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The latest version of this topic can be found at C Character Constants.
A "character constant" is formed by enclosing a single character from the representable character set within single quotation marks (' '). Character constants are used to represent characters in the execution character set.
Syntax
character-constant:
' c-char-sequence '
L' c-char-sequence '
c-char-sequence:
c-char
c-char-sequence c-char
c-char:
Any member of the source character set except the single quotation mark ('), backslash (\), or newline character
escape-sequence
escape-sequence:
simple-escape-sequence
octal-escape-sequence
hexadecimal-escape-sequence
simple-escape-sequence: one of
\a \b \f \n \r \t \v
\' \" \\ \?
octal-escape-sequence:
\ octal-digit
\ octal-digit octal-digit
\ octal-digit octal-digit octal-digit
hexadecimal-escape-sequence:
\x hexadecimal-digit
hexadecimal-escape-sequence hexadecimal-digit