Octal

 You can use this type of constant wherever numeric constants are
 allowed; it assumes a numeric data type according to its context.

 An octal constant has one of these forms:

   O'd[...d]'
   O"d[...d]"

   d   Is an octal (base 8) digit in the range 0 - 7.

 You can specify up to 128 bits in octal (43 octal digits)
 constants.  Leading zeros are ignored.