(Information is represented by binary on the computer, which makes it difficult for people to understand. Therefore, computers are equipped with input and output devices. The main purpose of these devices is to display information on these devices in a way that people can read for reading and understanding. In order to ensure correct information exchange between people and equipment, equipment and computers, the unified information exchange code prepared by everyone is the ASCII code table, and its full name is "American Standard Code for Information Interchange".)