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Ascii refers to the American Standard Code for Information Interchange, a standard single-byte character coding scheme that is mainly used to display modern English and other Western European languages. ASCII codes use a specified combination of 7-bit or 8-bit binary numbers to represent 128 or 256 possible characters.

The operating environment of this tutorial: windows7 system, Dell G3 computer.

ASCII ((American Standard Code for Information Interchange): American Standard Code for Information Interchange) is a computer coding system based on the Latin alphabet, mainly used to display modern English and other Western European languages. It is the most general information exchange standard and is equivalent to the international standard ISO/IEC 646.

ASCII codes use a specified combination of 7-bit or 8-bit binary numbers to represent 128 or 256 possible characters. Standard ASCII codes, also known as base ASCII codes, use 7-digit binary numbers (the remaining 1-bit binary is 0) to represent all uppercase and lowercase letters, the numbers 0 to 9, punctuation, and special control characters used in American English. Where:

Control characters: LF (line feed), CR (carriage return), FF (page feed), DEL (delete), BS (backspace), BEL (ring), etc.; communication characters: SOH (header), EOT (tail), ACK (confirmation), etc.; ASCII values of 8, 9, 10 and 13 are converted to backspace, tabulation, line feed and carriage return characters, respectively. They do not have a specific graphical display, but they have different effects on text display depending on the application.

32 '126 (95 total) are characters (32 are spaces), of which 48' 57 is 0 to 9 ten Arabic numerals.

65'90 is 26 capital letters, 97 '122 is 26 lowercase letters, and the rest are punctuation marks, arithmetic symbols and so on.

Also note that in the standard ASCII, the highest bit (b7) is used as the parity bit. The so-called parity is a method used to check whether there is an error in the process of code transmission, which is generally divided into parity and parity. Odd check stipulates that the number of 1 in a byte of correct code must be odd, if it is not odd, add 1 in the highest bit b7; even check stipulates that the number of 1 in a byte of correct code must be even, if not even, then add 1 in the highest bit b7.

The last 128 are called extended ASCII codes. Many x86-based systems support the use of extended (or "high") ASCII. The extended ASCII code allows the 8th bit of each character to be used to determine the additional 128special symbol characters, loanword letters, and graphic symbols.

Size rules:

The size rule of common ASCII codes: 0x9

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