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<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.

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   (__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.

fastest signed int with at least 16 bits.

fastest signed int with at least 32 bits.

fastest signed int with at least 64 bits.

Note
This type is not available when the compiler option -mint8 is in effect.

fastest signed int with at least 8 bits.

signed int with at least 16 bits.

signed int with at least 32 bits.

signed int with at least 64 bits.

Note
This type is not available when the compiler option -mint8 is in effect.

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.

fastest unsigned int with at least 16 bits.

fastest unsigned int with at least 32 bits.

fastest unsigned int with at least 64 bits.

Note
This type is not available when the compiler option -mint8 is in effect.

fastest unsigned int with at least 8 bits.

unsigned int with at least 16 bits.

unsigned int with at least 32 bits.

unsigned int with at least 64 bits.

Note
This type is not available when the compiler option -mint8 is in effect.

unsigned int with at least 8 bits.

largest unsigned int available.

Unsigned pointer compatible type.


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