Tokens |
 |
token ::= keyword
identifier
constant
string-literal
operator
punctuator
preprocessing-token ::=
header-name
identifier
pp-number
character-constant
string-literal
operator
punctuator
each non-white-space character cannot be one
of the above
Keywords |
|
keyword ::= any word from the set:
auto extern sizeof
break float static
case for struct
char goto switch
const if __thread (HP-UX 10.30 and later)
continue int typedef
default long union
do register unsigned
double return void
else short volatile
enum signed while
Identifiers |
|
identifier ::= nondigit
identifier nondigit
identifier digit
identifier dollar-sign
nondigit ::= any character from the set:
_ a b c d e f g h i j k l m n o p
q r s t u v w x y z A B C D E F G
H I J K L M N O P Q R S T U V W X
Y Z
digit ::= any character from the set:
0 1 2 3 4 5 6 7 8 9
dollar-sign ::= the $ character
Constants |
|
constant ::=
floating-constant
integer-constant
enumeration-constant
character-constant
floating-constant ::=
fractional-constant [exponent-part] [floating-suffix]
digit-sequence exponent-part [floating-suffix]
fractional-constant ::=
[digit-sequence] . digit-sequence
digit-sequence .
exponent-part ::=
e [sign] digit-sequence
E [sign] digit-sequence
sign ::=
+
-
digit-sequence ::=
digit
digit-sequence digit
floating-suffix ::=
f l F L
integer-constant ::=
decimal-constant [integer-suffix]
octal-constant [integer-suffix]
hexadecimal-constant [integer-suffix]
decimal-constant ::=
nonzero-digit
decimal-constant digit
octal-constant ::=
0
octal-constant octal-digit
hexadecimal-constant ::=
0x hexadecimal-digit
0X hexadecimal-digit
hexadecimal-constant hexadecimal-digit
nonzero-digit ::= any character from the set:
1 2 3 4 5 6 7 8 9
octal-digit ::= any character from the set
0 1 2 3 4 5 6 7
hexadecimal-digit ::= any character from the set
0 1 2 3 4 5 6 7 8 9
a b c d e f
A B C D E F
integer-suffix ::=
unsigned-suffix [long-suffix]
length-suffix [unsigned-suffix]
unsigned-suffix ::=
u U
length-suffix ::=
long-suffix
long-long-suffix
long-suffix ::= any character from the set
l L
long-long-suffix ::= any character from the set
ll LL Ll lL
enumeration-constant ::= identifier
character-constant ::=
'c-char-sequence'
L'c-char-sequence'
c-char-sequence ::=
c-char
c-char-sequence c-char
c-char ::=
any character in the source character set except
the single quote ('), backslash (\), or new-line character
escape-sequence
escape-sequence ::=
simple-escape-sequence
octal-escape-sequence
hexadecimal-escape-sequence
simple-escape-sequence ::=
\' \" \? \\ \ddd \xdd
\a \b \f \n \r \t \v
octal-escape-sequence ::=
\ octal-digit
\ octal-digit octal-digit
\ octal-digit octal-digit octal-digit
hexadecimal-escape-sequence ::=
\x hexadecimal-digit
hexadecimal-escape-sequence hexadecimal-digit
String
Literals |
|
string-literal ::=
"[s-char-sequence]"
L"[s-char-sequence]"
s-char-sequence ::=
s-char
s-char-sequence s-char
s-char ::=
any character in the source character set except
the double-quote (") , backslash (\), or new-line
character escape-sequence
Operators |
|
operator ::= One selected from:
[ ] ( ) . ->
++ -- & * + - ~ ! sizeof
/ % << >> < > <= >= == != ^ |
&& || ? :
= *= /= %= += -= <<= >>= &= ^= |=
, # ##
Punctuators |
|
punctuator ::= One selected from:
[ ] ( ) { } * , : = ; ... #
Header
Names |
|
header-name ::=
<h-char-sequence>
"q-char-sequence"
h-char-sequence ::=
h-char
h-char-sequence h-char
h-char ::=
any character in the source character set except
the newline character and >
q-char-sequence ::=
q-char
q-char-sequence q-char
q-char ::=
any character in the source character set except
the newline character and "
Preprocessing
Numbers |
|
pp-number ::=
digit
. digit
pp-number digit
pp-number nondigit
pp-number e sign
pp-number E sign
pp-number .
