intN_t(3type) — Linux manual page

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON

intN_t(3type)                                              intN_t(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

       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         top

       C11, POSIX.1-2008.

HISTORY         top

       C99, POSIX.1-2001.

       The [U]INTN_WIDTH macros were added in C23.

NOTES         top

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

SEE ALSO         top

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

COLOPHON         top

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Linux man-pages 6.9.1          2024-05-02                  intN_t(3type)

Pages that refer to this page: intmax_t(3type)