The standard ASCII code is represented in the computer as one byte, with the highest bit being "0".
In computers, all data must be represented by binary numbers when storing and operating (because computers use high and low levels to represent 1 and 0 respectively), for example, like a, b 52 letters (including uppercase letters) such as , c, and d, as well as numbers such as 0 and 1, as well as some commonly used symbols (such as *, #, @, etc.), are also represented by binary numbers when stored in the computer.
As for which binary numbers are used to represent which symbols, of course everyone can agree on their own set (this is called encoding), and if everyone wants to communicate with each other without causing confusion, then everyone must use The same encoding rules, so the relevant standardization organizations in the United States introduced ASCII encoding, which uniformly stipulates which binary numbers are used to represent the above common symbols.
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