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Intel fortran-80 manual File-HandlingStatements, OPEN Statement, Unit Specifier, OPEN open-list

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6.2 File-Handling Statements

Input/Output

FORTRAN-SO

6.2 File-Handling Statements

6.2.1 OPEN Statement

The OPEN statement can be used to connect an existing file to a unit, create a preconnected file, create a file and connect it to a unit, or change certain specifiers in the file/unit connection.

The format of the OPEN statement is

OPEN (open-list)

where 'open-list' is a list of specifiers separated by commas. The list of specifiers is:

[UNIT =] unit	U nit specifier
IOSTAT = stname	II0 status speci fier
ERR = st/	Error specifier
FilE = fname	File name specifier
STATUS = stat	File status specifier
ACCESS = aee	Access method specifier
FORM = fmat	Formatting specifier
RECl = ree/en	Record length specifier
BLANK = b/nk	Blank specifier
CARRIAGE::::; car	Carriage control specifier

The unit specifier 'unit' must be present and the unit specified must exist. All other specifiers are optional except that the record length (REeL) must be specified if the file is being connected for direct access. Some specifiers have default values.

The following sections 6.2.1.1 through 6.2.1.10 describe each of the 'open-list' specifiers in detail.

6.2.1.1 Unit Specifier

The format of the unit specifier is

[UNIT =] unit

where 'unit' identifies an external unit. If the optional 'UNIT ='is omitted, the unit specifier must be the first item in 'open-list.'

An external unit identifier must be an integer expression whose value is in the range

0:$unit:$255. Examples:

OPEN (UNIT=3)

OPEN (4)

6.2.1.21/0 Status Specifier

The format of the input/ output status specifier is

IOSTAT = stname

where 'stname' is an integer variable or integer array element name.

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Intel fortran-80 File-HandlingStatements, OPEN Statement, Unit Specifier, 6.2.1.21/0 Status Specifier, OPEN open-list

Contents

Manual Order Number: 9800481 A FORTRAN-SOPROGRAMMING MANUALCopyright 1978 Intel Corporation PRINTED IN U.S.A./A151/1279/5K CP PREFACE Page CONTENTS PREFACE GLOSSARY CHAPTER INTRODUCTION TO FORTRANCHAPTER FORTRAN CONCEPTSILLUSTRATIONS CHAPTER PROGRAMMING GUIDELINESAPPENDIX A FORTRAN-80STATEMENT SUMMARYGLOSSARY Record - A sequence of values or characters 1.1 An Introductory Example CHAPTER INTRODUCTION TO FORTRAN1.1.1 Comment Lines 1.1.2 Type Statement 1.1.3 Input Statements1.1.4 Value Assignment Statement 1.1.5 Output Statements1.2 Summary Of FORTRAN·SO Statements 1.1.6 Program Termination1.2.1 Executable Statements 1.2.2 Nonexecutable Statements1.2.3 Order of Statements FEN:• • • • 2.1.3 Statements and Lines 2.1.2 The PROG RAM StatementPROGRAM name 2.2 FORTRAN Statement Elements 2.2.1 Character Set2.2.2 Constants and Variables ARITHMETICOVERFLOW ERROR MURPHYSLAW FORTRAN-80PNAME AB HITS AVG where+64101 #14010 #4567Q+#AF2CH2.2.4 Expressions and Operators 2.2.4.3 Relational Expressions is evaluated as if it were written 10FLAG = FLAG + IF FLAG1 .EQV. FLAG2 RETURN 15/3 + 18/9 = 5 + 2 = 2.2.5 Scope of Symbols15/3 + 18/9 = 15/3 + 2 = 15/5 = 2.3 Notational Conventions CALL sub arg,argPage CHAPTER DEFINING VARIABLES ARRAYS, AND MEMORY 3.1Type Statements3.1.1 REAL Type Statement 3.1.2 INTEGER Type Statement3.1.3 LOGICAL Type Statement •va,luernustueiA, Qp43.1.4 CHARACTER Type Statement 3.1.5 IMPLICIT StatementCHARACTER * len, name ,name v* len aryd* len3.2 Array Definition 3.2.1 DIMENSION Statement 3.2.2 Kinds of Array Declarators3.2.4 Referencing Array Elements 3.2.3 Properties of Arraysary s ,s 3.3 Assignment Statements DimensionElement Declarator3.3.1 Arithmetic Assignment Statement TYPE OFTYPE OF exp RESULT3.3.2 Logical Assignment Statement 3.3.3Character Assignment Statement3.3.4 ASSIG N Statement v = expASSIGN stlTO name 3.3.5DATA Statementr*c,r*c 3.4.1 EQUIVALENCE Statement 3.4 Memory DefinitionDATA I,J,K/10,20,301 DATA ZEROS 110*0/1,J,K 110,20,301 &NAMES2 IOTTI3.4.2COMMON Statement COMMON /eb! nlist ,/ eb! nlist3.4.2.1 Common Block Memory Sequence 3.4.3BLOCK DATA Subprograms3.4.2.2 Named and Blank Common Blocks 3.4.4 BLOCK DATA Statement CHAPTER 4 PROGRAM EXECUTION CONTROLS 4.1 Transferring Program Oontrol4.1.1 Unconditional GO TO Statement 4.1.2 Computed GO TO StatementGO TO name n, stl ,stl IFexps1,s2,s34.1.3Assigned GO TO Statement 4.1.4Arithmetic IF Statement4.1.5 Logical IF Statement 4.1.6 IF, ELSE IF, and ELSE Blocks4.1.7 Block IF Statement 4.1.8ELSE IF Statement4.1.9 ELSE Statement 4.1.10 END IF Statement4.2.1 Operation of a DO Loop 4.2 Loop Control Statements4.2.2 DO Statement 4.3 Program Termination Statements 4.2.3CONTINUE Statement4.3.2 STOP Statement 4.3.1 PAUSE Statement4.3.3EN 0 Statement CHAPTER FUNCTIONS AND SUBROUTINES 5.1Intrinsic and Statement Functions5.1.1Intrinsic Functions A = 33 + SQRT85.1.2 INTRI NSIC Statement 5.1.3 Statement FunctionsINTRINSIC tunc ,tunc tunc dum ,dum ... = exp5.1.3.2 Statement Function Limitations 5.1.3.1 Referencing Statement Functions156.8 5.2 External Procedures 5.2.1 FUNCTION Statement5.2.1.1 Referencing External Functions typ FUNCTION tunc dum ,dum5.2.2Subroutines 5.2.1.2 FUNCTION Subprogram Limitations~RETURN CA.~END5.2.3 SUBROUTINE Statement 5.2.4 RETU RN Statement5.2.5SAVE Statement 5.2.6EXTERNAL StatementSAVE lebl ,Iebl EXTERNAL proe ,proe5.3 Arguments And Common Blocks Revisited 5.2.7 CALL Statement5.3.1 Common Blocks 5.3.2 Dummy And Actual Arguments5.3.3 Association Of Arguments Functions And Subroutines5.3.3.4 Procedures As Dummy Arguments 5.3.3.1 Agreement Of Argument Lengths5.3.3.2 Variables As Dummy Arguments 5.3.3.3 Arrays As Dummy Arguments5.3.3.5Argument Association Limitations FX, Y,Page CHAPTER INPUT/OUTPUT 6.1Records, Files, And Units6.1.1Record Properties 6.1.2 File Properties6.1.2.1 File Existence 6.1.2.2 File Name6.1.2.3 File Position 6.1.2.4 External And Internal Files6.1.2.5 File Access 6.1.3 Unit Properties6.2 File-HandlingStatements 6.2.1 OPEN Statement6.2.1.1 Unit Specifier 6.2.1.21/0 Status Specifier6.2.1.4 File Name Specifier 6.2.1.3 Error Specifier6.2.1.5 File Status Specifier 6.2.1.7 Formatting Specifier 6.2.1.6 Access Method Specifier6.2.1.8 Record Length Specifier 6.2.1.9 Blank Specifier 6.2.2CLOSE Statement 6.2.1.11 Opening A Connected Unit6.2.2.1 Unit Specifier CLOSE close-list6.2.3 BACKSPACE Statement 6.2.4 REWI N D Statement6.2.2.2 File Disposition Specifier REWI N Darg-list6.3 Data-Transfer 1/0 Statements 6.2.5 ENDFILE Statement6.3.1 READ Statement REWIND REWIND 3, IOSTAT= ERRFLG, ERR=6.3.1.1 Control Information List Examples 6.3.2WRITE Statement 6.3.1.2 Input List6.3.1.3 Implied-DOList WRITE ctl-list out-list6.3.3 PRINT Statement 6.4Formatted And Unformatted Data Transfer6.4.1 Unformatted Data Transfer 6.4.2.1 Printing Formatted Records 6.4.2 Formatted Data Transfer6.4.2.2 Format Control 6.4.3.t Edit Descriptors 6.4.3FORMAT Statementstl FORMAT flist 1 is Ff Edit Descriptor Absolute value of expForm of exp OY1 Y2either a sjgu ora letter indicatingthebas¢ a Z5editdesctiptorExample FS.2 DollytSigfjl$ijitrrrg·6.4.4List·Directed Formatting 6.4.4.1 List-Directed Input6.4.4.2 List-DirectedOutput Page 7.1.1 Problem Definition CHAPTER PROGRAMMING GUIDELINES7.1 Program Development 7.1.2 Program Documentation7.1.3 Refining The Problem Definition 7.1.4 Final Coding 7.2 FORTRAN Coding 7.2.1 Functions And Subroutines7.2.2 GO TO Statement 7.2.3 Crossing Unit Lines7.3 References 7.2.5 RemindersX = 2217*r* *2 PI =1972 A.1 Statement Sequence APPENDIX A FORTRAN-80STATEMENT SUMMARYA.2 Statement Summary ERR = stl ERR = stl FORTRAN-80Statement SummaryDATA Statement Category: Nonexecutable ELSE IF Statement Category: Executable, Block IF EQUIVALENCE Statement FUNCTION Statement Category: Nonexecutable IMPLICIT Statement OPEN Statement fORTRAN-80Statement Summary REWIND Statement SUBROUTINE Statement Category: Executable APPENDIX B INTRINSIC FUNCTIONS B.1 Intrinsic Function SummaryIntrinsic Functions FORTRAN-80<ORM CATEGORYB.2 Notes On Intrinsic Functions Page APPENDIX C HOLLERITH DATA TYPE C.1 Hollerith As A Data TypeC.2 The Hollerith Constant C.2.1 Hollerith Constants In DATA StatementsC.4 AEditing Of Hollerith Data C.3 Hollerith Format SpecificationHollerith Data Type 0.1 Standard Extensions To 1977 Subset APPENDIX D EXTENSIONS TO ANSI FORTRAN0.2Nonstandard Extensions To 1977 FORTRAN 0.3 More Specific Semantics Than 1977 FORTRAN 0.4 Differences From 1966 FORTRANMiscellaneous extensions Seven-dimensionalarrays Page ASCII CODES APPENDIX EPage APPENDIX F 8080/8085 PROCESSOR DEPENDENCIES F.1 Processor Limitations On LanguageF.2 Compiler Extensions LengthF.2.3 Reentrant Procedures F.2.1 Lowercase LettersF.2.2 Port Input/Output F.2.4 Free-formLine FormatF.2.6 Default Data Lengths F.2.5 Interpretation of DO StatementsF.2.7 Including Source Files $0077F.2.9 Flexibility In Standard Restrictions F.2.8 REel Specification For Sequential FilesF.3 Unit Preconnection INDEX Index FREEFORM Compiler Control, F-2 FORTRAN-SO IndexPage NOTES NOTES SOFTWARE PROBLEM REPORT inter111111 BUSINESS REPLY CARDPostage will be paid by Addressee Intel Corporation Attn: Literature DepartmentREQUEST FOR READERSCOMMENTS FORTRAN·80PROGRAMMING MANUAL 9800481 A111111 BUSINESS REPLY CARD0LIKE YOUR COMMENTS Intel Corporation Attn: Literature DepartmentPage inter Printed in U.S.A