HP Fortran Programmer's Reference

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Execution control 104 Control constructs and statement blocks Flow control statements For a full description of each Fortran 90 control statement, see Chapter 10, “HP Fortran Statements.” For information about the WHERE construct, see “Masked array assignment” on page 99. Chapter 6
Control constructs and statement blocks Execution control Control constructs and statement blocks A control construct consists of a statement block whose execution logic is defined by one of the following control statements: CASE statement DO statement IF statement A statement block is a sequence of statements delimited by a control statements and its corresponding terminal statement. A statement block consists of zero or more statements and can include nested control constructs. However, any nested construct must have its beginning and end within the same statement block. Although the Standard forbids transferring control into a statement block except by means of its control statement, HP Fortran allows it. The Standard does permit the transferring control out of a statement block. For example, the following IF construct contains a GO TO statement that legally transfers control to a label that is defined outside the IF construct: IF (var > 1) THEN var1 = 1 ELSE GO TO 2 END IF ... 2 var1 = var2 The next logical IF statement is nonstandard (but permitted by HP Fortran) because it would transfer control into the DO construct: IF (.NOT.done) GO TO 4 ! nonstandard! ... DO i = 1, 100 sum = b + c 4 b = b + 1 END DO The following sections describe the operations performed by the three control constructs. CASE construct The CASE construct selects (at most) one out of a number of statement blocks for execution. Chapter 6 105
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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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Page 96 and 97: Arrays Array sections ! The arrays
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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
Page 112 and 113: Expressions and assignment Expressi
Page 124 and 125: Expressions and assignment Assignme
Page 134 and 135: Execution control Control construct
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Page 158 and 159: Program units and procedures Extern
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Program units and procedures Proced
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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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