intN_t(3type) - Linux manual page (original) (raw)

intNt(3type) intNt(3type)

NAME top

   intN_t, int8_t, int16_t, int32_t, int64_t, uintN_t, uint8_t,
   uint16_t, uint32_t, uint64_t - fixed-width basic integer types

LIBRARY top

   Standard C library (_libc_)

SYNOPSIS top

   **#include <stdint.h>**

   **typedef** /* ... */ **int8_t;**
   **typedef** /* ... */ **int16_t;**
   **typedef** /* ... */ **int32_t;**
   **typedef** /* ... */ **int64_t;**

   **typedef** /* ... */ **uint8_t;**
   **typedef** /* ... */ **uint16_t;**
   **typedef** /* ... */ **uint32_t;**
   **typedef** /* ... */ **uint64_t;**

   **#define INT8_WIDTH   8**
   **#define INT16_WIDTH  16**
   **#define INT32_WIDTH  32**
   **#define INT64_WIDTH  64**

   **#define UINT8_WIDTH  8**
   **#define UINT16_WIDTH 16**
   **#define UINT32_WIDTH 32**
   **#define UINT64_WIDTH 64**

   **#define INT8_MAX** /*  2**(INT8_WIDTH - 1) - 1   */
   **#define INT16_MAX** /*  2**(INT16_WIDTH - 1) - 1  */
   **#define INT32_MAX** /*  2**(INT32_WIDTH - 1) - 1  */
   **#define INT64_MAX** /*  2**(INT64_WIDTH - 1) - 1  */

   **#define INT8_MIN** /*  - 2**(INT8_WIDTH - 1)     */
   **#define INT16_MIN** /*  - 2**(INT16_WIDTH - 1)    */
   **#define INT32_MIN** /*  - 2**(INT32_WIDTH - 1)    */
   **#define INT64_MIN** /*  - 2**(INT64_WIDTH - 1)    */

   **#define UINT8_MAX** /*  2**INT8_WIDTH - 1         */
   **#define UINT16_MAX** /*  2**INT16_WIDTH - 1        */
   **#define UINT32_MAX** /*  2**INT32_WIDTH - 1        */
   **#define UINT64_MAX** /*  2**INT64_WIDTH - 1        */

   **#define INT8_C(**_c_**)** _c_ **##** /* ... */
   **#define INT16_C(**_c_**)** _c_ **##** /* ... */
   **#define INT32_C(**_c_**)** _c_ **##** /* ... */
   **#define INT64_C(**_c_**)** _c_ **##** /* ... */

   **#define UINT8_C(**_c_**)** _c_ **##** /* ... */
   **#define UINT16_C(**_c_**)** _c_ **##** /* ... */
   **#define UINT32_C(**_c_**)** _c_ **##** /* ... */
   **#define UINT64_C(**_c_**)** _c_ **##** /* ... */

DESCRIPTION top

   _int_N__t_ are signed integer types of a fixed width of exactly N
   bits, _N_ being the value specified in its type name.  They are be
   capable of storing values in the range [**INT**_N_**_MIN**, **INT**_N_**_MAX**],
   substituting _N_ by the appropriate number.

   _uint_N__t_ are unsigned integer types of a fixed width of exactly N
   bits, N being the value specified in its type name.  They are
   capable of storing values in the range [**0**, **UINT**_N_**_MAX**],
   substituting _N_ by the appropriate number.

   According to POSIX, [_u_]_int8t_, [_u_]_int16t_, and [_u_]_int32t_ are
   required; [_u_]_int64t_ are only required in implementations that
   provide integer types with width 64; and all other types of this
   form are optional.

   The macros [**U**]**INT**_N_**_WIDTH** expand to the width in bits of these
   types (_N_).

   The macros [**U**]**INT**_N_**_MAX** expand to the maximum value that these
   types can hold.

   The macros **INT**_N_**_MIN** expand to the minimum value that these types
   can hold.

   The macros [**U**]**INT**_N_**_C**() expand their argument to an integer
   constant of type [_u_]_int_N__t_.

   The length modifiers for the [_u_]_int_N__t_ types for the [printf(3)](../man3/printf.3.html)
   family of functions are expanded by macros of the forms **PRId**_N_,
   **PRIi**_N_, **PRIu**_N_, and **PRIx**_N_ (defined in _<inttypes.h>_); resulting for
   example in **%"PRId64"** or **%"PRIi64"** for printing _int64t_ values.
   The length modifiers for the [_u_]_int_N__t_ types for the [scanf(3)](../man3/scanf.3.html)
   family of functions are expanded by macros of the forms **SCNd**_N_,
   **SCNi**_N_, **SCNu**_N_, and **SCNx**_N,_ (defined in _<inttypes.h>_); resulting for
   example in **%"SCNu8"** or **%"SCNx8"** for scanning _uint8t_ values.

STANDARDS top

   C11, POSIX.1-2008.

HISTORY top

   C99, POSIX.1-2001.

   The [**U**]**INT**_N_**_WIDTH** macros were added in C23.

NOTES top

   The following header also provides these types: _<inttypes.h>_.
   _<arpa/inet.h>_ also provides _uint16t_ and _uint32t_.

SEE ALSO top

   [intmax_t(3type)](../man3/intmax%5Ft.3type.html), [intptr_t(3type)](../man3/intptr%5Ft.3type.html), [printf(3)](../man3/printf.3.html)

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Linux man-pages 6.10 2024-05-02 intNt(3type)

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