stdint.h: standard integer types(3)
NAME
- <stdint.h>: Standard Integer Types
- 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 - 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)
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.
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.
- Note:
This type is not available when the compiler option -mint8 is in
effect. - 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.
- Note:
This type is not available when the compiler option -mint8 is in
effect. - 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.
- Note:
This type is not available when the compiler option -mint8 is in
effect. - 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.
- Note:
This type is not available when the compiler option -mint8 is in
effect. - 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.
- Note:
This type is not available when the compiler option -mint8 is in
effect. - 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.
- Note:
This type is not available when the compiler option -mint8 is in
effect. - 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.
Author
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