9.6.1 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'.

See 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.)