DIGITAL Fortran 90
User Manual for
DIGITAL UNIX Systems

Chapter 8
8	Run-Time Errors and Signals
8.1	DIGITAL Fortran 90 Run-Time Library Default Error Processing
8.1.1	Run-Time Message Format
8.1.2	Message Catalog Location
8.1.3	Values Returned to the Shell at Program Termination
8.1.4	Forcing a Core Dump for Severe Errors
8.2	Handling Errors
8.2.1	Using the END, EOR, and ERR Branch Specifiers
8.2.2	Using the IOSTAT Specifier
8.2.3	Using the 3f Library Routines to Return Operating System Errors
8.3	Signal Handling
8.4	List of Run-Time Messages
Chapter 9
9	Data Types and Representation
9.1	Summary of Data Types and Characteristics
9.2	Integer Data Representations
9.2.1	Integer Declarations and f90 Options
9.2.2	INTEGER (KIND=1) or INTEGER*1 Representation
9.2.3	INTEGER (KIND=2) or INTEGER*2 Representation
9.2.4	INTEGER (KIND=4) or INTEGER*4 Representation
9.2.5	INTEGER (KIND=8) or INTEGER*8 Representation
9.3	Logical Data Representations
9.4	Native IEEE Floating-Point Representations and Exceptional Values
9.4.1	REAL and COMPLEX Declarations and f90 Options
9.4.2	REAL (KIND=4) or REAL*4 Representation
9.4.3	REAL (KIND=8) or REAL*8 Representation
9.4.4	REAL (KIND=16) or REAL*16 Representation
9.4.5	COMPLEX (KIND=4) or COMPLEX*8 Representation
9.4.6	COMPLEX (KIND=8) or COMPLEX*16 Representation
9.4.7	Exceptional Floating-Point Representations
9.5	Character Representation
9.6	Hollerith Representation
Chapter 10
10	Converting Unformatted Numeric Data
10.1	Endian Order of Numeric Formats
10.2	Native and Supported Nonnative Numeric Formats
10.3	Limitations of Numeric Conversion
10.4	Methods of Specifying the Unformatted Numeric Format
10.4.1	Environment Variable FORT_CONVERTn Method
10.4.2	OPEN Statement CONVERT='keyword' Method
10.4.3	OPTIONS Statement /CONVERT=keyword Method
10.4.4	f90 Command -convert keyword Option Method
10.4.5	Additional Notes on Nonnative Data
Chapter 11
11	Procedure Data Interfaces and Mixed Language Programming
11.1	DIGITAL Fortran 90 Procedures and Argument Passing
11.1.1	Explicit and Implicit Interfaces
11.1.2	Types of DIGITAL Fortran 90 Subprograms
11.1.3	Using Procedure Interface Blocks
11.1.4	Passing Arguments and Function Return Values
11.1.5	Passing Arrays as Arguments
11.1.6	Passing Pointers as Arguments
11.1.7	DIGITAL Fortran 90 Array Descriptor Format
11.1.8	Argument-Passing Mechanisms and Built-In Functions
11.1.8.1	Passing Addresses --- %LOC Function
11.1.8.2	Passing Arguments by Immediate Value --- %VAL Function
11.1.8.3	Passing Arguments by Reference --- %REF Function
11.1.8.4	Examples of Argument Passing Built-in Functions
11.2	Using the cDEC$ ALIAS and cDEC$ ATTRIBUTES Directives
11.2.1	The cDEC$ ALIAS directive
11.2.2	The cDEC$ ATTRIBUTES Directive
11.2.2.1	C Property
11.2.2.2	ALIAS Property
11.2.2.3	REFERENCE and VALUE Properties
11.2.2.4	EXTERN and VARYING Properties
11.3	Calling Between DIGITAL Fortran 77 and DIGITAL Fortran 90
11.3.1	Argument Passing and Function Return Values
11.3.2	Using Data Items in Common Blocks
11.3.3	I/O to the Same Unit Number
11.4	Calling Between DIGITAL Fortran 90 and C
11.4.1	Compiling and Linking Files
11.4.2	Procedures and External Names
11.4.3	Invoking a C Function from DIGITAL Fortran 90
11.4.4	Invoking a DIGITAL Fortran 90 Function or Subroutine from C
11.4.5	Equivalent Data Types for Function Return Values
11.4.6	Argument Association and Equivalent Data Types
11.4.6.1	DIGITAL Fortran 90 Intrinsic Data Types
11.4.6.2	Equivalent DIGITAL Fortran 90 and C Data Types
11.4.7	Example of Passing Integer Data to C Functions
11.4.8	Example of Passing Character Data Between DIGITAL Fortran 90 and C
11.4.9	Example of Passing Complex Data to C Functions
11.4.10	Handling User-Defined Structures
11.4.11	Handling Scalar Pointer Data
11.4.12	Handling Arrays
11.4.13	Handling Common Blocks of Data
11.5	Calling Between Parallel HPF and Non-Parallel HPF Code
Chapter 12
12	DIGITAL Fortran 90 Library Routines
12.1	Reference Pages for the 3f and 3hpf Routines
12.2	EXTERNAL or INTRINSIC Declarations
12.3	Types of DIGITAL Fortran 90 3f Library Routines
12.4	Summary of 3f Library Routines
12.5	Summary of 3hpf HPF_LOCAL_LIBRARY Library Routines
12.6	Example of the 3f Library Routine shcom_connect
12.7	Example of the 3f Library Routines irand and qsort