The relation and application of int,unsigned int, short in C + +

The type of int is special, and the specific number of bytes is related to the machine word length and compiler. If you want to ensure the portability, try to use __int16 __int32 __int64.
__int16, __int32 This data type allocates the same bytes under all platforms. So there's no problem with the transplant.
The so-called non-portability refers to: when code written on one platform cannot be run on another platform, the desired running result cannot be achieved.
For example: on the 32 platform (so-called 32-bit platform refers to the universal register data width is 32) to write code, the int type is assigned 4 bytes, and the 16-bit platform is the allocation of 2 bytes, then on the 16-bit compiled EXE,
Which is to allocate 2 bytes for int, while running on 32-bit platform, it will be parsed according to 4 bytes, obviously will be wrong!!

For non-int rows, so far, all types of bytes allocated are compatible, that is, different platforms allocate the same number of bytes for the same type!!

Recommendation: Try to avoid using the int type in your code, and substitute short,long,unsigned int for different needs.

Here are the various types of list "Go"

64-bit refers to the data width of the CPU general register is 64 bits.

Data type name	Number of bytes	Alias	Range of values
Int	*	signed,signed int	Determined by the operating system , which is related to the "word length" of the operating system
unsigned int	*	Unsigned	Determined by the operating system, which is related to the "word length" of the operating system
__int8	1	char,signed Char	–128 to 127
__int16	2	Short,short int,signed Short int	–32,768 to 32,767
__int32	4	signed,signed int	–2,147,483,648 to 2,147,483,647
__int64	8	No	–9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
bool	1	No	False or True
Char	1	Signed Char	–128 to 127
unsigned char	1	No	0 to 255
Short	2	Short int,signed Short int	–32,768 to 32,767
unsigned short	2	unsigned short int	0 to 65,535
Long	4	Long int,signed Long int	–2,147,483,648 to 2,147,483,647
Long Long	8	None (but equivalent to __int64)	–9,223,372,036,854,775,808 to 9,223,372,036,854,775,807
unsigned long	4	unsigned long int	0 to 4,294,967,295
Enum	*	No	Determined by the operating system, which is related to the "word length" of the operating system
Float	4	No	3.4E +/-(7 digits)
Double	8	No	1.7E +/-308 (digits)
Long double	8	No	1.7E +/-308 (digits)
wchar_t	2	__wchar_t	0 to 65,535

Type identifier	Type description	Length bytes	Range	Note
Char	Character type	1	-128 ~ 127	-27 ~ (27-1)
unsigned char	No character type	1	0 ~ 255	0 ~ (28-1)
Short int	Short-integer	2	-32768 ~ 32767	2-15 ~ (215-1)
unsigned short int	No character short integer type	2	0 ~ 65535	0 ~ (216-1)
Int	Integral type	4	-2147483648 ~ 2147483647	-231 ~ (231-1)
unsigned int	No-character integer	4	0 ~ 4294967295	0 ~ (232-1)
Float	Real type (single precision)	4	1.18*10-38 ~ 3.40*1038	7-bit significant bit
Double	Real type (double precision)	8	2.23*10-308 ~ 1.79*10308	15-bit significant bit
Long double	Real type (long double precision)	10	3.37*10-4932 ~ 1.18*104932	19-bit significant bit

The relation and application of int,unsigned int, short in C + +