Data Types in C Language

common definitions of integral types

Implicit specifier(s)	Explicit specifier	Number of bits	Unambiguous type
signed char	same	8	int8_t
unsigned char	same	8	uint8_t
char	one of the above	8	int8_t or uint8_t
short	signed short int	16	int16_t
unsigned short	unsigned short int	16	uint16_t
int	signed int	16 or 32	int16_t or int32_t
unsigned	unsigned int	16 or 32	uint16_t or uint32_t
long	signed long int	32 or 64	int32_t or int64_t
unsigned long	unsigned long int	32 or 64	uint32_t or uint64_t
long long[1]	signed long long int	64	int64_t
unsigned long long[1]	unsigned long long int	64	uint64_t

Specific integral type limits

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