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Sun Microsystems, Inc.

901 San Antonio Road

Palo Alto, CA 94303

U.S.A. 650-960-1300

Send comments about this document to:docfeedback@sun.com

FORTRAN 77 Language Reference

Forte Developer 6 update 2

(Sun WorkShop 6 update 2)

Part No. 806-7986-10

July 2001, Revision A

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DOCUMENTATION IS PROVIDED "AS IS" AND ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,

INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-

INFRINGEMENT, ARE DISCLAIMED, EXCEPT TO THE EXTENT THAT SUCH DISCLAIMERS ARE HELD TO BE LEGALLY INVALID.

Corporation.TousdroitsrŽservŽs.

licencesŽcritesdeSun. Sun f90/f95 est derivŽ de CRAY CF90ª, un produit de Cray Inc.

CETTE PUBLICATIONEST FOURNIEÒEN LÕETATÓETAUCUNEGARANTIE,EXPRESSE OUIMPLICITE, NÕEST ACCORDEE,Y COMPRIS

DES GARANTIES CONCERNANT LA VALEUR MARCHANDE, LÕAPTITUDE DE LA PUBLICATION A REPONDRE A UNE UTILISATION

PARTICULIERE, OU LE FAIT QUÕELLE NE SOIT PAS CONTREFAISANTE DE PRODUIT DE TIERS. CE DENI DE GARANTIE NE

SÕAPPLIQUERAIT PAS, DANS LA MESURE OU IL SERAIT TENU JURIDIQUEMENT NUL ET NON AVENU.

Important Note on New Product

Names As part of SunÕs new developer product strategy, we have changed the names of our development tools from Sun WorkShopª to Forteª Developer products. The products, as you can see, are the same high-quality products you have come to expect from Sun; the only thing that has changed is the name. We believe that the Forteª name blends the traditional quality and focus of SunÕs core programming tools with the multi-platform, business application deployment focus of the Forte tools, such as Forte Fusionª and Forteª for Javaª. The new Forte organization delivers a complete array of tools for end-to-end application development and deployment. For users of the Sun WorkShop tools, the following is a simple mapping of the old product names in WorkShop 5.0 to the new names in Forte Developer 6. In addition to the name changes, there have been major changes to two of the products.

nForte for High Performance Computing contains all the tools formerly found inSun Performance WorkShop Fortran and now includes the C++ compiler, so HighPerformance Computing users need to purchase only one product for all theirdevelopment needs.

nForte Fortran Desktop Edition is identical to the former Sun PerformanceWorkShop Personal Edition, except that the Fortran compilers in that product nolonger support the creation of automatically parallelized or explicit, directive-based parallel code. This capability is still supported in the Fortran compilers inForte for High Performance Computing.

We appreciate your continued use of our development products and hope that we can continue to fulfill your needs into the future.

Old Product Name New Product Name

Sun Visual WorkShop™ C++ Forte™ C++ Enterprise Edition 6

Sun Visual WorkShop™ C++ Personal

EditionForte™ C++ Personal Edition 6

Sun Performance WorkShop™ Fortran Forte™ for High Performance Computing 6

Sun Performance WorkShop™ Fortran

Personal EditionForte™ Fortran Desktop Edition 6

Sun WorkShop Professional™ C Forte™ C 6

Sun WorkShop™ University Edition Forte™ Developer University Edition 6 v

Contents

Before You Begin 1

How This Book Is Organized 1

Typographic Conventions 2

Shell Prompts 3

Supported Platforms 3

Accessing Sun WorkShop Development Tools and Man Pages 4

Accessing Sun WorkShop Documentation 6

Accessing Related Documentation 6

Ordering Sun Documentation 7

Sending Your Comments 7

1. Elements of FORTRAN 9

Standards Conformance 9

Extensions 10

Basic Terms 10

Character Set 10

Symbolic Names 12

Program Units 14

Statements 14

Source Line Formats 15

viFORTRAN 77 Language Reference • July 2001

2. Data Types and Data Items 21

Types 21

CHARACTER24

COMPLEX24

DOUBLE PRECISION25

INTEGER26

LOGICAL27

REAL28

Constants 31

Variables 45

Arrays 46

Substrings 52

@Structures 54 @Pointers 61

3. Expressions 67

Expressions, Operators, and Operands 67

Arithmetic Expressions 68

Character Expressions 74

Logical Expressions 77

Relational Operator 79

Constant Expressions 80

@Record Assignment 81

Evaluation of Expressions 82

4. Statements 83

@ACCEPT84

ASSIGN85

Assignment,v=e87

Contentsvii

@AUTOMATIC92

BACKSPACE94

BLOCK DATA96

@BYTE98

CALL99

CHARACTER103

CLOSE106

COMMON108

COMPLEX110

CONTINUE113

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