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argumentis a symbolic name, starting with a letter and containing only letters anddigits. The type of argument can be REAL, INTEGER, DOUBLEPRECISION, CHARACTER, COMPLEX, or BYTE, etc.specification-partis the specification of data types for the subroutine.execution-partcontains the subprogram's executable statements.internal-subs-partcontains subprograms defined within the subroutine.DescriptionA SUBROUTINE must be terminated by an END statement. The statements and names in thesubprogram only apply to the subroutine except for subroutine or function references and thenames of COMMON blocks. Dummy arguments may be specified as * which indicates that theSUBROUTINE contains alternate returns.Recursion is allowed if the –Mrecursive option is used on the command-line and the RECURSIVEprefix is included in the function definition.ExampleSUBROUTINE DAXTIM (A, X, Y, N, M, ITER, FP, TOH)INTEGER*4 N, M, ITERREAL*8 A, X(N,M), Y(N,M), FP, TOH...END SUBROUTINE DAXTIMSee AlsoPURE, RECURSIVETARGET 90The TARGET specification statement (attribute) specifies that a data type may be the object of apointer variable (e.g., pointed to by a pointer variable). Likewise, types that do not have theTARGET attribute cannot be the target of a pointer variable.SyntaxTARGET [ :: ] object-name [(array-spec)][, object-name [(array-spec)]]...136 Chapter 3
See AlsoALLOCATABLE, POINTERTHEN 77The THEN statement is part of a block IF statement and surrounds a series of statements that areconditionally executed.SyntaxIF logical expression THENstatementsELSE IF logical expression THENstatementsELSEstatementsENDIFThe ELSE IF section is optional and may be repeated any number of times. Other IF blocks maybe nested within the statements section of an IF block.ExampleIF (I.GT.70) THENM=1ELSE IF (I.LT.5) THENM=2ELSE IF (I.LT.16) THENM=3ENDIFIF (I.LT.15) THENM = 4ELSEM=5ENDIFTYPE 77The TYPE statement begins a derived type data specification or declares variables of a specifieduser-defined type.Syntax Type DeclarationTYPE (type-name) [ , attribute-list :: ] entity-listFortran Statements 137
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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
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1.9 Assignment StatementsA Fortran
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defined in the character expression
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2 Fortran Data TypesEvery Fortran e
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Table 2-3: Data Type ExtensionsType
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[s]d 1 d 2 ...d n [ _ kind-paramete
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2.2.5 Complex ConstantsA complex co
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CHARACTER(LEN=20) FIRST, LAST, MIDD
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2.4.4 Character SubstringA characte
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• A constant is always either 32
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STRUCTURE [/structure_name/][field_
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RECORD /person/ population(2), me..
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BYTE items(12)END MAPEND UNIONEND S
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declarator, modifying its value dur
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90/95 This statement is either new
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ALLOCATE 90The ALLOCATE statement i
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DescriptionARRAY can be used in a s
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ExamplesBACKSPACE 4BACKSPACE ( UNIT
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ExamplesCALL CRASH! no argumentsCAL
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Note: The data type of a symbol may
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HPFExampleDIMENSION R(10)COMMON /HO
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ALL1is an allocatable COMMON block
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I = I + H..END SUBROUTINE YEND SUBR
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DEALLOCATE 77The DEALLOCATE stateme
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See AlsoREAD, PRINTDIMENSION 90The
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DO (non-block)DO label [,] index =
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DOUBLE COMPLEX § 77The DOUBLE COMP
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SyntaxIF logical expression THENsta
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cfbioserrsis an integer expression
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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
Page 128 and 129: • Every item whose value is to be
Page 130 and 131: DescriptionYou create memory storag
Page 132 and 133: RETURN 77The RETURN statement cause
Page 134 and 135: line option). Dummy arguments, name
Page 136 and 137: STRUCTURE § 77The STRUCTURE statem
Page 140 and 141: Syntax Derived Type DefinitionTYPE
Page 142 and 143: BYTE num_itemsBYTE items(12)END MAP
Page 144 and 145: ExamplesINTEGER SCORE(30)CHARACTER
Page 146 and 147: eal sumsum = 4h()accept sumand is r
Page 148 and 149: specified with the ":" character ra
Page 150 and 151: For example:SUBROUTINE YSUM1(M,B,C)
Page 152 and 153: 4.5 CM Fortran Extensions4.5.1 The
Page 154 and 155: same manner. Direct access files ar
Page 156 and 157: Table 5-1: OPEN SpecifiersSpecifier
Page 158 and 159: After data is transferred, the file
Page 160 and 161: • Repeatable editor commands whic
Page 162 and 163: On output, the B field descriptor t
Page 164 and 165: 5.5.2.8 G Format ControlThe G forma
Page 166 and 167: 5.5.2.14 O Format Control Octal Val
Page 168 and 169: The X control specifies a number of
Page 170 and 171: 5.7 List-directed formattingList-di
Page 172 and 173: Data TypeINTEGER*4INTEGER*8LOGICAL*
Page 174 and 175: • The value may be constants as a
Page 176 and 177: Table 6-1: Numeric FunctionsGeneric
Page 178 and 179: GenericNameIZEXTPurposeZero-ExtendF
Page 180 and 181: GenericNameREALPurposeConvert toREA
Page 182 and 183: GenericNamePurposeNumberof ArgsSIN
Page 184 and 185: GenericNameIANDPurposeLogicalANDNum
Page 186 and 187: 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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