fortran reference guide - the portland group fortran reference guide version 2017 | iii chapter 2....

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  • FORTRAN REFERENCE GUIDE

    Version 2017

  • Fortran Reference Guide Version 2017 | ii

    TABLE OF CONTENTS

    Preface............................................................................................................xiv Audience Description.........................................................................................xiv Compatibility and Conformance to Standards........................................................... xiv Organization.................................................................................................... xv Hardware and Software Constraints.......................................................................xvi Conventions.................................................................................................... xvi Related Publications.........................................................................................xvii

    Chapter 1. Language Overview............................................................................... 1 1.1. Elements of a Fortran Program Unit.................................................................. 1

    1.1.1. Fortran Statements................................................................................. 1 1.1.2. Free and Fixed Source............................................................................. 2 1.1.3. Statement Ordering................................................................................. 2

    1.2. The Fortran Character Set.............................................................................. 3 1.3. Free Form Formatting................................................................................... 4 1.4. Fixed Formatting..........................................................................................5

    1.4.1. Column Formatting..................................................................................5 1.4.2. Fixed Format Label Field.......................................................................... 5 1.4.3. Fixed Format Continuation Field................................................................. 5 1.4.4. Fixed Format Statement Field.................................................................... 6 1.4.5. Fixed Format Debug Statements..................................................................6 1.4.6. Tab Formatting.......................................................................................6 1.4.7. Fixed Input File Format Summary................................................................ 6

    1.5.  Include Fortran Source Files............................................................................ 7 1.6. Components of Fortran Statements................................................................... 7

    1.6.1. Symbolic Names..................................................................................... 8 1.7. Expressions.................................................................................................8

    1.7.1. Forming Expressions.................................................................................8 1.7.2. Expression Precedence Rules...................................................................... 9 1.7.3. Arithmetic Expressions............................................................................. 9 1.7.4. Relational Expressions.............................................................................11 1.7.5. Logical Expressions................................................................................ 12 1.7.6. Character Expressions............................................................................. 12 1.7.7. Character Concatenation......................................................................... 12

    1.8. Symbolic Name Scope.................................................................................. 13 1.9. Assignment Statements.................................................................................13

    1.9.1. Arithmetic Assignment............................................................................ 13 1.9.2. Logical Assignment.................................................................................14 1.9.3. Character Assignment............................................................................. 14

    1.10. Listing Controls.........................................................................................15 1.11. OpenMP Directives..................................................................................... 15

  • Fortran Reference Guide Version 2017 | iii

    Chapter 2. Fortran Data Types.............................................................................. 16 2.1.  Intrinsic Data Types..................................................................................... 16

    2.1.1. Kind Parameter..................................................................................... 16 2.1.2. Number of Bytes Specification.................................................................. 17

    2.2. Constants................................................................................................. 19 2.2.1.  Integer Constants.................................................................................. 19 2.2.2. Binary, Octal and Hexadecimal Constants..................................................... 20 2.2.3. Real Constants......................................................................................20 2.2.4. Double Precision Constants.......................................................................21 2.2.5. Complex Constants................................................................................ 21 2.2.6. Double Complex Constants....................................................................... 21 2.2.7. Logical Constants.................................................................................. 21 2.2.8. Character Constants............................................................................... 22 2.2.9. Parameter Constants.............................................................................. 22

    2.3. Structure Constructors................................................................................. 23 2.4. Derived Types............................................................................................ 24 2.5. Deferred Type Parameters............................................................................. 25

    2.5.1. Typed Allocation................................................................................... 25 2.6. Arrays......................................................................................................26

    2.6.1. Array Declaration Element....................................................................... 26 2.6.2. Deferred Shape Arrays............................................................................ 27 2.6.3.  Subscripts............................................................................................27 2.6.4. Character Substring................................................................................27 2.6.5. Array Constructor Syntax......................................................................... 28

    2.7. Fortran Pointers and Targets.......................................................................... 28 2.8. Fortran Binary, Octal and Hexadecimal Constants.................................................28

    2.8.1. Octal and Hexadecimal Constants - Alternate Forms........................................ 29 2.9. Hollerith Constants......................................................................................30 2.10.  Structures............................................................................................... 31

    2.10.1. Records............................................................................................. 32 2.10.2. UNION and MAP Declarations................................................................... 33 2.10.3. Data Initialization................................................................................ 35

    2.11. Pointer Variables....................................................................................... 35 2.11.1. Restrictions........................................................................................ 36 2.11.2. Pointer Assignment............................................................................... 37

    Chapter 3. Fortran Statements.............................................................................. 38 3.1. Statement Format Overview.......................................................................... 38

    3.1.1. Definition of Statement-related Terms.........................................................38 3.1.2. Origin of Statement............................................................................... 39 3.1.3. List-related Notation.............................................................................. 39

    3.2. Fortran Statement Summary Table................................................................... 39 3.3. ACCEPT....................................................................................................44 3.4. ARRAY......................................................................................................45

  • Fortran Reference Guide Version 2017 | iv

    3.5.  BYTE....................................................................................................... 46 3.6. DECODE....................................................................................................47 3.7. DOUBLE COMPLEX........................................................

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