TOPS-20 PASCAL Language Manual - Bitsavers

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PASCAL DATA TYPES Example T Y PEN d IT! f.~ :;;: {~ F< ~-;; A Y [1.. 30 ::I 0 F C H A F< ~ f' t r' ... T (J .... H :i. t ~:; :::: ,', Hit ~; , H i. t
PASCAL DATA TYPES Example 2 VAR Cit~_Census : PACKED ARRAY [1 •• 25J OF 2500 •• 50000; J : I NTEGEF: i; BEGIN FOI:< I: : :~: :L TO 2~:.:j DO C 1. t ~~ .... C (.:~ n sus I:: I] ! :=: (); END; This example declares the variable City Census as a 25-element array of integer values in the subrange from ~500 through 50000. A value of a is assigned to each element of the array. 2.6 TYPE COMPATIBILITY Type compatibility rules determine the operations and assignments that you can perform with data items of different types. Two scalar types are compatible if their type identifiers are declared equivalent in the TYPE section. In addition, a subrange type is compatible with its base type, and two subranges of the same base type (or equivalent base types) are compatible. For structured and pointer types, PASCAL enforces structural compatibility. Two structured (that is, arrays, records, files, and sets) or pointer types are compatible if their structures are identical. The way PASCAL determines structural compatibility depends types involved. For instance, the requirements for compatibility differ from those for array compatibility. on the record PASCAL uses compatibility rules in the fo]lowing three contexts: 1. Expression compatibility 2. Assignment compatibility 3. Formal and actual parameter compatibility Expression compatibility determines the types of operands you can in an expression. See Chapter 3 for information on expressions. use Assignment compatibility determines the types of values you can assign to variables of each type. Assignment compatibility rules apply to value initializations, assignment statements, and value parameters. Assignment compatibility is described with the assignment statement in Section 5.2. Formal and actual parameter compatibility determines the types of data you can pass in a parameter list. Value parameters follow the rules for assignment compatibility. Variable parameters follow somewhat different rules. Value and variable parameters are described in Chapter 6. 2-29
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 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: PASCAL DATA TYPES Pointer type defi
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:
Page 95 and 96: PROCEDURES AND FUNCTIONS This progr
Page 97 and 98: PROCEDURES AND FUNCTIONS You can al
Page 99 and 100: PROCEDURES AND FUNCTIONS This progr
Page 101 and 102: 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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Page 190 and 191:
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 ""= ::= ,
Page 228 and 229:
-------- ---- ---- ----------------
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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,
Page 256:
- Do Not Tear - Fold Here and Tape
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