与平台无关的类型,int8_t,uint8_t

pecific 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

上面是一些与平台无关的数据类型，由于在32位机器和64位机器中，long占据不同的字节数，所以推荐使用上面的类型。。上面的类型的头文件是stdint.h