(g77) Language

 
 The GNU Fortran Language
 ************************
 
    GNU Fortran supports a variety of extensions to, and dialects of,
 the Fortran language.  Its primary base is the ANSI FORTRAN 77
 standard, currently available on the network at
 `http://www.fortran.com/fortran/F77_std/rjcnf0001.html' or as
 monolithic text at
 `http://www.fortran.com/fortran/F77_std/f77_std.html'.  It offers some
 extensions that are popular among users of UNIX `f77' and `f2c'
 compilers, some that are popular among users of other compilers (such
 as Digital products), some that are popular among users of the newer
 Fortran 90 standard, and some that are introduced by GNU Fortran.
 
    (If you need a text on Fortran, a few freely available electronic
 references have pointers from `http://www.fortran.com/fortran/Books/'.
 There is a `cooperative net project', `User Notes on Fortran
 Programming' at `ftp://vms.huji.ac.il/fortran/' and mirrors elsewhere;
 some of this material might not apply specifically to `g77'.)
 
    Part of what defines a particular implementation of a Fortran
 system, such as `g77', is the particular characteristics of how it
 supports types, constants, and so on.  Much of this is left up to the
 implementation by the various Fortran standards and accepted practice
 in the industry.
 
    The GNU Fortran *language* is described below.  Much of the material
 is organized along the same lines as the ANSI FORTRAN 77 standard
 itself.
 
     Other Dialects, for information on features `g77' supports
 that are not part of the GNU Fortran language.
 
 work!

 
 Relationship to the ANSI FORTRAN 77 standard:
* Direction of Language Development  Where GNU Fortran is headed.
* Standard Support  Degree of support for the standard.
 
 Extensions to the ANSI FORTRAN 77 standard:
* Conformance
* Notation Used
* Terms and Concepts
* Characters Lines Sequence
* Data Types and Constants
* Expressions
* Specification Statements
* Control Statements
* Functions and Subroutines
* Scope and Classes of Names
* I/O
* Fortran 90 Features

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