Hello everyone, this is still the longbow
We often hear that programmers must understand binary
So what is binary?
decimal
Before we talk about binary, let's talk about a decimal system that we commonly use, that is, "ten million"
The addition, subtraction, multiplication and division we learn is based on decimal, such as 4+3=7, 9+8=17.
9+8 means every decimal one, which is the essence of decimal.
As the name suggests, binary is every two into one.
binary
Therefore, corresponding to "ten million" in decimal, binary is "0 2 4 8 16" , which is a power function of 2.
For example, the binary representation of 7 is 111, and the binary representation of 155 is 10011011
Octal and Hexadecimal
They are every octal and every hexadecimal, but there is a problem here. The maximum number of decimal units we commonly use is up to 9. How to represent the last few digits of hexadecimal?
It is stipulated to use ABCDEF to represent the last few digits, so if we represent 155 in octal and hexadecimal, respectively.
Octal: 233
Hex: 9b
Today's explanation is here
Later, we will discuss the conversion between bases in detail.
see you later
