intN_t(3type)                                                    intN_t(3type)

NAME
       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
       Standard C library (libc)

SYNOPSIS
       #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
       intN_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 [INTN_MIN, INTN_MAX], substituting N by the
       appropriate number.

       uintN_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, UINTN_MAX], substituting N by the
       appropriate number.

       According to POSIX, [u]int8_t, [u]int16_t, and [u]int32_t are required;
       [u]int64_t are only required in implementations that provide integer
       types with width 64; and all other types of this form are optional.

       The macros [U]INTN_WIDTH expand to the width in bits of these types
       (N).

       The macros [U]INTN_MAX expand to the maximum value that these types can
       hold.

       The macros INTN_MIN expand to the minimum value that these types can
       hold.

       The macros [U]INTN_C() expand their argument to an integer constant of
       type [u]intN_t.

       The length modifiers for the [u]intN_t types for the printf(3) family
       of functions are expanded by macros of the forms PRIdN, PRIiN, PRIuN,
       and PRIxN (defined in <inttypes.h>); resulting for example in %"PRId64"
       or %"PRIi64" for printing int64_t values.  The length modifiers for the
       [u]intN_t types for the scanf(3) family of functions are expanded by
       macros of the forms SCNdN, SCNiN, SCNuN, and SCNxN, (defined in
       <inttypes.h>); resulting for example in %"SCNu8" or %"SCNx8" for
       scanning uint8_t values.

STANDARDS
       C11, POSIX.1-2008.

HISTORY
       C99, POSIX.1-2001.

       The [U]INTN_WIDTH macros were added in C23.

NOTES
       The following header also provides these types: <inttypes.h>.
       <arpa/inet.h> also provides uint16_t and uint32_t.

SEE ALSO
       intmax_t(3type), intptr_t(3type), printf(3)

Linux man-pages 6.7               2023-10-31                     intN_t(3type)