stdint.h File Reference

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Macros
Limits of specified-width integer types
C++ implementations should define these macros only when __STDC_LIMIT_MACROS is defined before <stdint.h> is included
#define	INT8_MAX   0x7f
#define	INT8_MIN   (-INT8_MAX - 1)
#define	UINT8_MAX   (INT8_MAX * 2 + 1)
#define	INT16_MAX   0x7fff
#define	INT16_MIN   (-INT16_MAX - 1)
#define	UINT16_MAX   (__CONCAT(INT16_MAX, U) * 2U + 1U)
#define	INT32_MAX   0x7fffffffL
#define	INT32_MIN   (-INT32_MAX - 1L)
#define	UINT32_MAX   (__CONCAT(INT32_MAX, U) * 2UL + 1UL)
#define	INT64_MAX   0x7fffffffffffffffLL
#define	INT64_MIN   (-INT64_MAX - 1LL)
#define	UINT64_MAX   (__CONCAT(INT64_MAX, U) * 2ULL + 1ULL)
Limits of minimum-width integer types
#define	INT_LEAST8_MAX   INT8_MAX
#define	INT_LEAST8_MIN   INT8_MIN
#define	UINT_LEAST8_MAX   UINT8_MAX
#define	INT_LEAST16_MAX   INT16_MAX
#define	INT_LEAST16_MIN   INT16_MIN
#define	UINT_LEAST16_MAX   UINT16_MAX
#define	INT_LEAST32_MAX   INT32_MAX
#define	INT_LEAST32_MIN   INT32_MIN
#define	UINT_LEAST32_MAX   UINT32_MAX
#define	INT_LEAST64_MAX   INT64_MAX
#define	INT_LEAST64_MIN   INT64_MIN
#define	UINT_LEAST64_MAX   UINT64_MAX
Limits of fastest minimum-width integer types
#define	INT_FAST8_MAX   INT8_MAX
#define	INT_FAST8_MIN   INT8_MIN
#define	UINT_FAST8_MAX   UINT8_MAX
#define	INT_FAST16_MAX   INT16_MAX
#define	INT_FAST16_MIN   INT16_MIN
#define	UINT_FAST16_MAX   UINT16_MAX
#define	INT_FAST32_MAX   INT32_MAX
#define	INT_FAST32_MIN   INT32_MIN
#define	UINT_FAST32_MAX   UINT32_MAX
#define	INT_FAST64_MAX   INT64_MAX
#define	INT_FAST64_MIN   INT64_MIN
#define	UINT_FAST64_MAX   UINT64_MAX
Limits of integer types capable of holding object pointers
#define	INTPTR_MAX   INT16_MAX
#define	INTPTR_MIN   INT16_MIN
#define	UINTPTR_MAX   UINT16_MAX
Limits of greatest-width integer types
#define	INTMAX_MAX   INT64_MAX
#define	INTMAX_MIN   INT64_MIN
#define	UINTMAX_MAX   UINT64_MAX
Limits of other integer types
C++ implementations should define these macros only when __STDC_LIMIT_MACROS is defined before <stdint.h> is included
#define	PTRDIFF_MAX   INT16_MAX
#define	PTRDIFF_MIN   INT16_MIN
#define	SIG_ATOMIC_MAX   INT8_MAX
#define	SIG_ATOMIC_MIN   INT8_MIN
#define	SIZE_MAX   UINT16_MAX
#define	WCHAR_MAX   __WCHAR_MAX__
#define	WCHAR_MIN   __WCHAR_MIN__
#define	WINT_MAX   __WINT_MAX__
#define	WINT_MIN   __WINT_MIN__
Macros for integer constants
C++ implementations should define these macros only when __STDC_CONSTANT_MACROS is defined before <stdint.h> is included. These definitions are valid for integer constants without suffix and for macros defined as integer constant without suffix
#define	INT8_C(value)   ((int8_t) value)
#define	UINT8_C(value)   ((uint8_t) __CONCAT(value, U))
#define	INT16_C(value)   value
#define	UINT16_C(value)   __CONCAT(value, U)
#define	INT32_C(value)   __CONCAT(value, L)
#define	UINT32_C(value)   __CONCAT(value, UL)
#define	INT64_C(value)   __CONCAT(value, LL)
#define	UINT64_C(value)   __CONCAT(value, ULL)
#define	INTMAX_C(value)   __CONCAT(value, LL)
#define	UINTMAX_C(value)   __CONCAT(value, ULL)

Typedefs
Exact-width integer types
Integer types having exactly the specified width
typedef signed char	int8_t
typedef unsigned char	uint8_t
typedef signed int	int16_t
typedef unsigned int	uint16_t
typedef signed long int	int32_t
typedef unsigned long int	uint32_t
typedef signed long long int	int64_t
typedef unsigned long long int	uint64_t
Integer types capable of holding object pointers
These allow you to declare variables of the same size as a pointer.
typedef int16_t	intptr_t
typedef uint16_t	uintptr_t
Minimum-width integer types
Integer types having at least the specified width
typedef int8_t	int_least8_t
typedef uint8_t	uint_least8_t
typedef int16_t	int_least16_t
typedef uint16_t	uint_least16_t
typedef int32_t	int_least32_t
typedef uint32_t	uint_least32_t
typedef int64_t	int_least64_t
typedef uint64_t	uint_least64_t
Fastest minimum-width integer types
Integer types being usually fastest having at least the specified width
typedef int8_t	int_fast8_t
typedef uint8_t	uint_fast8_t
typedef int16_t	int_fast16_t
typedef uint16_t	uint_fast16_t
typedef int32_t	int_fast32_t
typedef uint32_t	uint_fast32_t
typedef int64_t	int_fast64_t
typedef uint64_t	uint_fast64_t
Greatest-width integer types
Types designating integer data capable of representing any value of any integer type in the corresponding signed or unsigned category
typedef int64_t	intmax_t
typedef uint64_t	uintmax_t