<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 |
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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 (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) |
Detailed Description
#include <stdint.h>
Since these typedefs are mandated by the C99 standard, they are preferred over rolling your own typedefs.
Macro Definition 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 UINT16_MAX |
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 (INT8_MAX * 2 + 1) |
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 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.
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