Rules for C++ string literals escape character

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Control characters:

(Hex codes assume an ASCII-compatible character encoding.)

  • \a = \x07 = alert (bell)
  • \b = \x08 = backspace
  • \t = \x09 = horizonal tab
  • \n = \x0A = newline (or line feed)
  • \v = \x0B = vertical tab
  • \f = \x0C = form feed
  • \r = \x0D = carriage return
  • \e = \x1B = escape (non-standard GCC extension)

Punctuation characters:

  • \" = quotation mark (backslash not required for '"')
  • \' = apostrophe (backslash not required for "'")
  • \? = question mark (used to avoid trigraphs)
  • \\ = backslash

Numeric character references:

  • \ + up to 3 octal digits
  • \x + any number of hex digits
  • \u + 4 hex digits (Unicode BMP, new in C++11)
  • \U + 8 hex digits (Unicode astral planes, new in C++11)

\0 = \00 = \000 = octal ecape for null character

If you do want an actual digit character after a \0, then yes, I recommend string concatenation. Note that the whitespace between the parts of the literal is optional, so you can write "\0""0".

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