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For example, \n does not represent a backslash followed by the letter n. The backslash escapes the compiler's normal, literal way of interpreting character data. After a backslash, the compiler expects subsequent characters to complete one of the defined escape sequences, and then translates the escape sequence into the characters it represents.
In C and many derivative programming languages, a string escape sequence is a series of two or more characters, starting with a backslash \. [3]Note that in C a backslash immediately followed by a newline does not constitute an escape sequence, but splices physical source lines into logical ones in the second translation phase, whereas string escape sequences are converted in the fifth ...
A Teletype Wheatstone Perforator keyboard from the 1930s, with backslash in the end of the third row Teletype ASR-33 keyboard layout with ASCII character set, prior to June 14, 1966, with backslash on shift+L. As of November 2022, efforts to identify either the origin of this character or its purpose before the 1960s have not been successful.
The backslash (\) escape character typically provides two ways to include double-quotes inside a string literal, either by modifying the meaning of the double-quote character embedded in the string (\" becomes "), or by modifying the meaning of a sequence of characters including the hexadecimal value of a double-quote character (\x22 becomes ").
Select a single character from one of the alternative character sets. SS2 selects the G2 character set, and SS3 selects the G3 character set. [13] In a 7-bit environment, this is followed by one or more GL bytes (0x20–0x7F) specifying a character from that set. [12]: 9.4 In an 8-bit environment, these may instead be GR bytes (0xA0–0xFF).
The basic character set of the C programming language is a subset of the ASCII character set that includes nine characters which lie outside the ISO 646 invariant character set. This can pose a problem for writing source code when the encoding (and possibly keyboard ) being used does not support any of these nine characters.
21-bit Unicode character where ##### is a variable number of hex digits \x## Depends on encoding [b] 8-bit character specification where # is a hex digit. The length of a hex escape sequence is not limited to two digits, instead being of an arbitrary length. [4] \ooo: Depends on encoding [b] 8-bit character specification where o is an octal ...
HTML and XML provide ways to reference Unicode characters when the characters themselves either cannot or should not be used. A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the ...