HP Fortran Programmer's Reference

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Expressions and assignment Expressions j = 3 PRINT *, i .AND. j ! Output from the PRINT statement: 1 The next example shows the use of logical operators to perform bit-masking operations. INTEGER(2) mask2 INTEGER(4) mask4 DATA mask2/ -4 / DATA mask4/Z"ccc2"/ mask4 = mask4 .NEQV. mask2 !set mask4 to Z"ffff333e" mask2 = .NOT. mask4 !set mask2 to Z"ccc1" The next example makes a standard-conforming reference to a bit manipulation intrinsic: INTEGER :: mask = 65535 LOGICAL :: is_even = .FALSE. IF (IAND(mask,1) /= 0) is_even = .TRUE. <strong>HP</strong> <strong>Fortran</strong> allows the following nonstandard version of the preceding example: LOGICAL :: mask = z"ffff" INTEGER :: is_even = .FALSE. IF (IAND(mask,1)) is_even = .TRUE. Operator precedence When an expression expands to operand1 operator1 operand2 operator2 operand3 ... each operator is assigned a precedence. The defined order of evaluation is that any subexpressions containing an operator with higher precedence than the adjacent operators is evaluated first. Where operators are of equal precedence, evaluation is from left to right. The exception to this rule is the exponentiation operator (**), which is evaluated from right to left. Any expression or subexpression may be enclosed in parentheses. These expressions are always evaluated first, using the rules explained above. This usage of parentheses is therefore equivalent to normal mathematical usage. Table 5-2 lists the precedence of the operators, and Table 5-3 gives example expressions that illustrate operator precedence. Table 5-2 Operator precedence Precedence Operators 88 Chapter 5
Table 5-2 Operator precedence (Continued) Highest User defined unary operators . ** . * / . Unary + Unary - . + - . // . .EQ. .NE. .LT. .LE. .GT. .GE. . .NOT. . .AND. . .OR. == /= < >= . .EQV. .NEQV. .XOR. Lowest User-defined binary operators Table 5-3 Examples of operator precedence Expression How evaluated Explanation a+b*c a + (b*c) * has a higher precedence than +. a/b*c (a/b)*c / and * have the same precedence, and evaluation is left to right. a**b**c a**(b**c) ** evaluates right to left. a.AND.b.AND. c.OR.d ((a.AND.b).AND.c). OR.d) Logical operators evaluate left to right. Expressions and assignment Expressions Chapter 5 89
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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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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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