Computer encoding (character set) - understand

Why there is a character set, because computers can only process binary data. In order for the computer to recognize human language (0-9, a-z, A-Z, special symbols), we need to "encode" each character. The so-called "encoding" means: each character can be represented by a different binary system.

Assumption: A uses binary to represent 1000, B uses binary to represent 1001

ASCII encoding: use 1 byte (8-bit binary) to represent all characters, a total of 2^8 = 256.

ANSI encoding: Other countries have extended the ASCII encoding to display their own language.

• ANSI under the Chinese operating system, represents gb2312

• ANSI under the traditional operating system, represents big5

• ANSI under the Japanese operating system represents JIS

• ......

• uses 2 bytes (16-bit binary) ( To represent, a total of 2^16 = 65536 characters can be represented.

• ##GB2312 contains a total of 6763 Chinese characters

##GBK encoding: Yes. GB2312 has been expanded to include some unpopular characters, rare characters, ancient Chinese, etc. A total of 21,000 Chinese characters are included.
Unicode encoding. : Plans to uniformly encode all characters in the world, using 4 bytes (32-bit binary) to represent a character

## Its disadvantages: The encoding table file is too large and inconvenient. Use. Use 32-bit binary to represent a character, causing a huge waste of space.

• Assumptions: 1 Use Unicode encoding to represent 0000000000000000000000000000000000000000000001

##UTF-8: Unified conversion format encoding (Multi-language encoding)

Different characters, it will choose the appropriate encoding for translation

For example: 1 You can use ASCII encoding (8-bit binary)#.
• ##"Country" can be represented by 2 bytes