g77.info: Double Quote Meaning

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Meaning of Double Quote

   `g77' treats double-quote (`"') as beginning an octal constant of
`INTEGER(KIND=1)' type when the `-fvxt' option is specified.  The form
of this octal constant is

     "OCTAL-DIGITS

where OCTAL-DIGITS is a nonempty string of characters in the set
`01234567'.

   For example, the `-fvxt' option permits this:

PRINT *, "20 END

The above program would print the value `16'.

   *Note Integer Type::, for information on the preferred construct for
integer constants specified using GNU Fortran's octal notation.

   (In the GNU Fortran language, the double-quote character (`"')
delimits a character constant just as does apostrophe (`'').  There is
no way to allow both constructs in the general case, since statements
like `PRINT *,"2000 !comment?"' would be ambiguous.)