Inttypes.h

The inttypes.h file is a C header file that is part of the C standard library and API. It defines integral types whose sizes are specific and gauranteed. The behavior of the signed and unsigned modifiers upon these types is undefined; use like-size or widening casts within these types instead.

Integral types defined by inttypes.h

Specifier	Signing	Bits	Bytes	Minimum	Maximum
int8_t	Signed	8	1	-128	127
uint8_t	Unsigned	8	1	0	255
int16_t	Signed	16	2	-32 768	32 767
uint16_t	Unsigned	16	2	0	65 535
int32_t	Signed	32	4	-2 147 483 648	2 147 483 647
uint32_t	Unsigned	32	4	0	4 294 967 295
int64_t	Signed	64	8	-9 223 372 036 854 775 808	9 223 372 036 854 775 807
uint64_t	Unsigned	64	8	0	18 446 744 073 709 551 615

See also

• C syntax, the Typical sizes and boundaries of common integral types chart.