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INTTYPES(3) Library Functions Manual INTTYPES(3)

inttypesstandard fixed-size integer types

#include <inttypes.h>

The <inttypes.h> header describes a set of format specifier macros aimed to increase portability both within and across operating systems. It includes the <stdint.h> header and extends it with additional facilities.

Each of the following macros expand to a character string literal containing the format specifier suitable for use within the format argument of a formatted I/O function such as printf(3). Each macro contains an identifier (PRI or SCN), a conversion specifier, and a possible length modifier.

The length modifier follows the integer types described in stdint(3):

int8_t uint8_t
int16_t uint16_t
int32_t uint32_t
int64_t uint64_t
int_least8_t uint_least8_t
int_least16_t uint_least16_t
int_least32_t uint_least32_t
int_least64_t uint_least64_t
int_fast8_t uint_fast8_t
int_fast16_t uint_fast16_t
int_fast32_t uint_fast32_t
int_fast64_t uint_fast64_t
intmax_t uintmax_t
intptr_t uintptr_t

The following format specifiers are defined for the fprintf(3) and fscanf(3) families, respectively:

The available conversion specifiers, “?” in above, are d and i for signed integers and o, u, x, and X for unsigned integers. The X is not available for the fscanf(3) family. Without the length modifier these would correspond with %d, %i, %o, %u, %x, and %X, respectively.

The following example demonstrates typical usage:

uint64_t i = 123;


(void)printf("i = %"PRIu64"\n", i);

printf(3), scanf(3), stdint(3)

The <inttypes.h> header conforms to ISO/IEC 9899:1999 (“ISO C99”) and IEEE Std 1003.1-2001 (“POSIX.1”).

The <inttypes.h> header was first introduced in NetBSD 1.6.

March 21, 2010 NetBSD-7.0.1