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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