INTTYPES(3)

NAME
inttypes - standard fixed-size integer types

SYNOPSIS
#include <inttypes.h>

DESCRIPTION
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:
PRI?8 | SCN?8
PRI?16 | SCN?16
PRI?32 | SCN?32
PRI?64 | SCN?64
PRI?LEAST8 | SCN?LEAST8
PRI?LEAST16 | SCN?LEAST16
PRI?LEAST32 | SCN?LEAST32
PRI?LEAST64 | SCN?LEAST64
PRI?FAST8 | SCN?FAST8
PRI?FAST16 | SCN?FAST16
PRI?FAST32 | SCN?FAST32
PRI?FAST64 | SCN?FAST64
PRI?MAX | SCN?MAX
PRI?PTR | SCN?PTR

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.

EXAMPLES
The following example demonstrates typical usage:

    uint64_t i = 123;
    ...
    (void)printf("i = %"PRIu64"\n", i);

SEE ALSO
printf(3), scanf(3), stdint(3)

STANDARDS
The <inttypes.h> header conforms to isoC-99 and p1003.1-2001.

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