19. Character Constants

  'c'   for char
 L'c'   for wide char (wchar_t)

where c is a character or escape sequence.

Escape sequences

  \'    single quote
  \"    double quote
  \?    question mark
  \\    backslash
  \a    audible bell
  \b    backspace
  \f    formfeed
  \n    newline
  \r    carriage return
  \t    horizontal tab
  \v    vertical tab

  \ooo  octal escape sequence, e.g. '\0', '\12'

  \x##  hexadecimal escape sequence, e.g. '\xFF'

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C17 (pdf) - 6.4.4 Constants; 6.4.5 String literals