Certain non-graphic characters, the single quote '
, the double quote "
the question mark ?
and the backslash
, can be represented according to
The double quote "
and the question mark ?
, can be
represented as themselves or by the escape sequences
the single quote '
and the backslash \
shall be represented by the escape sequences \'
Escape sequences in
which the character following the backslash is not listed in
are conditionally-supported, with
An escape sequence specifies a single