# Language Extensions: Additional Language Features

The following are language extensions that facilitate compatibility with other versions of Fortran:

- DEFINE FILE statement

- ENCODE and DECODE statements

- FIND statement

- The INTERFACE TO statement

- FORTRAN 66 Interpretation of the EXTERNAL statement

- An alternative syntax for the PARAMETER statement

- VIRTUAL statement

- AND, OR, XOR, IMAG, LSHIFT, RSHIFT intrinsics (see the A to Z Reference)

- An alternative syntax for octal and hexadecimal constants

- An alternative syntax for an I/O record specifier

- An alternate syntax for the DELETE statement

- An alternative form for namelist external records

- The integer POINTER statement

- Record structures

Parent topic: Summary of Language Extensions