<stdint.h>: Standard Integer Types(3)

NAME
<stdint.h>: Standard Integer Types -

Detailed Description

 #include <stdint.h>

Use [u]intN_t if you need exactly N bits.

Since these typedefs are mandated by the C99 standard, they are preferred over rolling your own typedefs.

  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 (__CONCAT(INT8_MAX, U) * 2U + 1U)
#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 (__CONCAT(INT16_MAX, U))

  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)

  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

Define Documentation

  #define INT16_C(value) value

define a constant of type int16_t

  #define INT16_MAX 0x7fff

largest positive value an int16_t can hold.

  #define INT16_MIN (-INT16_MAX - 1)

smallest negative value an int16_t can hold.

  #define INT32_C(value) __CONCAT(value, L)

define a constant of type int32_t

  #define INT32_MAX 0x7fffffffL

largest positive value an int32_t can hold.

  #define INT32_MIN (-INT32_MAX - 1L)

smallest negative value an int32_t can hold.

  #define INT64_C(value) __CONCAT(value, LL)

define a constant of type int64_t

  #define INT64_MAX 0x7fffffffffffffffLL

largest positive value an int64_t can hold.

  #define INT64_MIN (-INT64_MAX - 1LL)

smallest negative value an int64_t can hold.

  #define INT8_C(value) ((int8_t) value)

define a constant of type int8_t

  #define INT8_MAX 0x7f

largest positive value an int8_t can hold.

  #define INT8_MIN (-INT8_MAX - 1)

smallest negative value an int8_t can hold.

  #define INT_FAST16_MAX INT16_MAX

largest positive value an int_fast16_t can hold.

  #define INT_FAST16_MIN INT16_MIN

smallest negative value an int_fast16_t can hold.

  #define INT_FAST32_MAX INT32_MAX

largest positive value an int_fast32_t can hold.

  #define INT_FAST32_MIN INT32_MIN

smallest negative value an int_fast32_t can hold.

  #define INT_FAST64_MAX INT64_MAX

largest positive value an int_fast64_t can hold.

  #define INT_FAST64_MIN INT64_MIN

smallest negative value an int_fast64_t can hold.

  #define INT_FAST8_MAX INT8_MAX

largest positive value an int_fast8_t can hold.

  #define INT_FAST8_MIN INT8_MIN

smallest negative value an int_fast8_t can hold.

  #define INT_LEAST16_MAX INT16_MAX

largest positive value an int_least16_t can hold.

  #define INT_LEAST16_MIN INT16_MIN

smallest negative value an int_least16_t can hold.

  #define INT_LEAST32_MAX INT32_MAX

largest positive value an int_least32_t can hold.

  #define INT_LEAST32_MIN INT32_MIN

smallest negative value an int_least32_t can hold.

  #define INT_LEAST64_MAX INT64_MAX

largest positive value an int_least64_t can hold.

  #define INT_LEAST64_MIN INT64_MIN

smallest negative value an int_least64_t can hold.

  #define INT_LEAST8_MAX INT8_MAX

largest positive value an int_least8_t can hold.

  #define INT_LEAST8_MIN INT8_MIN

smallest negative value an int_least8_t can hold.

  #define INTMAX_C(value) __CONCAT(value, LL)

define a constant of type intmax_t

  #define INTMAX_MAX INT64_MAX

largest positive value an intmax_t can hold.

  #define INTMAX_MIN INT64_MIN

smallest negative value an intmax_t can hold.

  #define INTPTR_MAX INT16_MAX

largest positive value an intptr_t can hold.

  #define INTPTR_MIN INT16_MIN

smallest negative value an intptr_t can hold.

  #define PTRDIFF_MAX INT16_MAX

largest positive value a ptrdiff_t can hold.

  #define PTRDIFF_MIN INT16_MIN

smallest negative value a ptrdiff_t can hold.

  #define SIG_ATOMIC_MAX INT8_MAX

largest positive value a sig_atomic_t can hold.

  #define SIG_ATOMIC_MIN INT8_MIN

smallest negative value a sig_atomic_t can hold.

  #define SIZE_MAX (__CONCAT(INT16_MAX, U))

largest value a size_t can hold.

  #define UINT16_C(value) __CONCAT(value, U)

define a constant of type uint16_t

  #define UINT16_MAX (__CONCAT(INT16_MAX, U) * 2U + 1U)

largest value an uint16_t can hold.

  #define UINT32_C(value) __CONCAT(value, UL)

define a constant of type uint32_t

  #define UINT32_MAX (__CONCAT(INT32_MAX, U) * 2UL + 1UL)

largest value an uint32_t can hold.

  #define UINT64_C(value) __CONCAT(value, ULL)

define a constant of type uint64_t

  #define UINT64_MAX (__CONCAT(INT64_MAX, U) * 2ULL + 1ULL)

largest value an uint64_t can hold.

  #define UINT8_C(value) ((uint8_t) __CONCAT(value, U))

define a constant of type uint8_t

  #define UINT8_MAX (__CONCAT(INT8_MAX, U) * 2U + 1U)

largest value an uint8_t can hold.

  #define UINT_FAST16_MAX UINT16_MAX

largest value an uint_fast16_t can hold.

  #define UINT_FAST32_MAX UINT32_MAX

largest value an uint_fast32_t can hold.

  #define UINT_FAST64_MAX UINT64_MAX

largest value an uint_fast64_t can hold.

  #define UINT_FAST8_MAX UINT8_MAX

largest value an uint_fast8_t can hold.

  #define UINT_LEAST16_MAX UINT16_MAX

largest value an uint_least16_t can hold.

  #define UINT_LEAST32_MAX UINT32_MAX

largest value an uint_least32_t can hold.

  #define UINT_LEAST64_MAX UINT64_MAX

largest value an uint_least64_t can hold.

  #define UINT_LEAST8_MAX UINT8_MAX

largest value an uint_least8_t can hold.

  #define UINTMAX_C(value) __CONCAT(value, ULL)

define a constant of type uintmax_t

  #define UINTMAX_MAX UINT64_MAX

largest value an uintmax_t can hold.

  #define UINTPTR_MAX UINT16_MAX

largest value an uintptr_t can hold.

Typedef Documentation

  typedef signed int int16_t

16-bit signed type.

  typedef signed long int int32_t

32-bit signed type.

  typedef signed long long int int64_t

64-bit signed type.

  typedef signed char int8_t

8-bit signed type.

  typedef int16_t int_fast16_t

fastest signed int with at least 16 bits.

  typedef int32_t int_fast32_t

fastest signed int with at least 32 bits.

  typedef int64_t int_fast64_t

fastest signed int with at least 64 bits.

  typedef int8_t int_fast8_t

fastest signed int with at least 8 bits.

  typedef int16_t int_least16_t

signed int with at least 16 bits.

  typedef int32_t int_least32_t

signed int with at least 32 bits.

  typedef int64_t int_least64_t

signed int with at least 64 bits.

  typedef int8_t int_least8_t

signed int with at least 8 bits.

  typedef int64_t intmax_t

largest signed int available.

  typedef int16_t intptr_t

Signed pointer compatible type.

  typedef unsigned int uint16_t

16-bit unsigned type.

  typedef unsigned long int uint32_t

32-bit unsigned type.

  typedef unsigned long long int uint64_t

64-bit unsigned type.

  typedef unsigned char uint8_t

8-bit unsigned type.

  typedef uint16_t uint_fast16_t

fastest unsigned int with at least 16 bits.

  typedef uint32_t uint_fast32_t

fastest unsigned int with at least 32 bits.

  typedef uint64_t uint_fast64_t

fastest unsigned int with at least 64 bits.

  typedef uint8_t uint_fast8_t

fastest unsigned int with at least 8 bits.

  typedef uint16_t uint_least16_t

unsigned int with at least 16 bits.

  typedef uint32_t uint_least32_t

unsigned int with at least 32 bits.

  typedef uint64_t uint_least64_t

unsigned int with at least 64 bits.

  typedef uint8_t uint_least8_t

unsigned int with at least 8 bits.

  typedef uint64_t uintmax_t

largest unsigned int available.

  typedef uint16_t uintptr_t

Unsigned pointer compatible type.