DIGITAL Fortran 90
User Manual for
DIGITAL UNIX Systems

Index
Index
Examples
1-1	Sample Main Program
1-2	Sample Main Program that Uses a Module and Separate Function
1-3	Sample Module
1-4	Sample Separate Function Declaration
4-1	Sample Program SQUARES
4-2	Sample Debugging Session Using Program Squares
5-1	Using the -assume dummy_aliases Option
6-1	Aligned Loop
6-2	Transformed Loop Using Code Replication
6-3	Distributed Loop
6-4	Decomposed Loop Using Locks
6-5	Decomposed Loop Using a Reduction Clause
6-6	Code Using Parallel Region
6-7	Code Using Multiple Threads
6-8	Code Using Multiple Processors
6-9	Code Using Shared Variables
6-10	Code Looking at a Shared Variable Value
7-1	C Function Called by USEROPEN Procedure
7-2	DIGITAL Fortran 90 USEROPEN Main Calling Program
8-1	Error Handling OPEN Statement File Name
11-1	Calling C Functions and Passing Integer Arguments
11-2	Calling C Functions and Passing Integer Arguments
11-3	DIGITAL Fortran 90 Program Calling a DIGITAL Fortran 77 Subroutine
11-4	DIGITAL Fortran 77 Subroutine Called by a DIGITAL Fortran 90 Program
11-5	C Functions Called by a DIGITAL Fortran 90 Program
11-6	Calling C Functions and Passing Integer Arguments
11-7	DIGITAL Fortran 90 Program Calling a C Function
11-8	C Interface Function Called by DIGITAL Fortran 90
11-9	Calling C Functions and Passing Complex Arguments
11-10	Calling C Functions and Passing Pointer Arguments
11-11	C Functions Receiving Pointer Arguments
11-12	C Function That Receives an Explicit-Shape Array
11-13	DIGITAL Fortran 90 Program That Passes an Explicit-Shape Array
12-1	Using the 3f Routine shcom_connect
12-2	Using the 3f Routines irand and qsort
C-1	Sample Source Code Listing
C-2	Sample Machine-Code Listing
C-3	Sample Compilation Summary
Figures
2-1	f90 Driver Program and Software Components
4-1	Example of the Ladebug Graphical Windowing Interface
5-1	Common Block with Unaligned Data
5-2	Common Block with Naturally Aligned Data
5-3	Common Block with Naturally Aligned Reordered Data
5-4	Derived-Type Naturally Aligned Data (in CATALOG_SPRING : ( ,))
5-5	Memory Diagram of REC for Naturally Aligned Records
7-1	Fixed-Length Records
7-2	Variable-Length Records
7-3	Segmented Records
7-4	Stream File
7-5	Stream_CR and Stream_LF Records
9-1	INTEGER (KIND =1) or INTEGER*1 Representation
9-2	INTEGER (KIND =2) or INTEGER*2 Representation
9-3	INTEGER (KIND =4) or INTEGER*4 Representation
9-4	INTEGER (KIND =8) or INTEGER*8 Representation
9-5	LOGICAL Representations
9-6	REAL (KIND =4) or REAL*4 Representation
9-7	REAL (KIND =8) or REAL*8 Representation
9-8	REAL (KIND =16) or REAL*16 Representation
9-9	COMPLEX (KIND =4) or COMPLEX*8 Representation
9-10	COMPLEX (KIND =8) or COMPLEX*16 Representation
9-11	CHARACTER Data Representation
10-1	Little and Big Endian Storage of an INTEGER Value
10-2	Sample Unformatted File Conversion
A-1	VAX F_float REAL (KIND =4) or REAL*4 Representation
A-2	VAX G_float REAL (KIND =8) or REAL*8 Representation
A-3	VAX D_float REAL (KIND =8) or REAL*8 Representation
A-4	VAX F_float COMPLEX (KIND =4) or COMPLEX*8 Representation
A-5	VAX G_float COMPLEX (KIND =8) or COMPLEX*16 Representation
A-6	VAX D_float COMPLEX (KIND =8) or COMPLEX*16 Representation
A-7	VAX H_float REAL*16 Representation (VAX Systems)
Tables
1	Conventions Used in This Document
1-1	Main Tools for Program Development and Testing
2-1	File Suffixes Recognized as Fortran 90 Source Files
2-2	Other File Name Suffixes
2-3	Compiler Limits
2-4	Libraries Automatically Searched When Using the f90 Command
3-1	f90 Command Options and Categories
3-2	Interaction of File Suffix and the -free and -fixed Options on Source Form
3-3	Summary of Floating-Point Exception Command Options
4-1	Summary of Symbol Table Command Options
4-2	Summary of Debugger Commands
5-1	Options Related to Run-Time Performance
5-2	Options that Slow Run-Time Performance
5-3	Output Argument Array Types
5-4	Levels of Optimization with Different -O num Options
6-1	OpenMP Fortran API Compiler Directives
6-2	Initialization Values
6-3	DIGITAL Fortran Parallel Compiler Directives
6-4	OpenMP Fortran API Environment Variables
6-5	DIGITAL Fortran Environment Variables
7-1	Summary of I/O Statements
7-2	Available I/O Statements and Record I/O Forms
7-3	DIGITAL Fortran Record Types
7-4	Preconnected Files and Environment Variables
7-5	OPEN Statement Functions and Specifiers
7-6	Examples of Applying Default Pathnames and File Names
7-7	Implicit DIGITAL Fortran 90 Logical Units
7-8	Allowed Record Access for File Organizations and Record Types
8-1	Severity Levels of Run-Time Messages
8-2	Run-Time Error Messages and Explanations
9-1	DIGITAL Fortran 90 Intrinsic Data Types, Storage, and Numeric Ranges
9-2	Exceptional Floating-Point Numbers
10-1	Unformatted Numeric Formats, Keywords, and Supported Data Types
11-1	Calling Conventions for ATTRIBUTES Options
11-2	C Property and External Names
11-3	C Property and Argument Passing
11-4	DIGITAL Fortran 90 and C Data Types
12-1	Language Interface 3f Library Routines
12-2	3f Library Routines Providing Special Functions
12-3	DIGITAL Fortran 90 3f Functions and Subroutines
12-4	DIGITAL Fortran 90 3hpf HPF_LOCAL_LIBRARY Library Routines
A-1	Summary of Language Compatibility
A-2	Equivalent Record Types for OpenVMS Fortran and DIGITAL Fortran 90 on DIGITAL UNIX Systems
B-1	Compile-Time Environment Variable
B-2	Run-Time Environment Variables
D-1	Operator and Intrinsic Initialization Values