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)