TOPS-20 PASCAL Language Manual - Bitsavers

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PASCAL DATA TYPES Records of differing types are compatible if they meet the following criteria: • They have the same number of fields. • Corresponrling field types are compatible. • Both are packed, or neither is packed, corresponding fields equal bounds. packed. If of subrange the types are types must have The following type is also compatible with Life and Plantlife: TYPE Coords = RECORD X : INTEGER, Y : O •• lOO END; The integer subrange O .. 100 is compatible with the type INTEGER. However, PASCAL does not check for valid assignments to fields of subrange types. If you assign a record of type Life to a record of type Coord, you must ensure that the value of the field Died is within the subrange O .• 100. An out-of-range assignment does not result in an error message. If the records have variants, these criteria also apply: • The records must have the same number of variants. • Corresponding variants must have the same number of fields. • Corresponding field types within corresponding variants must be compa t i bl e. • The case labels associated with the variants must agree in number, but need not agree in value. • Corresponding variants in structurally compatible records must have identical tag constant values. • The tag constant lists in each record must be identical. 2-20
PASCAL DATA TYPES For example, assume the program includes definition: the following TYPE TYPE I ... (::~t~:; Info GT'adps School 'A/ •• /D/;: I
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 10 and 11: • Appendix A lists the various me
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: PASCAL DATA TYPES 2.3.2.2 Assigning
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
Page 65 and 66: CHAPTEH 4 PROGRAM HEADING AND DECLA
Page 67 and 68: PROGRAM HEADING AND DECLARATION SEC
Page 69 and 70: PROGRAM HEADING AND DECLARATION SEC
Page 71: PROGRAM HEADING AND DECLARATION SEC
Page 74 and 75: PASCAL STATEMENTS Simple and compou
Page 76 and 77: PASCAL STATEMENTS Example q Ase~5 :
Page 78 and 79: PASCAL STATEMENTS The objects of th
Page 80 and 81: PASCAL STATEMENTS Example 1 CASE EN
Page 82 and 83: PASCAL STATE~ENTS Example 4 := 1 TO
Page 84 and 85: PASC~L STATEMENTS 5.5 THE WITH STAT
Page 86 and 87: PASCAL STATEMENTS Example FOR I :=
Page 89 and 90: CHAPTER ~ PROCEDURES AND FUNCTIONS
Page 91 and 92: PROCEDURES AND FUNCTIONS Table ~-l:
Page 93 and 94: 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 ~-2:
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PROCEDURES AND FUNCTIONS Table h-3:
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PROCEDURES AND FUNCTIONS Table ~-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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