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integer-constant: decimal-constant integer-suffixopt octal-constant integer-suffixopt hexadecimal-constant integer-suffixoptone of
decimal-constant: nonzero-digit decimal-constant digit
hexadecimal-constant: hexadecimal-prefix hexadecimal-digit hexadecimal-constant 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-suffixopt unsigned-suffix long-long-suffix long-suffix unsigned-suffixopt long-long-suffix unsigned-suffixopt
unsigned-suffix:one of u U
long-suffix:one of l L
long-long-suffix:one of ll LL
826 An integer constant begins with a digit, but has no period or exponent part.
827 It may have a prefix that specifies its base and a suffix that specifies its type.
828 A decimal constant begins with a nonzero digit and consists of a sequence of decimal digits.
An octal constant consists of the prefix
A hexadecimal constant consists of the prefix
831 The value of a decimal constant is computed base 10;
832 that of an octal constant, base 8;
833 that of a hexadecimal constant, base 16.
834 The lexically first digit is the most significant.
835 The type of an integer constant is the first of the corresponding list in which its value can be represented.
836 .TABLE : l l l Suffix , Decimal Constant , Octal or Hexadecimal Constant
837 If an integer constant cannot be represented by any type in its list, it may have an extended integer type, if the extended integer type can represent its value.
838 If all of the types in the list for the constant are signed, the extended integer type shall be signed.
839 If all of the types in the list for the constant are unsigned, the extended integer type shall be unsigned.
840 If the list contains both signed and unsigned types, the extended integer type may be signed or unsigned.
Created at: 2008-01-30 02:39:41
The text from WG14/N1256 is copyright © ISO
Created at: 2008-01-30 02:39:41 The text from WG14/N1256 is copyright © ISO