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Standard library header <stdint.h> (C99)

This header is part of types support library, providing fixed width integer types and a part of numeric limits interface.

Types

For each of the following typedef names marked (optional), an implementation defines it if and only if the implementation provides a corresponding type.

int8_tint16_tint32_tint64_tintN_t

(optional)(optional)(optional)(optional)(optional)

 signed integer type with width of exactly N (typically 8, 16, 32 or 64) bits and no padding bits
(typedef) [edit]

int_fast8_tint_fast16_tint_fast32_tint_fast64_tint_fastN_t

(optional)

 fastest signed integer type with width of at least N (typically 8, 16, 32 or 64) bits
(typedef) [edit]

int_least8_tint_least16_tint_least32_tint_least64_tint_leastN_t

(optional)

 smallest signed integer type with width of at least N (typically 8, 16, 32 or 64) bits
(if intN_t is defined, int_leastN_t designates the same type)
(typedef) [edit]

intmax_t

 maximum-width signed integer type other than a bit-precise integer type(since C23)
(typedef) [edit]

intptr_t

(optional)

 signed integer type other than a bit-precise integer type(since C23) capable of holding a pointer to void
(typedef) [edit]

uint8_tuint16_tuint32_tuint64_tuintN_t

(optional)(optional)(optional)(optional)(optional)

 unsigned integer type with width of exactly N (typically 8, 16, 32 or 64) bits and no padding bits
(typedef) [edit]

uint_fast8_tuint_fast16_tuint_fast32_tuint_fast64_tuint_fastN_t

(optional)

 fastest unsigned integer type with width of at least N (typically 8, 16, 32 or 64) bits
(typedef) [edit]

uint_least8_tuint_least16_tuint_least32_tuint_least64_tuint_leastN_t

(optional)

 smallest unsigned integer type with width of at least N (typically 8, 16, 32 or 64) bits
(if uintN_t is defined, uint_leastN_t designates the same type)
(typedef) [edit]

uintmax_t

 maximum-width unsigned integer type other than a bit-precise integer type(since C23)
(typedef) [edit]

uintptr_t

(optional)

 unsigned integer type other than a bit-precise integer type(since C23) capable of holding a pointer to void
(typedef) [edit]

Macro constants

For each of the following macros marked (conditionally present), an implementation defines it if and only if the implementation defines the corresponding typedef name.

Signed integers : bit width

INTN_WIDTH

(C23)(conditionally present)

 bit width of intN_t (N is typically 8, 16, 32 or 64)
(macro constant) [edit]

INT_FASTN_WIDTH

(C23)(conditionally present)

 bit width of int_fastN_t (N is typically 8, 16, 32 or 64)
(macro constant) [edit]

INT_LEASTN_WIDTH

(C23)(conditionally present)

 bit width of int_leastN_t (N is typically 8, 16, 32 or 64)
(macro constant) [edit]

INTMAX_WIDTH

(C23)

 bit width of intmax_t
(macro constant) [edit]

INTPTR_WIDTH

(C23)(conditionally present)

 bit width of intptr_t
(macro constant) [edit]
Signed integers : minimum value

INTN_MIN

(conditionally present)

 minimum value of intN_t (N is typically 8, 16, 32 or 64)
(macro constant) [edit]

INT_FASTN_MIN

(conditionally present)

 minimum value of int_fastN_t (N is typically 8, 16, 32 or 64)
(macro constant) [edit]

INT_LEASTN_MIN

(conditionally present)

 minimum value of int_leastN_t (N is typically 8, 16, 32 or 64)
(macro constant) [edit]

INTMAX_MIN

 minimum value of intmax_t
(macro constant) [edit]

INTPTR_MIN

(conditionally present)

 minimum value of intptr_t
(macro constant) [edit]
Signed integers : maximum value

INTN_MAX

(conditionally present)

 maximum value of intN_t (N is typically 8, 16, 32 or 64)
(macro constant) [edit]

INT_FASTN_MAX

(conditionally present)

 maximum value of int_fastN_t (N is typically 8, 16, 32 or 64)
(macro constant) [edit]

INT_LEASTN_MAX

(conditionally present)

 maximum value of int_leastN_t (N is typically 8, 16, 32 or 64)
(macro constant) [edit]

INTMAX_MAX

 maximum value of intmax_t
(macro constant) [edit]

INTPTR_MAX

(conditionally present)

 maximum value of intptr_t
(macro constant) [edit]
Unsigned integers : bit width

UINTN_WIDTH

(C23)(conditionally present)

 bit width of uintN_t (N is typically 8, 16, 32 or 64)
(macro constant) [edit]

UINT_FASTN_WIDTH

(C23)(conditionally present)

 bit width of uint_fastN_t (N is typically 8, 16, 32 or 64)
(macro constant) [edit]

UINT_LEASTN_WIDTH

(C23)(conditionally present)

 bit width of uint_leastN_t (N is typically 8, 16, 32 or 64)
(macro constant) [edit]

UINTMAX_WIDTH

(C23)

 bit width of uintmax_t
(macro constant) [edit]

UINTPTR_WIDTH

(C23)(conditionally present)

 bit width of uintptr_t
(macro constant) [edit]
Unsigned integers : maximum value

UINTN_MAX

(conditionally present)

 maximum value of uintN_t (N is typically 8, 16, 32 or 64)
(macro constant) [edit]

UINT_FASTN_MAX

(conditionally present)

 maximum value of uint_fastN_t (N is typically 8, 16, 32 or 64)
(macro constant) [edit]

UINT_LEASTN_MAX

(conditionally present)

 maximum value of uint_leastN_t (N is typically 8, 16, 32 or 64)
(macro constant) [edit]

UINTMAX_MAX

 maximum value of uintmax_t
(macro constant) [edit]

UINTPTR_MAX

(conditionally present)

 maximum value of uintptr_t
(macro constant) [edit]
Characteristics of other integer types

PTRDIFF_WIDTH

(C23)

 bit width of ptrdiff_t
(macro constant) [edit]

PTRDIFF_MIN

 minimum value of ptrdiff_t
(macro constant) [edit]

PTRDIFF_MAX

 maximum value of ptrdiff_t
(macro constant) [edit]

SIZE_WIDTH

(C23)

 bit width of size_t
(macro constant) [edit]

SIZE_MAX

 maximum value of size_t
(macro constant) [edit]

SIG_ATOMIC_WIDTH

(C23)

 bit width of sig_atomic_t
(macro constant) [edit]

SIG_ATOMIC_MIN

 minimum value of sig_atomic_t
(macro constant) [edit]

SIG_ATOMIC_MAX

 maximum value of sig_atomic_t
(macro constant) [edit]

WINT_WIDTH

(C23)

 bit width of wint_t
(macro constant) [edit]

WINT_MIN

 minimum value of wint_t
(macro constant) [edit]

WINT_MAX

 maximum value of wint_t
(macro constant) [edit]

WCHAR_WIDTH

(C23)

 bit width of wchar_t
(macro constant) [edit]

WCHAR_MIN

 minimum value of wchar_t
(macro constant) [edit]

WCHAR_MAX

 maximum value of wchar_t
(macro constant) [edit]

Function macros

For each of the following macros marked (conditionally present), an implementation defines it if and only if the implementation defines the corresponding typedef name.

INTN_C

(conditionally present)

 expands to an integer constant expression of type int_leastN_t, its value is specified by the argument
(function macro) [edit]
expands to an integer constant expression of type intmax_t, its value is specified by the argument
(function macro) [edit]

UINTN_C

(conditionally present)

 expands to an integer constant expression of type uint_leastN_t, its value is specified by the argument
(function macro) [edit]
expands to an integer constant expression of type uintmax_t, its value is specified by the argument
(function macro) [edit]

Synopsis

#define __STDC_VERSION_STDINT_H__ 202311L

// see description of intN_t
typedef /* see description */ int8_t;        // optional
typedef /* see description */ int16_t;       // optional
typedef /* see description */ int32_t;       // optional
typedef /* see description */ int64_t;       // optional
typedef /* see description */ intN_t;        // optional

// see description of int_fastN_t
typedef /* see description */ int_fast8_t;
typedef /* see description */ int_fast16_t;
typedef /* see description */ int_fast32_t;
typedef /* see description */ int_fast64_t;
typedef /* see description */ int_fastN_t;   // optional

// see description of int_leastN_t
typedef /* see description */ int_least8_t;
typedef /* see description */ int_least16_t;
typedef /* see description */ int_least32_t;
typedef /* see description */ int_least64_t;
typedef /* see description */ int_leastN_t;  // optional

typedef /* see description */ intmax_t;
typedef /* see description */ intptr_t;      // optional

// see description of uintN_t
typedef /* see description */ uint8_t;       // optional
typedef /* see description */ uint16_t;      // optional
typedef /* see description */ uint32_t;      // optional
typedef /* see description */ uint64_t;      // optional
typedef /* see description */ uintN_t;       // optional

// see description of uint_fastN_t
typedef /* see description */ uint_fast8_t;
typedef /* see description */ uint_fast16_t;
typedef /* see description */ uint_fast32_t;
typedef /* see description */ uint_fast64_t;
typedef /* see description */ uint_fastN_t;  // optional

// see description of uint_leastN_t
typedef /* see description */ uint_least8_t;
typedef /* see description */ uint_least16_t;
typedef /* see description */ uint_least32_t;
typedef /* see description */ uint_least64_t;
typedef /* see description */ uint_leastN_t; // optional

typedef /* see description */ uintmax_t;
typedef /* see description */ uintptr_t;     // optional

#define INTN_MIN          /* see description */
#define INTN_MAX          /* see description */
#define UINTN_MAX         /* see description */
#define INTN_WIDTH        /* see description */
#define UINTN_WIDTH       /* see description */

#define INT_FASTN_MIN     /* see description */
#define INT_FASTN_MAX     /* see description */
#define UINT_FASTN_MAX    /* see description */
#define INT_FASTN_WIDTH   /* see description */
#define UINT_FASTN_WIDTH  /* see description */

#define INT_LEASTN_MIN    /* see description */
#define INT_LEASTN_MAX    /* see description */
#define UINT_LEASTN_MAX   /* see description */
#define INT_LEASTN_WIDTH  /* see description */
#define UINT_LEASTN_WIDTH /* see description */

#define INTMAX_MIN        /* see description */
#define INTMAX_MAX        /* see description */
#define UINTMAX_MAX       /* see description */
#define INTMAX_WIDTH      /* see description */
#define UINTMAX_WIDTH     /* see description */

#define INTPTR_MIN        /* see description */ // optional
#define INTPTR_MAX        /* see description */ // optional
#define UINTPTR_MAX       /* see description */ // optional
#define INTPTR_WIDTH      /* see description */ // optional
#define UINTPTR_WIDTH     /* see description */ // optional

#define PTRDIFF_MIN       /* see description */
#define PTRDIFF_MAX       /* see description */
#define PTRDIFF_WIDTH     /* see description */
#define SIZE_MAX          /* see description */
#define SIZE_WIDTH        /* see description */

#define SIG_ATOMIC_MIN    /* see description */
#define SIG_ATOMIC_MAX    /* see description */
#define SIG_ATOMIC_WIDTH  /* see description */

#define WCHAR_MIN         /* see description */
#define WCHAR_MAX         /* see description */
#define WCHAR_WIDTH       /* see description */

#define WINT_MIN          /* see description */
#define WINT_MAX          /* see description */
#define WINT_WIDTH        /* see description */

#define INTN_C(value)     /* see description */
#define UINTN_C(value)    /* see description */
#define INTMAX_C(value)   /* see description */
#define UINTMAX_C(value)  /* see description */

Only if the implementation defines __STDC_LIB_EXT1__ and additionally the user code defines __STDC_WANT_LIB_EXT1__ before any inclusion of <stdint.h>: 

#if defined(__STDC_WANT_LIB_EXT1__)
#define RSIZE_MAX /* see description */
#endif