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NAG Fortran Compiler

The NAG Fortran Compiler (derived from the world's first Fortran 90 Compiler which was developed by NAG) is robust, highly tested, and valued by developers all over the globe for its checking capabilities and detailed error reporting. The Compiler is available on a wide range of Unix platforms as well as under Microsoft Windows and it accepts fixed or free format Fortran input and many common Fortran 77 extensions are allowed. A large number of Fortran 2003 language features are now available.

"My programs are much cleaner thanks to the new features in the NAG Fortran Compiler. This may seem like a minor issue, but there are literally hundreds of routines in my programs which pass arrays between them, and simpler interfaces lead to fewer mistakes. It's also useful to be able to write subroutines which decide the size of their return arrays internally, and to have allocatable arrays as structure components."
- Ian Thompson, Research Associate at Loughborough University

Availability

The NAG Fortran Compiler is available now on all major Unix platforms. For users of Microsoft Windows NAG has developed NAG Fortran Builder, a new Integrated Development Environment (IDE) for the NAG Fortran Compiler.

Enhancements at Release 5.2

NAG is pleased to announce that a major new release of the NAG Fortran Compiler - Release 5.2 - is now available. Release 5.2 continues the long line of ever-improving NAG Compilers that started with the world's first Fortran 90 compiler - NAGWare f90 released in 1991.

Release 5.2 continues to support the full Fortran 95 language, whilst retaining backwards compatibility to previous releases. Additional new Fortran 2003 enhancements provide early access to more of the Fortran language of the future. In particular, Release 5.2 now provides a virtually complete implementation of the object oriented language features.

In addition, the new version provides quadruple precision REAL and COMPLEX on all platforms.

Key features of the new release are improvements in performance and error checking.

Now that the Release 5.2 compiler covers the vast majority of Fortran 2003, we've changed its name from "f95" to "nagfor" - the NAG Fortran Compiler.

Major Fortran 2003 features in Release 5.1

• IEEE modules
• PROTECTED attribute
• VALUE attribute
• ALLOCATABLE dummy arrays, function results and structure components.
• Type Extension
• Polymorphic Variables
• Typed allocation
• Type Selection
• Rank-remapping Pointer Assignment
• VOLATILE keyword
• C interoperability
• Type-bound procedures
• Input/output features (various)
• Stream input/output
• Abstract derived types
• Individual component accessibility
• Abstract interfaces and the PROCEDURE statement
• Public entities of private type
• The ISO_FORTRAN_ENV module
• The IMPORT statement
• INTENT for pointers
• Square brackets for array constructors
• The SOURCE= specifier on ALLOCATE
• Error message retrieval (ERRMSG= and IOMSG=)
• Access to the command line and environment variables
• Character kind selection

Additional New Fortran 2003 features in Release 5.2

• Unlimited polymorphic
• Procedure pointers
• Object-bound procedures
• Allocatable scalars
• Deferred character length
• More intrinsic functions in initialisation expressions
• Reallocating assignment
• Recursive I/O
• ASSOCIATE
• MOVE_ALLOC
• New KIND= optional argument to some intrinsics
• CHARACTER argument to some intrinsics
• Type-spec for array constructor
• Asynchronous I/O
• Enhanced complex constants
• Pointer lower bound setting
• Renaming operators on USE
• C_F_PROCPOINTER
• Changes to SYSTEM_CLOCK
• BOZ constants allowed in CMPLX, DBLE, INT and REAL

Online Documentation

The Compiler is accompanied by first-class electronic help guides giving you the detailed information you need to carry out your work quickly and effectively. New at Release 5.2 is a PDF version of the complete compiler manual.

Regular Updates

To ensure that we fulfil your existing and future requirements, the Compiler is regularly updated with new and enhanced features.

Expert Support

If you subscribe to our dedicated Customer Support Service, you will automatically receive any new release that is produced and will have direct access to our experts via the NAG Response Centre, who are there to assist you with your technical queries or difficulties.