HP Fortran Programmer's Reference

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Data types and data objects Derived types 1 When do you want to commute: 1. Morning 2. Evening 1 Heavy commute on rte. 128 48 Chapter 3
Pointers Data types and data objects Pointers Pointers in Fortran 90 are more strongly typed than in other languages. While it is true that the Fortran 90 pointer holds the address of another variable (the target), it also holds additional information about the target. For this reason, declaring a pointer requires not only the POINTER attribute but also the type, kind parameter, and (if its target is an array) rank of thetargetitcanpointto. If a pointer is declared as an array with the POINTER attribute, it is an array pointer. As explained in “Deferred-shape arrays” on page 61, the declaration for an array pointer specifies its specifies rank but not the bounds. Following is the declaration of the array pointer ptr: REAL(KIND=16), POINTER, DIMENSION(:,:) :: ptr To become assignable to an array pointer, a target must be declared with the TARGET attribute and must have the same type, kind parameter, and rank as the array pointer. Given the previous declaration of ptr, the following are legal statements: ! declare a target with the same type, kind parameter, and ! rank as ptr REAL(KIND=16), TARGET, DIMENSION(4,3) :: x ... ptr => x ! assign x to ptr in a pointer assignment statement Once the assignment statement executes, you can use either ptr or x to access the same storage, effectively making ptr an alias of x. You can also allocate storage to a pointer by means of the ALLOCATE statement. To deallocate that storage after you are finished with it, use the DEALLOCATE statement. Although allocating storage to a pointer does not involve a target object, the declaration of the pointer must still specify its type, kind parameter, and (if you want to allocate an array) rank. The ALLOCATE statement specifies the bounds for the dimensions. Here is an example of the ALLOCATE statement used to allocate storage for ptr: INTEGER :: j = 10, k = 20 ... ! allocate storage for ptr ALLOCATE (ptr(j,k)) ptr can now be referenced as though it were an array, using Fortran 90 array notation. As an extension, HP Fortran provides the Cray-style pointer variables; for more information, see Chapter 10. For information about aspects of pointers, refer to: “Array pointers” on page 61 for information about allocating array pointers. Chapter 3 49
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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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Page 28 and 29: NOTE Many of these documents are ac
Page 30 and 31: Introduction to HP Fortran 2 Data t
Page 32 and 33: Introduction to HP Fortran HP Fortr
Page 34 and 35: Introduction to HP Fortran HP Fortr
Page 36 and 37: Language elements 8 Lexical tokens
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Page 40 and 41: Language elements Program structure
Page 42 and 43: Language elements Statements Statem
Page 44 and 45: Language elements Source format of
Page 50 and 51: Language elements INCLUDE line 22 C
Page 52 and 53: Data types and data objects 24 Deri
Page 54 and 55: Data types and data objects Intrins
Page 70 and 71: Data types and data objects Derived
Page 78 and 79: Data types and data objects Pointer
Page 80 and 81: Data types and data objects Pointer
Page 82 and 83: Arrays 54 Array declarations Array-
Page 84 and 85: Arrays Array fundamentals a(1,2) a(
Page 86 and 87: Arrays Array declarations For a giv
Page 88 and 89: Arrays Array declarations If a proc
Page 90 and 91: Arrays Array declarations Allocatab
Page 92 and 93: Arrays Array declarations subscript
Page 94 and 95: Arrays Array sections Array section
Page 96 and 97: Arrays Array sections ! The arrays
Page 98 and 99: Arrays Array-valued structure compo
Page 100 and 101: Arrays Array-valued structure compo
Page 102 and 103: Arrays Array constructors depends o
Page 104 and 105: Arrays Array expressions ! the effe
Page 106 and 107: Arrays Array-valued functions PROGR
Page 108 and 109: Arrays Array inquiry intrinsics 80
Page 110 and 111: Expressions and assignment 82 — O
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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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Program units and procedures 122 Te
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Program units and procedures Termin
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Program units and procedures Main p
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Program units and procedures Main p
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Program units and procedures Extern
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Program units and procedures Intern
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Program units and procedures Statem
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Program units and procedures Argume
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Program units and procedures Proced
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Program units and procedures Module
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Program units and procedures Block
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Program units and procedures Block
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I/O and file handling 170 Files Con
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I/O and file handling Files Files A
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I/O and file handling Connecting a
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I/O and file handling Connecting a
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I/O and file handling File access m
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I/O and file handling Nonadvancing
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I/O and file handling I/O statement
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I/O and file handling Syntax of I/O
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I/O and file handling Example progr
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I/O formatting transferring data be
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I/O formatting Format specification
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I/O formatting Edit descriptors Tab
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I/O formatting Edit descriptors del
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I/O formatting Edit descriptors A a
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I/O formatting Edit descriptors 216
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I/O formatting Edit descriptors Qed
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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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