The length of integer type refers to the length of system memory space occupied by integer or long integer.

As far as you are concerned:

Unsigned short integer unsigned double-byte short integer

Short Integer Signed 2 Byte Short Integer -32768 ~ 32767

Unsigned int unsigned 4-byte integer 0 ~ 2 32- 1 (this is correct)

Int 4 byte shaping-231~ 231-1

Int 64 64-bit (8 bytes) shaping-2 63 ~ 2 63- 1 (this is rarely used, usually expressed as high-order int and low-order int, and Bayesian arc now gives its range incorrectly).

I hope it helps you.