Integer Types Range and varieties

Fixed-Width Integer Types (<cstdint> / <stdint.h>)

These are portable and recommended for predictable behavior.

Type	Size	Signed Range	Unsigned Range
int8_t	8 bits	-128 to 127	—
uint8_t	8 bits	—	0 to 255
int16_t	16 bits	-32,768 to 32,767	—
uint16_t	16 bits	—	0 to 65,535
int32_t	32 bits	-2,147,483,648 to 2,147,483,647	—
uint32_t	32 bits	—	0 to 4,294,967,295
int64_t	64 bits	-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807	—
uint64_t	64 bits	—	0 to 18,446,744,073,709,551,615

Standard C++ Integer Types (<limits>)

Type	Typical Size (LP64)	Signed Range	Unsigned Range
char	8 bits	-128 to 127 (if char is signed)	0 to 255 (if char is unsigned)
signed char	8 bits	-128 to 127	—
unsigned char	8 bits	—	0 to 255
short	16 bits	-32,768 to 32,767	0 to 65,535
unsigned short	16 bits	—	0 to 65,535
int	32 bits	-2,147,483,648 to 2,147,483,647	0 to 4,294,967,295
unsigned int	32 bits	—	0 to 4,294,967,295
long	64 bits	-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807	0 to 18,446,744,073,709,551,615
unsigned long	64 bits	—	0 to 18,446,744,073,709,551,615
long long	64 bits	Same as long	Same as unsigned long
unsigned long long	64 bits	—	Same as unsigned long