Commonly used data types in C51

Types of	symbol	type of data	Keyword	Byte occupied	Occupancy	Represents the range of numbers
Integer	Have	Signed integer	（signed）int	2	16	-32768~32767
		Signed short integer	（signed）short	2	16	-32768~32767
		Signed long integer	（signed）long	4	32	~
	no	Unsigned integer	unsigned int	2	16	0~65535
		Unsigned short	unsigned short int	2	16	0~65535
		Unsigned long	unsigned long int	4	32	0~
Real type	Have	Single precision real	float	4	32	3.4e-38 ~ 3.4e38
	Have	Double precision real	double	8	64	1.7e-308 ~ 1.7e308
Character type	Have	Signed character	char	1	8	-128~127
	no	Unsigned char	unsigned char	1	8	0~255
		Bit type	bit		1	0~1