1 binary bit is called 1 bit, 8 binary bits are called 1 byte, that is, 1 byte (8 bits), and 2 bytes are 1 word (1 word, 16). So it is naturally four times that of word (2 bytes, 0 ~ 2 16- 1), 8 bytes, 0 ~ 2 64- 1). Anything with word (such as dword).

It is unsigned plastic, and the value range is [0,264-1] (almost to 2 * 10 19, so Pascal is nothing big).

The number of bytes occupied is equal to int64, which is equivalent to 2 longint.

In computer data storage, qword is represented by 64-bit binary, and the first bit of int64 is used to store symbols, so it is [-2 63,2 63-1].

Byte/bait/n. [C] is a unit of measurement used by computer information technology to measure storage capacity. Usually, one byte equals eight bits. It also represents data types and language characters in some computer programming languages.