Fastest integer types of at least 8 bits

Names specified here
Name	Description	Notes				Source
`atomic_int_fast8_t`	Atomic integer type		?		T	`<stdatomic.h>`		C11
`atomic_uint_fast8_t`	Atomic integer type		?		T	`<stdatomic.h>`		C11
`INT_FAST8_MAX`	Maximum value of `int_fast8_t`	L		M		`<stdint.h>`	C99	C11
`INT_FAST8_MIN`	Minimum value of `int_fast8_t`	L		M		`<stdint.h>`	C99	C11
`int_fast8_t`	Fastest signed integer type with at least 8 bits	L			T	`<stdint.h>`	C99	C11
`PRIdFAST8`	Decimal output conversion specifier for `int_fast8_t`			M		`<inttypes.h>`	C99	C11
`PRIiFAST8`	Decimal output conversion specifier for `int_fast8_t`			M		`<inttypes.h>`	C99	C11
`PRIoFAST8`	Octal output conversion specifier for `uint_fast8_t`			M		`<inttypes.h>`	C99	C11
`PRIuFAST8`	Decimal output conversion specifier for `uint_fast8_t`			M		`<inttypes.h>`	C99	C11
`PRIXFAST8`	Hexdecimal output conversion specifier for `uint_fast8_t`			M		`<inttypes.h>`	C99	C11
`PRIxFAST8`	Hexdecimal output conversion specifier for `uint_fast8_t`			M		`<inttypes.h>`	C99	C11
`SCNdFAST8`	Decimal input conversion specifier for `int_fast8_t`			M		`<inttypes.h>`	C99	C11
`SCNiFAST8`	General input conversion specifier for `int_fast8_t`			M		`<inttypes.h>`	C99	C11
`SCNoFAST8`	Octal input conversion specifier for `uint_fast8_t`			M		`<inttypes.h>`	C99	C11
`SCNuFAST8`	Decimal input conversion specifier for `uint_fast8_t`			M		`<inttypes.h>`	C99	C11
`SCNxFAST8`	Hexdecimal input conversion specifier for `uint_fast8_t`			M		`<inttypes.h>`	C99	C11
`UINT_FAST8_MAX`	Maximum value of `uint_fast8_t`	L		M		`<stdint.h>`	C99	C11
`uint_fast8_t`	Fastest unsigned integer type with at least 8 bits	L			T	`<stdint.h>`	C99	C11

uint_fast8_t and int_fast8_t are the fastest integer types of at least 8 bits. uint_fast8_t is unsigned, and has the range zero to UINT_FAST8_MAX, which is at least [0, +255]. int_fast8_t is signed, and has the range INT_FAST8_MIN to INT_FAST8_MAX, which is at least [−127, +127].

The following macros can be used in the fmt argument of printf to print arguments of types uint_fast8_t and int_fast8_t:

PRIuFAST8
PRIoFAST8
PRIxFAST8
PRIXFAST8
PRIdFAST8
PRIiFAST8

The following macros can be used in the fmt argument of scanf to scan arguments of types uint_fast8_t * and int_fast8_t *:

SCNuFAST8
SCNoFAST8
SCNxFAST8
SCNdFAST8
SCNiFAST8

atomic_uint_fast8_t is an alias for _Atomic uint_fast8_t. atomic_int_fast8_t is an alias for _Atomic int_fast8_t.

Related types:

uint8_t
int8_t
uint_least8_t
int_least8_t
uint_fast8_t
int_fast8_t

Property		`uint_fast8_t`	`int_fast8_t`
Minimum width (bits)		8
Lowest value		0	≤−127
Highest value		≥+255	≥+127
`printf`	base 10	`"%" PRIuFAST8`	`"%" PRIdFAST8` or `"%" PRIiFAST8`
	base 8	`"%" PRIoFAST8`
	upper-case base 16	`"%" PRIXFAST8`
	lower-case base 16	`"%" PRIxFAST8`
`scanf`	base 10	`"%" SCNuFAST8`	`"%" SCNdFAST8`
	base 8	`"%" SCNoFAST8`
	base 16	`"%" SCNxFAST8`
	base 16, 8 or 10 by prefix		`"%" SCNiFAST8`