TOPS-20 PASCAL Language Manual - Bitsavers

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• Appendix A lists the various messages you can receive. • Appendix B lists the ASCII character set. • Appendix C presents the PASCAL-20 language in the Backus-Naur form and includes syntax diagrams. • Appendix D summarizes the extensions incorporated in the PASCAL-20 language. • Appendix E describes how PASCAL-20 complies with the standard proposed by the International Standardization Organization (ISO) . • Appendix F summarizes the differences between TOPS-20 PASCAL and VAX-li PASCAL. • Appendix G describes the calJing sequences and conventions used by PASCAL for user-defined procedures and functions. ASSOCIATED DOCUMENTS Associated manuals are: • TOPS-20 PASCAL ---- Primer • TOPS-20 ----- User's Guide ---- • • LINK Reference ---- Manual • EDIT Reference Manual ---- • TV Editor Manual x TOPS-20 Commands Reference Manual
CONVENTIONS USED IN THIS DOCUMENT This document uses the foJlowing conventions: Convention Meaning A horizontal preceding item times. ellipsis means can be repeated thnt the one or more A vertical ellipsis means that not all of the statements in a figure or example are shown. [ ] r ] Double brackets in statement and declaration format descriptions enclose optional items, for examp] e: WRITE ([OUTPUT,] print-list) Square brackets show where the syntax requires square brackets. This notation is used with arrays, for example: ARRAyrl •• 5] OF INTEGER { } Braces enclose lists from which you must choose one item, for example: This symbol indicates where you press the RETURN key. UPPERCASE LETTERS The notation indicates that you must press the key labeled CTRL while simultaneously pressing another key (x), for example, . Uppercase letters in a command Jine indicate information that you must enter as shown. lowercase letters Lowercase letters in a command line variable information you supply. indicate Simple_Procedure In programming examples, all identifiers, (names created by the programmer), are printed in lowercase letters with initial capitals. Contrasting Colors Orange - where examples contain both user input and computer output, the characters you type are in orange; the characters printed on the terminal are in black. xi
Page 1 and 2: TOPS-20 PASCAL Language Manual AA-L
Page 3 and 4: CONTENTS PREFACE CHAPTER 1 INTRODUC
Page 5 and 6: 7 • 1 . 1 7 . 1 . 2 7 • 1 . 3 7
Page 7: G-l G-2 G-3 G-4 Status of Stack Aft
Page 13 and 14: CHAPTER I INTRODUCTION PASCAL-20 is
Page 15 and 16: PROGRAM Calculator (INPUT, OUTPUT);
Page 17 and 18: INTRODUCTION 1.1.6 Compilation Unit
Page 19 and 20: INTRODUCTION 1.2.3 Identifiers PASC
Page 21 and 22: INTRODUCTION The semicolon and the
Page 23 and 24: INTRODUCTION In the following examp
Page 25 and 26: CHAPTER 2 PASCAL DATA TYPES This ch
Page 27 and 28: PASCAL DATA TYPES In addition to de
Page 29 and 30: PASCAL DATA TYPES You can use strin
Page 31 and 32: PASCAL DATA TYPES The base type can
Page 33 and 34: PASCAL DATA TYPES is BOOLEAN, then
Page 35 and 36: PASCAL DATA TYPES In the three-dime
Page 37 and 38: PASCAL DATA TYPES To assign values
Page 39 and 40: PASCAL DATA TYPES 2.3.1.5 Array Exa
Page 41 and 42: PASCAL DATA TYPES The fields in thi
Page 43 and 44: PASCAL DATA TYPES 2.3.2.2 Assigning
Page 45 and 46: PASCAL DATA TYPES For example, assu
Page 47 and 48: PASCAL DATA TYPES Sets are compatib
Page 49 and 50: PASCAL DATA TYPES Example 3 F I 1..
Page 51 and 52: PASCAL DATA TYPES Pointer type defi
Page 53: PASCAL DATA TYPES Example 2 VAR Cit
Page 56 and 57: EXPRESSIONS Table 3-1: Arithmetic O
Page 58 and 59: EXPRESSIONS TabJe 1-2: Result Types
Page 60 and 61:
EXPRESSIONS The set operators (+, *
Page 62 and 63:
EXPRESSIONS PROGRAM Level_.O (IN PU
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CHAPTEH 4 PROGRAM HEADING AND DECLA
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PROGRAM HEADING AND DECLARATION SEC
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Page 71:
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PASCAL STATEMENTS Simple and compou
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PASCAL STATEMENTS Example q Ase~5 :
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PASCAL STATEMENTS The objects of th
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PASCAL STATEMENTS Example 1 CASE EN
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PASCAL STATE~ENTS Example 4 := 1 TO
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PASC~L STATEMENTS 5.5 THE WITH STAT
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PASCAL STATEMENTS Example FOR I :=
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CHAPTER ~ PROCEDURES AND FUNCTIONS
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PROCEDURES AND FUNCTIONS Table ~-l:
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PROCEDURES AND FUNCTIONS Table ~-1:
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PROCEDURES AND FUNCTIONS This progr
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PROCEDURES AND FUNCTIONS You can al
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PROCEDURES AND FUNCTIONS This progr
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PROCEDURES AND FUNCTIONS Boolean fu
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PROCEDURES AND FUNCTIONS Table h-3:
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PROCEDURES AND FUNCTIONS Data items
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PROCEDURES AND FUNCTIONS The actual
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PROCEDURES AND FUNCTIONS An optiona
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PROCEDURES AND FUNCTIONS Example 1
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PROCEDURES AND FUNCTIONS Fo rma t 1
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PROCEDURES AND FUNCTIONS As a resul
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PROCEDURES AND FUNCTIONS label sect
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PROCEDURES AND FUNCTIONS The functi
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PROCEDURES AND FUNrTIONS Example 1
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CHAPTER 7 INPUT AND OUTPUT This cha
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INPUT AND OUTPUT In executing this
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INPUT AND OUTPUT where: file variab
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INPUT AND OUTPUT When you reach the
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INPUT AND OUTPUT To specify only th
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INPUT AND OUTPUT 7.7.4 Record Type
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INPUT AND OUTPUT This example cause
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INPUT AND OUTPUT 7.9 THE PUT PROCED
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INPUT AND OUTPUT READ does not read
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INPUT AND OUTPUT This program fragm
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INPUT AND OUTPUT You must call REWR
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INPUT AND OUTPUT The following rule
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INPUT AND OUTPUT This example write
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INPUT l\ND OUTPUT Example 1 BEGIN W
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INPUT AND OUTPUT The first referenc
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USING PASCAL ON TOPS-20 8.2 FILE SP
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USING PASCAL ON TOPS-20 After plann
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USING P~SCAL ON TOPS-20 /TAKE The /
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USING PASCAL ON TOPS-20 If you omit
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USING PASCAL ON TOPS-20 The first c
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• AVERAGE SCORE SOURCE LISTING o
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USING PASCAL ON TOPS-20 The compile
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USING PASCAL ON TOPS-20 8.4.6.3 Cro
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USTNG PASCAL ON TOPS-20 Example 3 f
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PASDDT: THE PASCAL-20 DEBUGGER 9.3
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PASDDT: THE PASCAL-?O DEBUGGER cons
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PASDDT: THE PASCAL-20 DEBUGGER As s
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PASDDT: THE PASCAL-20 DEBUGGER Note
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PASDDT: THE PAS~AL-20 DEBUGGER ]. T
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P~SDDT: THE PASCAL-?O DEBUGGER To r
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._------------- Table A-I: Run-time
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PASCAL MESSAGES -------------------
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PASCAL MESSAGES ? PASOl7 "BEGIN" ex
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PASCAL MESSAGES ? PASIOS Sign not a
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PASCAL MESSAGES ? PAS130 Expression
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PASCAL MESSAGES ? PAS157 Case label
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PASCAL MESSAGES ? PAS184 External p
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PASCAL MESSAGES ? PAS?II Incorrect
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PASCAL MESSAGES ? PAS253 Too many a
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PASCAL MESSAGES % PAS457 Nonstandar
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ASCII CHARACTER SET Table 8-1: The
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APPENDIX C SYNTAX SUMMARY This appe
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SYNTAX Sm1MARY ::= I I I I
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SYNTAX Sur~MARY ::= := ::= I
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SYNTAX SU~1MARY ::= ft ::= ::=
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SYNTAX SUr-1MARY ""= ::= ,
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-------- ---- ---- ----------------
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ISO COMPLIANCE 4. A program paramet
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ISO CO~PLIANCE The DISPOSE procedur
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ISO COMPLIANCE In the UNPACK(z,i. ,
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ISO COMPLIANCE In a FOR statement,
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APPENDIX F DIFFERENCES BETWEEN PASC
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DIFFERENCES BETWEEN PASCAL-20 AND V
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APPENDIX G PROCEDURE AND FUNCTION C
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PROCEDURE AND FUNCTION CALLING SEQU
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PROCEDURE ~ND FUNCTION CALLING SEQU
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INDEX /ABORT switch, 8-7 ABS functi
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Function (Cont.) EOF, 1-7, 6-14 EOL
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INDEX (Co n t. ) Set operator, 1-8,
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- Do Not Tear - Fold Here and Tape
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