Manuals / Intel / Computer Equipment / Laptop

Intel fortran-80 manual Relational Expressions

Models: fortran-80

1 130

Download 130 pages 742 b

Page 20

Image 20

FORTRAN Concepts

FORTRAN-80

Fig. 2w$ ·.type,. Length, andJnterpretatbin o~(O~1**QP2)

As these figures indicate, mixed-mode arithmetic is done by converting both operands to the same type (the type of the result) before performing the operation. This conversion is unnecessary when a real number is raised to an integer power.

In the case of an integer divided by another integer, the remainder is truncated.

The value of 1/3 is 0

The value of 8/3 is 2

The value of -8/3 is -2

If the magnitude of an arithmetic result is too large for the processor to represent in the number of bytes shown in these figures, the result is undefined. See section F.I.

2.2.4.3 Relational Expressions

Relational expressions compare two arithmetic or two character expressions and return a TRUE or FALSE result of type logical.

2.2.4.3.1Relational Operators. The relational operators are:

Operator	Meaning
.LT.	Less than
.LE.	Less than or equal
.EQ.	Equal
.NE.	Not equal
.GT.	Greater than
.GE.	Greater than or equal

2-8

Page 20

Image 20

Intel fortran-80 manual Relational Expressions

Contents

Copyright 1978 Intel Corporation FORTRAN-SOPROGRAMMING MANUALManual Order Number: 9800481 A 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 1.1.1 Comment Lines CHAPTER INTRODUCTION TO FORTRAN1.1 An Introductory Example 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:• • • • PROGRAM name 2.1.2 The PROG RAM Statement2.1.3 Statements and Lines 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 = 15/3 + 2 = 15/5 = 2.2.5 Scope of Symbols15/3 + 18/9 = 5 + 2 = 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 Declaratorsary s ,s 3.2.3 Properties of Arrays3.2.4 Referencing Array Elements 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 = expr*c,r*c 3.3.5DATA StatementASSIGN stlTO name 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! nlist3.4.2.2 Named and Blank Common Blocks 3.4.3BLOCK DATA Subprograms3.4.2.1 Common Block Memory Sequence 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 Statement4.2.2 DO Statement 4.2 Loop Control Statements4.2.1 Operation of a DO Loop 4.3 Program Termination Statements 4.2.3CONTINUE Statement4.3.3EN 0 Statement 4.3.1 PAUSE Statement4.3.2 STOP 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 ... = exp156.8 5.1.3.1 Referencing Statement Functions5.1.3.2 Statement Function Limitations 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 Specifier6.2.1.5 File Status Specifier 6.2.1.3 Error Specifier6.2.1.4 File Name Specifier 6.2.1.8 Record Length Specifier 6.2.1.6 Access Method Specifier6.2.1.7 Formatting 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-list6.4.1 Unformatted Data Transfer 6.4Formatted And Unformatted Data Transfer6.3.3 PRINT Statement 6.4.2.2 Format Control 6.4.2 Formatted Data Transfer6.4.2.1 Printing Formatted Records stl FORMAT flist 6.4.3FORMAT Statement6.4.3.t Edit Descriptors 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.2 Statement Summary APPENDIX A FORTRAN-80STATEMENT SUMMARYA.1 Statement Sequence 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 StatementsHollerith Data Type C.3 Hollerith Format SpecificationC.4 AEditing Of Hollerith Data 0.2Nonstandard Extensions To 1977 FORTRAN APPENDIX D EXTENSIONS TO ANSI FORTRAN0.1 Standard Extensions To 1977 Subset 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.3 Unit Preconnection F.2.8 REel Specification For Sequential FilesF.2.9 Flexibility In Standard Restrictions 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