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DO (non-block)DO label [,] index = e1, e2 [, e3]labelindexlabels the last executable statement in the loop (this must not be atransfer of control).is the name of a variable called the DO variable.e1 is an expression which yields an initial value for i.e2 is an expression which yields a final value for i.e3is an optional expression yielding a value specifying the incrementvalue for i. The default for e3 is 1.DescriptionThe DO loop consists of all the executable statements after the specifying DO statement up to andincluding the labeled statement, called the terminal statement. The label is optional. If omitted, theterminal statement of the loop is an END DO statement.Before execution of a DO loop, an iteration count is initialized for the loop. This value is thenumber of times the DO loop is executed, and is:INT((e2-e1+e3)/e3)If the value obtained is negative or zero the loop is not executed.The DO loop is executed first with i taking the value e1, then the value (e1+e3), then the value(e1+e3+e3), etc.It is possible to jump out of a DO loop and jump back in, as long as the do index variable has notbeen adjusted. In a nested DO loop, it is legal to transfer control from an inner loop to an outerloop. It is illegal, however, to transfer into a nested loop from outside the loop.Syntax Extension§Nested DO loops may share the same labeled terminal statement if required. They may not sharean END DO statement.ExamplesDO 100 J = -10,10DO 100 I = -5,5100 SUM = SUM + ARRAY (I,J)76 Chapter 3
DOA(I)=A(I)+1IF (A(I).EQ.4) EXITEND DODO I=1,NA(I)=A(I)+1END DODO WHILE 77The DO WHILE statement introduces a logical do loop and specifies the loop control expression.The DO WHILE statement executes for as long as the logical expression continues to be true whentested at the beginning of each iteration. If expression is false, control transfers to the statementfollowing the loop.SyntaxDO [label[,]] WHILE expressionThe end of the loop is specified in the same way as for an iterative loop, either with a labeledstatement or an END DO.labelexpressionlabels the last executable statement in the loop (this must not be atransfer of control).is a logical expression and label.DescriptionThe logical expression is evaluated. If it is .FALSE., the loop is not entered. If it is .TRUE., theloop is executed once. Then logical expression is evaluated again, and the cycle is repeated untilthe expression evaluates .FALSE.ExampleDO WHILE (K == 0)SUM = SUM + XEND DOFortran Statements 77
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While every precaution has been tak
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Table 6-18: HPF Intrinsics and Libr
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• ISO/IEC 1539 : 1991, Informatio
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non-printing characters, such as TA
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1 Language OverviewThis chapter des
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Table 1-1: Order of StatementsOPTIO
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1.3 Free Form FormattingUsing free
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A continuation line is indicated by
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The following examples are invalid
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Operators of equal rank are evaluat
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1.7.3 Relational ExpressionsA relat
Page 28 and 29: 1.9 Assignment StatementsA Fortran
Page 30 and 31: defined in the character expression
Page 33 and 34: 2 Fortran Data TypesEvery Fortran e
Page 35 and 36: Table 2-3: Data Type ExtensionsType
Page 37 and 38: [s]d 1 d 2 ...d n [ _ kind-paramete
Page 39 and 40: 2.2.5 Complex ConstantsA complex co
Page 41 and 42: CHARACTER(LEN=20) FIRST, LAST, MIDD
Page 43 and 44: 2.4.4 Character SubstringA characte
Page 45 and 46: • A constant is always either 32
Page 47 and 48: STRUCTURE [/structure_name/][field_
Page 49 and 50: RECORD /person/ population(2), me..
Page 51 and 52: BYTE items(12)END MAPEND UNIONEND S
Page 53: declarator, modifying its value dur
Page 56 and 57: 90/95 This statement is either new
Page 58 and 59: ALLOCATE 90The ALLOCATE statement i
Page 60 and 61: DescriptionARRAY can be used in a s
Page 62 and 63: ExamplesBACKSPACE 4BACKSPACE ( UNIT
Page 64 and 65: ExamplesCALL CRASH! no argumentsCAL
Page 66 and 67: Note: The data type of a symbol may
Page 68 and 69: HPFExampleDIMENSION R(10)COMMON /HO
Page 70 and 71: ALL1is an allocatable COMMON block
Page 72 and 73: I = I + H..END SUBROUTINE YEND SUBR
Page 74 and 75: DEALLOCATE 77The DEALLOCATE stateme
Page 76 and 77: See AlsoREAD, PRINTDIMENSION 90The
Page 80 and 81: DOUBLE COMPLEX § 77The DOUBLE COMP
Page 82 and 83: SyntaxIF logical expression THENsta
Page 84 and 85: cfbioserrsis an integer expression
Page 86 and 87: For example:END FILE(20)END FILE(UN
Page 88 and 89: e more than one ENTRY statement wit
Page 90 and 91: EQUIVALENCE 77The EQUIVALENCE state
Page 92 and 93: extrinsic-kind-keyword is the name
Page 94 and 95: if no list items are specified; in
Page 96 and 97: argumentis a symbolic name, startin
Page 98 and 99: ExampleslistASSIGN 50 TO KGO TO K(5
Page 100 and 101: IF (Block) 77The block IF statement
Page 102 and 103: INCLUDE § 77The INCLUDE statement
Page 104 and 105: FILE= finFORM= fmfin is a character
Page 106 and 107: DescriptionWhen an INQUIRE by file
Page 108 and 109: INTEGER, INTENT(OUT)::I1I1=R1END SU
Page 110 and 111: SUBROUTINE TRIG (X,F,Y)Y=F(X)RETURN
Page 112 and 113: Manipulating data using union decla
Page 114 and 115: Using the -I command-line option di
Page 116 and 117: ERR=errsFILE= finFORM=fmcharacter d
Page 118 and 119: ACCESSThe value of 'APPEND' will be
Page 120 and 121: • Case is not significant, unless
Page 122 and 123: The pointer-based variable does not
Page 124 and 125: and is roughly equivalent tocharact
Page 126 and 127: .END MODULETypeNon-executableSee Al
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• Every item whose value is to be
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DescriptionYou create memory storag
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RETURN 77The RETURN statement cause
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line option). Dummy arguments, name
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STRUCTURE § 77The STRUCTURE statem
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argumentis a symbolic name, startin
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Syntax Derived Type DefinitionTYPE
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BYTE num_itemsBYTE items(12)END MAP
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ExamplesINTEGER SCORE(30)CHARACTER
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eal sumsum = 4h()accept sumand is r
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specified with the ":" character ra
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For example:SUBROUTINE YSUM1(M,B,C)
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4.5 CM Fortran Extensions4.5.1 The
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same manner. Direct access files ar
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Table 5-1: OPEN SpecifiersSpecifier
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After data is transferred, the file
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• Repeatable editor commands whic
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On output, the B field descriptor t
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5.5.2.8 G Format ControlThe G forma
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5.5.2.14 O Format Control Octal Val
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The X control specifies a number of
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5.7 List-directed formattingList-di
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Data TypeINTEGER*4INTEGER*8LOGICAL*
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• The value may be constants as a
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Table 6-1: Numeric FunctionsGeneric
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GenericNameIZEXTPurposeZero-ExtendF
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GenericNameREALPurposeConvert toREA
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GenericNamePurposeNumberof ArgsSIN
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GenericNameIANDPurposeLogicalANDNum
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Table 6-5: Fortran 90/95 Bit Manipu
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Table 6-8: Fortran 90/95 Array Redu
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Table 6-10: Fortran 90/95 Array Con
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Generic Name Purpose Numberof ArgsP
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Table 6-17: Miscellaneous Functions
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ArgumentsThe argument STR is the st
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SynopsisALLOCATED(ARRAY)ArgumentThe
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SynopsisASIND(X)ArgumentThe argumen
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ArgumentThe argument X must be of t
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Return ValueReturns a complex numbe
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COUNT 90Return the number of true e
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VALUES(6)VALUES(7)VALUES(8)holds th
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Return ValueThe dot product. For VE
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EXPONENT 90Return the exponent part
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SynopsisIAND(I, J)ArgumentsThe argu
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ArgumentThe arguments I and J must
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INT8 § 77Converts a real value to
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JINT § 77Converts a value to an in
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LEN 90Returns the length of the sup
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LLT 90Test the supplied strings to
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LSHIFT § 77Perform a logical shift
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If the MASK parameter is present, t
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MINLOC 90Return the position of the
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MVBITS 90Copies a bit sequence from
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SynopsisNULL([PTR])ArgumentsThe opt
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Return ValueThe return value is the
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SynopsisREAL(A [,KIND])ArgumentsThe
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ArgumentsThe argument X is of type
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Return ValueThe result is an array
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SIZE 90Returns either the total num
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Return ValueThe return value is the
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TRANSFER 90Return a value that has
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VERIFY 90Verify that a character st
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IntrinsicIALL_SUFFIXIANYIANY_PREFIX
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Return ValueThe shifted array with
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getloghostnmlstatputenvsymlnkttynam
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esyndbesj0dbesj1dbesjndbesy0dbesy1d
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Descriptionctime converts a system
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fgetcGet character from a logical u
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Synopsisinteger function fseek(lu,
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Synopsisinteger function getc(ch)ch
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Synopsisinteger function getuid()De
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isattyIs logical unit a tty.Synopsi
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DescriptionReturn the value which i
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perrorPrint error message.Synopsiss
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DescriptionThe functions rand and i
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DescriptionReturn the index of the
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except lstat returns information ab
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ttynamGet name of a terminalSynopsi
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7.2.2 VAX/VMS System SubroutinesDAT
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destis an integer variable or array
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8 OpenMP Directives for FortranThe
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the parallel region redundantly. Th
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In the presence of an IF clause, th
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!$OMP SINGLE [Clauses]< Fortran cod
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By default, there is an implicit ba
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appear within a parallel region. It
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[!$OMP SECTION]< Fortran code block
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directive. When a common block that
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subroutine omp_unset_lock(integer_v
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9 HPF DirectivesHPF directives are
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ALIGN - REALIGNThe ALIGN directive
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See AlsoThe TEMPLATE and PROCESSORS
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Example!HPF$!HPF$!HPF$!HPF$REAL A(1
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See AlsoFor details on the PROCESSO
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TypeSpecificationSee AlsoFor detail
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IntrinsicGLOBAL_TO_LOCALGLOBAL_UBOU
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Return ValueIf the actual argument
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ArgumentsARRAY may be of any type;
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Return TypeThe result is of type de
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ArgumentsOptional argument. PROC.AR
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IndexABSTRACT_TO_PHYSICAL..........
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DATA ..............................
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GETLOG ............................
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EXP ...............................
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F specifier........................
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LOCAL_UNIDEX.......................
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OpenMP Fortran Directives .........
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DOWHILE ...........................
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FMT specifier......................
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