Introduction to hexadecimal coding

Introduction to hex

Hexadecimal is a number with 16 A cardinal counting system , This means that each number represents 16 A different number , Rather than 10 In a cardinal system 10 A digital . Systems usually use numbers 0-9 Before presentation 10 position , Then use the letters A-F After 6 position . It is not a historical counting system , But it originated in the electronic age , Because it is a very friendly extension of binary system .
Computers use a simple 2 Binary counting system , Called binary . However , This is quite troublesome for human interaction . Hexadecimal provides a more efficient way to correlate binary values , This is because 16 yes 2 The fourth power of , So a number can be regarded as four binary numbers .

let me put it another way , Any four digit value in binary can be expressed as “ Hexadecimal ” One digit of , The eight digit value in binary can be expressed as two hexadecimal digits , And so on . This is similar to what we usually use base-10 The system forms a contrast , The latter will not match binary digits of any consistent multiple evenly .

Although a larger basic system is used in the calculation , such as base-32 Systems and base-64 System , But hexadecimal is easier for most people to interact , So it is still the most common .Base-32 and base-64 Both have applications in Computing , But they are rarely used anywhere , But for the deepest coding .

Hexadecimal coding table

Code value	character	2 Base number
0	0	0000
1	1	0001
2	2	0010
3	3	0011
4	4	0100
5	5	0101
6	6	0110
7	7	0111
8	8	1000
9	9	1001
10	A	1010
11	B	1011
12	C	1100
13	D	1101
14	E	1110
15	F	1111

Using tools http://www.lzltool.com/hex Hexadecimal can be parsed Online , Convert hex to string or Base64、 or Base64Url Format