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INTTYPES(3) Library Functions Manual 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 ISO/IEC 9899:1999 ("ISO C99") and IEEE Std 1003.1-2001 ("POSIX.1"). HISTORY The <inttypes.h> header was first introduced in NetBSD 1.6. NetBSD 8.0 March 21, 2010 NetBSD 8.0