cannot exceed 509.[REV END]
The term white space refers to the set of characters that includes
spaces, horizontal tabs, newline characters, vertical tabs, form feeds,
and comments. You can use white space freely between tokens, and extra
spaces are ignored in your programs. But note that at least one space
may be required to separate tokens. So, a character such as a hyphen (-)
can take on different meanings depending upon the white space around it.
For example:
a- -1
is different from
a--1
Keywords
The following keywords are reserved in the C language. You cannot use
them as program identifiers. Type them as shown, using lowercase
characters.
auto do goto signed union
break double if sizeof unsigned
case else int static void
char enum long sizeof volatile
const extern register struct while
continue float return switch
default for short typedef