HP Fortran Programmer's Reference

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I/O and file handling 170 Files Connecting a file to a unit File access methods Nonadvancing I/O I/O statements Syntax of I/O statements ASA carriage control Example programs Chapter 8
Records I/O and file handling Records The record is the basic unit of Fortran 90 I/O operations. It consists of either characters or binary values, depending upon whether the record is formatted or unformatted. The following sections describe both formatted and unformatted records, plus the special case of the end-of-file record. Note that nonadvancing I/O makes it possible to read and write partial records. For more information, see “Nonadvancing I/O” on page 184. Formatted records A formatted record consists of characters that have been edited during list-directed or namelist-directed I/O, or by a format specification during a data transfer. (For information about format specifications, see “Format specification” on page 204.) The length of a formatted record is measured in characters; there is no predefined maximum limit to the length of a formatted record. Unformatted records An unformatted record consists of binary values in machine-representable format. The length of an unformatted record is measured in bytes. Unformatted records cannot be processed by list-directed or namelist-directed I/O statements or by I/O statements that use format specifications to edit data. End-of-file record The end-of-file record is a special case: it contains no data and is the last record of a sequential file. The end-of-file record is written: By the ENDFILE statement When the file is closed—either explicitly by the CLOSE statement or implicitly when the program terminates—immediately following a write operation When a BACKSPACE statement executes after a write operation, before the file is backspaced If the end-of-file record is encountered during the execution of the READ statement, the program execution will abort unless the READ statement includes the END= specifier, the IOSTAT= specifier, or both. For information about these specifiers, see the description of the READ statement in Chapter 10, “HP Fortran statements,” on page 233. Chapter 8 171
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HP Fortran Programmer’s Reference
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Notice Copyright 1979-2003 Hewlett-
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Contents vi Structurecomponent ....
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Contents viii INTENTattribute......
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Contents x ASSIGN .................
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Contents xii RECORD (extension) ...
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Contents xiv CSHIFT(ARRAY,SHIFT,DIM
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Contents xvi LOC(X)................
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Contents xviii TRANSPOSE(MATRIX)...
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Tables Table9-10.D,E,F,andGeditdesc
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The HP Fortran Programmer’s Refer
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Notational conventions This section
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xxvi Either a or b must be supplied
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NOTE Many of these documents are ac
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Introduction to HP Fortran 2 Data t
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Introduction to HP Fortran HP Fortr
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Introduction to HP Fortran HP Fortr
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Language elements 8 Lexical tokens
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Language elements Lexical tokens Le
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Language elements Program structure
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Language elements Statements Statem
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Language elements Source format of
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Language elements INCLUDE line 22 C
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Data types and data objects 24 Deri
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Data types and data objects Intrins
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Data types and data objects Derived
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Data types and data objects Pointer
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Data types and data objects Pointer
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Arrays 54 Array declarations Array-
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Arrays Array fundamentals a(1,2) a(
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Arrays Array declarations For a giv
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Arrays Array declarations If a proc
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Arrays Array declarations Allocatab
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Arrays Array declarations subscript
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Arrays Array sections Array section
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Arrays Array sections ! The arrays
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Arrays Array-valued structure compo
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Arrays Array-valued structure compo
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Arrays Array constructors depends o
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Arrays Array expressions ! the effe
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Arrays Array-valued functions PROGR
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Arrays Array inquiry intrinsics 80
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Expressions and assignment 82 — O
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Expressions and assignment Expressi
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Expressions and assignment Assignme
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Execution control 104 Control const
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Execution control Control construct
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Execution control Flow control stat
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Page 148 and 149: Execution control Flow control stat
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Page 158 and 159: Program units and procedures Extern
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Page 200 and 201: I/O and file handling Files Files A
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Page 216 and 217: I/O and file handling Syntax of I/O
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Page 232 and 233: I/O formatting Format specification
Page 234 and 235: I/O formatting Edit descriptors Tab
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I/O formatting Edit descriptors Qed
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I/O formatting Edit descriptors Tab
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I/O formatting Edit descriptors O (
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I/O formatting Edit descriptors Inp
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I/O formatting Edit descriptors [r
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I/O formatting Embedded format spec
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I/O formatting Format specification
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HP Fortran statements The following
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HP Fortran statements Attributes Ta
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HP Fortran statements ACCEPT (exten
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HP Fortran statements ALLOCATABLE (
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HP Fortran statements ALLOCATE ALLO
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HP Fortran statements ALLOCATE The
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HP Fortran statements AUTOMATIC (ex
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HP Fortran statements BACKSPACE BAC
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HP Fortran statements BLOCK DATA BL
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HP Fortran statements BUFFER IN (ex
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HP Fortran statements BUFFER OUT (e
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HP Fortran statements BYTE (extensi
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HP Fortran statements CALL 4. Contr
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HP Fortran statements CASE low: For
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HP Fortran statements CHARACTER CHA
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HP Fortran statements CHARACTER 264
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HP Fortran statements CLOSE Descrip
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HP Fortran statements COMMON COMMON
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HP Fortran statements COMMON ! comm
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HP Fortran statements COMPLEX Descr
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HP Fortran statements CONTAINS CONT
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HP Fortran statements CONTINUE CONT
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HP Fortran statements CYCLE Related
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HP Fortran statements DATA 280 Proc
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HP Fortran statements DATA 282 “I
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HP Fortran statements DEALLOCATE Ex
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HP Fortran statements DECODE (exten
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HP Fortran statements DIMENSION (st
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HP Fortran statements DIMENSION (st
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HP Fortran statements DO DO Control
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HP Fortran statements DO DO i = 1,
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HP Fortran statements DOUBLE COMPLE
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HP Fortran statements DOUBLE PRECIS
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HP Fortran statements ELSE ELSE Pro
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HP Fortran statements ELSE IF Relat
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HP Fortran statements ENCODE (exten
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HP Fortran statements ENCODE (exten
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HP Fortran statements END Related s
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HP Fortran statements END (structur
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HP Fortran statements END TYPE END
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HP Fortran statements ENDFILE An en
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HP Fortran statements ENTRY 316 The
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HP Fortran statements ENTRY Here ar
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HP Fortran statements EQUIVALENCE T
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HP Fortran statements EQUIVALENCE C
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HP Fortran statements EXTERNAL (sta
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HP Fortran statements EXTERNAL (sta
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HP Fortran statements FORMAT Relate
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HP Fortran statements FUNCTION Desc
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HP Fortran statements GO TO (comput
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HP Fortran statements IF (arithmeti
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HP Fortran statements IF (logical)
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HP Fortran statements IMPLICIT The
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HP Fortran statements INCLUDE Examp
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HP Fortran statements INQUIRE Table
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HP Fortran statements INQUIRE Relat
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HP Fortran statements INTEGER Descr
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HP Fortran statements INTENT (state
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HP Fortran statements INTENT (state
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HP Fortran statements INTERFACE SUB
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HP Fortran statements INTRINSIC (st
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HP Fortran statements LOGICAL Descr
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HP Fortran statements MAP (extensio
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HP Fortran statements MODULE ... FU
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HP Fortran statements MODULE PROCED
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HP Fortran statements NAMELIST The
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HP Fortran statements NULLIFY Relat
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HP Fortran statements ON (extension
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HP Fortran statements OPEN OPEN Con
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HP Fortran statements OPEN FILE=cha
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HP Fortran statements OPEN Table 10
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HP Fortran statements OPTIONAL (sta
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HP Fortran statements OPTIONAL (sta
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HP Fortran statements PARAMETER (st
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HP Fortran statements PARAMETER (st
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HP Fortran statements PAUSE ! Write
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HP Fortran statements POINTER (Cray
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HP Fortran statements POINTER (stat
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HP Fortran statements POINTER (stat
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HP Fortran statements PRINT Formatt
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HP Fortran statements PRIVATE (stat
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HP Fortran statements PROGRAM PROGR
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HP Fortran statements PUBLIC (state
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HP Fortran statements READ READ Inp
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HP Fortran statements READ IOSTAT=i
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HP Fortran statements READ Namelist
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HP Fortran statements REAL Descript
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HP Fortran statements RECORD (exten
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HP Fortran statements RECORD (exten
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HP Fortran statements RETURN RETURN
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HP Fortran statements REWIND REWIND
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HP Fortran statements SAVE (stateme
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HP Fortran statements SAVE (stateme
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HP Fortran statements SEQUENCE SEQU
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HP Fortran statements STATIC (state
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HP Fortran statements STOP STOP Ter
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HP Fortran statements STRUCTURE (ex
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HP Fortran statements SUBROUTINE SU
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HP Fortran statements TARGET (state
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HP Fortran statements TARGET (state
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HP Fortran statements TASK COMMON (
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HP Fortran statements TYPE (declara
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HP Fortran statements TYPE (definit
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HP Fortran statements TYPE (I/O) (e
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HP Fortran statements USE USE Provi
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HP Fortran statements VIRTUAL (exte
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HP Fortran statements WHERE (statem
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HP Fortran statements WHERE (statem
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HP Fortran statements WRITE WRITE O
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HP Fortran statements WRITE Descrip
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HP Fortran statements WRITE 466 Cha
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Intrinsic procedures The following
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Intrinsic procedures Basic terms an
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Intrinsic procedures Nonstandard in
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Intrinsic procedures Data represent
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Intrinsic procedures Functional cat
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Intrinsic procedures Functional cat
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Intrinsic procedures Intrinsic proc
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BLAS and libU77 libraries The libU7
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BLAS and libU77 libraries Calling l
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BLAS and libU77 libraries Calling l
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BLAS and libU77 libraries libU77 ro
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BLAS and libU77 libraries BLAS rout
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BLAS and libU77 libraries BLAS rout
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I/O runtime error messages INTEGER
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I/O runtime error messages Runtime
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Glossary association association Th
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Glossary construct construct Aserie
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Glossary High Performance Fortran (
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Glossary preconnected preconnected
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Glossary type type See data type. t
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Index arrays, 25 derived types, 45
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Index examples, 96 intrinsic, 95 ma
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Index DSYMV, 621 DSYR, 621 DSYR2, 6
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Index hidden length parameter, 146
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Index statement order, 14 continuat
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Index DFLOTI intrinsics function, 5
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Index in expressions, 93 initializa
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Index statement function, 137 when
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Index assigned GO TO, 115, 331 bloc
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Index HSHFT intrinsics function, 53
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Index PRINT, 397 READ, 406 REWIND,
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Index DATE, 504 date and time intri
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Index KNINT, 565 KNOT, 566 KPACK, 5
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Index ISAMAX routine, 620 ISATTY ro
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Index tape input/output routines, 6
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Index derived types, 450 DO loops,
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Index deallocating, 283 declaring,
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Index REAL statement, 411 type decl
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Index filename extensions, 16 fixed
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Index glossary, 643 modules, 317 st
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Index in expressions, 91, 93 triple
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Index Z Zeditdescriptor, 227 ZABS i
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