Lexical conventions

hex-quad:  


hexadecimal-digit hexadecimal-digit hexadecimal-digit hexadecimal-digit  


universal-character-name:  

		\u hex-quad  

		\U hex-quad hex-quad  


preprocessing-token:  


header-name  


identifier  


pp-number  


character-literal  


string-literal  


preprocessing-op-or-punc  


each non-white-space character that cannot be one of the above


token:  


identifier  


keyword  


literal  


operator  


punctuator  


header-name:  

		                  <h-char-sequence>  

		                  "q-char-sequence" 


h-char-sequence:  


h-char  


h-char-sequence h-char  


h-char:  


any member of the source character set   except new-line and > 


q-char-sequence:  


q-char  


q-char-sequence q-char  


q-char:  


any member of the source character set except                          new-line and " 




pp-number:  


digit  

		. digit  


pp-number digit  


pp-number nondigit  


pp-number e sign  


pp-number E sign  


pp-number .identifier:  


nondigit  


identifier nondigit  


identifier digit  


nondigit:  one of 


universal-character-name  

		\_ 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:  one of 

		0 1 2 3 4 5 6 7 8 9 


preprocessing-op-or-punc:  one of 

		{       }       [       ]       #       ##      (       ) 

		<:      :>      <%      %>      %:      %:%:    ;       :       ... 

		new     delete  ?       ::      .       .* 

		+       -       *       /       %       ^       &              ~ 

		!       =       <       >       +=      -=      *=      /=      %= 

		^=      &=      |=      <<      >>      >>=     <<=     ==      != 

		<=      >=      &&      ||      ++      --      ,       ->*     -> 

		and     and_eq  bitand  bitor   compl   not     not_eq  or      or_eq 

		xor     xor_eq 


literal:  


integer-literal  


character-literal  


floating-literal  


string-literal  


boolean-literal  


integer-literal:  


decimal-literal integer-suffix$_{\mathsf{opt}}$ 


octal-literal integer-suffix$_{\mathsf{opt}}$ 


hexadecimal-literal integer-suffix$_{\mathsf{opt}}$ 


decimal-literal:  


nonzero-digit  


decimal-literal digit  


octal-literal:  

		0 


octal-literal octal-digit  


hexadecimal-literal:  

		0x hexadecimal-digit  

		0X hexadecimal-digit  


hexadecimal-literal hexadecimal-digit  


nonzero-digit:  one of  

		1  2  3  4  5  6  7  8  9  


octal-digit:  one of  

		0  1  2  3  4  5  6  7 


hexadecimal-digit:  one of  

		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$_{\mathsf{opt}}$ 


long-suffix unsigned-suffix$_{\mathsf{opt}}$ 


unsigned-suffix:  one of  

		u  U  


long-suffix:  one of  

		l  L  


character-literal:  

		'c-char-sequence'  

		L'c-char-sequence'  


c-char-sequence:  


c-char  


c-char-sequence c-char  


c-char:  


any member of the source character set except 


the single-quote '  , backslash \  , or new-line character 


escape-sequence  


universal-character-name  


escape-sequence:  


simple-escape-sequence  


octal-escape-sequence  


hexadecimal-escape-sequence  


simple-escape-sequence:  one of 

		\'  \"  \? \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  


floating-literal:  


fractional-constant exponent-part$_{\mathsf{opt}}$ floating-suffix$_{\mathsf{opt}}$ 


digit-sequence exponent-part floating-suffix$_{\mathsf{opt}}$ 


fractional-constant:  


digit-sequence$_{\mathsf{opt}}$ . digit-sequence  


digit-sequence .exponent-part:  

		e sign$_{\mathsf{opt}}$ digit-sequence  

		E sign$_{\mathsf{opt}}$ digit-sequence  


sign:  one of  

		+  - 


digit-sequence:  


digit  


digit-sequence digit  


floating-suffix:  one of 

		f  l  F  L 


string-literal:  

		"s-char-sequence$_{\mathsf{opt}}$" 

		L"s-char-sequence$_{\mathsf{opt}}$" 


s-char-sequence:  


s-char  


s-char-sequence s-char  


s-char:  


any member of the source character set except 


the double-quote "  , backslash \  , or new-line character 


escape-sequence  


universal-character-name  


boolean-literal:  

		false  

		true