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Standard library header <limits.h> - cppreference.com

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This header is part of the type support library, in particular it's part of the C numeric limits interface.

Limits of core language integer types

BOOL_WIDTH

(C23)

 bit width of _Bool
(macro constant)

BOOL_MAX

(C29)

 maximum value of _Bool
(macro constant)

CHAR_BIT

 bit width of byte
(macro constant) [edit]

MB_LEN_MAX

 maximum number of bytes in a multibyte character
(macro constant) [edit]

CHAR_WIDTH

(C23)

 bit width of char, same as CHAR_BIT
(macro constant)

CHAR_MIN

 minimum value of char
(macro constant) [edit]

CHAR_MAX

 maximum value of char
(macro constant) [edit]

SCHAR_WIDTHSHRT_WIDTHINT_WIDTHLONG_WIDTHLLONG_WIDTH

(C23)(C23)(C23)(C23)(C23)

 bit width of signed char, short, int, long, and long long respectively
(macro constant)

SCHAR_MINSHRT_MININT_MINLONG_MINLLONG_MIN

(C99)

 minimum value of signed char, short, int, long and long long respectively
(macro constant) [edit]

SCHAR_MAXSHRT_MAXINT_MAXLONG_MAXLLONG_MAX

(C99)

 maximum value of signed char, short, int, long and long long respectively
(macro constant) [edit]

UCHAR_WIDTHUSHRT_WIDTHUINT_WIDTHULONG_WIDTHULLONG_WIDTH

(C23)(C23)(C23)(C23)(C23)

 bit width of unsigned char, unsigned short, unsigned int, unsigned long, and unsigned long long respectively
(macro constant)

UCHAR_MAXUSHRT_MAXUINT_MAXULONG_MAXULLONG_MAX

(C99)

 maximum value of unsigned char, unsigned short, unsigned int,
unsigned long and unsigned long long respectively
(macro constant) [edit]

BITINT_MAXWIDTH

(C23)

 maximum width N supported by the declaration of a bit-precise integer in the type specifier _BitInt(N), greater than or equal to ULLONG_WIDTH
(macro constant)

Synopsis

#define __STDC_VERSION_LIMITS_H__ 202311L

#define BITINT_MAXWIDTH  /* see description */
#define BOOL_MAX         /* see description */
#define BOOL_WIDTH       /* see description */
#define CHAR_BIT         /* see description */
#define CHAR_MAX         /* see description */
#define CHAR_MIN         /* see description */
#define CHAR_WIDTH       /* see description */
#define INT_MAX          /* see description */
#define INT_MIN          /* see description */
#define INT_WIDTH        /* see description */
#define LLONG_MAX        /* see description */
#define LLONG_MIN        /* see description */
#define LLONG_WIDTH      /* see description */
#define LONG_MAX         /* see description */
#define LONG_MIN         /* see description */
#define LONG_WIDTH       /* see description */
#define MB_LEN_MAX       /* see description */
#define SCHAR_MAX        /* see description */
#define SCHAR_MIN        /* see description */
#define SCHAR_WIDTH      /* see description */
#define SHRT_MAX         /* see description */
#define SHRT_MIN         /* see description */
#define SHRT_WIDTH       /* see description */
#define UCHAR_MAX        /* see description */
#define UCHAR_WIDTH      /* see description */
#define UINT_MAX         /* see description */
#define UINT_WIDTH       /* see description */
#define ULLONG_MAX       /* see description */
#define ULLONG_WIDTH     /* see description */
#define ULONG_MAX        /* see description */
#define ULONG_WIDTH      /* see description */
#define USHRT_MAX        /* see description */
#define USHRT_WIDTH      /* see description */