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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | STANDARDS | HISTORY | NOTES | SEE ALSO | COLOPHON |
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intN_t(3type) intN_t(3type)
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
Standard C library (libc)
#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 ## /* ... */
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.
C11, POSIX.1-2008.
C99, POSIX.1-2001.
The [U]INTN_WIDTH macros were added in C23.
The following header also provides these types: <inttypes.h>.
<arpa/inet.h> also provides uint16_t and uint32_t.
intmax_t(3type), intptr_t(3type), printf(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.15 2025-05-17 intN_t(3type)
Pages that refer to this page: intmax_t(3type)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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