The ASCII Character Set
Computers store characters by using a numeric code. The ASCII code (American Standard Code for Information Interchange) is the most commonly used code in the United States. C lets you represent most single characters directly by including the character in single quotation marks, such as ’A’ for the A character. You can also represent a single character by using the octal or hex code preceded by a backslash; for example, ’\012’ and ’\0xa’ both represent the linefeed (LF) character. Such escape sequences can also be part of a string, as in "Hello,\012my dear". When used as a prefix in the following table, the ^ character denotes using the Ctrl key.
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