5.2.4.2.1 Sizes of integer types <limits.h>

1

The values given below shall be replaced by constant expressions suitable for use in #if preprocessing directives. Moreover, except for CHAR_BIT and MB_LEN_MAX, the following shall be replaced by expressions that have the same type as would an expression that is an object of the corresponding type converted according to the integer promotions. Their implementation-defined values shall be equal or greater in magnitude (absolute value) to those shown, with the same sign.

Identifier	Value	Comment
number of bits for smallest object that is not a bit-field (byte)
CHAR_BIT	8

minimum value for an object of type signed char
SCHAR_MIN	$-127$	$-(2^7 - 1)$
maximum value for an object of type signed char
SCHAR_MAX	$+127$	$2^7 - 1$
maximum value for an object of type unsigned char
UCHAR_MAX	$255$	$2^8 - 1$
minimum value for an object of type char
CHAR_MIN		see below
maximum value for an object of type char
CHAR_MAX		see below
maximum number of bytes in a multibyte character, for any supported locale
MB_LEN_MAX	1
minimum value for an object of type short int
SHRT_MIN	$-32767$	$-(2^{15} - 1)$
maximum value for an object of type short int
SHRT_MAX	$+32767$	$2^{15} - 1$
maximum value for an object of type unsigned short int
USHRT_MAX	$65535$	$2^{16}- 1$
minimum value for an object of type int
INT_MIN	$-32767$	$-(2^{15}- 1)$
maximum value for an object of type int
INT_MAX	$+32767$	$2^{15}- 1$
maximum value for an object of type unsigned int
UINT_MAX	$65535$	$2^{16}- 1$
minimum value for an object of type long int
LONG_MIN	$-2147483647$	$-(2^{31}- 1)$
maximum value for an object of type long int
LONG_MAX	$+2147483647$	$2^{31}- 1$
maximum value for an object of type unsigned long int
ULONG_MAX	$4294967295$	$2^{32}- 1$
minimum value for an object of type long long int
LLONG_MIN	$-9223372036854775807$	$-(2^{63}- 1)$
maximum value for an object of type long long int
LLONG_MAX	$+9223372036854775807$	$2^{63}- 1$
maximum value for an object of type unsigned long long int
ULLONG_MAX	$18446744073709551615$	$2^{64}- 1$

2

If the value of an object of type char is treated as a signed integer when used in an expression, the value of CHAR_MIN shall be the same as that of SCHAR_MIN and the value of CHAR_MAX shall be the same as that of SCHAR_MAX. Otherwise, the value of CHAR_MIN shall be 0 and the value of CHAR_MAX shall be the same as that of UCHAR_MAX.[1] The value UCHAR_MAX shall equal 2^CHAR_BIT - 1.

Forward References

6.2.6 Representations of types

6.10.1 Conditional inclusion

Footnotes