TOPS-20 PASCAL Language Manual - Bitsavers

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IN'rRODUCTION The directives FORTRAN, FORWARD, EXTERN, and EXTERNAL are also predeclared by the PASCAL compiler. However, they retain their meanings as directives even if you redefine them as identifiers. 1.2.3.2 User Identifiers - User identifiers denote the names of programs, modules, constants, variables, procedures, functions, and user-defined types. User identifiers name all significant data structures, values, and actions that are not represented by a reserved word, predeclared identifier, or special symbol. 1.2.4 Special Symbols Special symbols represent arithmetic, relational, and set operators, delimiters, and other syntax eJements. PASCAL includes the special symboJs listed in Table 1-3. Table 1-3: Special Symbols Name Symbol Name Symbol Plus sign + Period Equal Multiplication * Not equal Less than < Exponentiation ** Colon Subrange ope ra to r Comma Parentneses ( ) Square brackets I' 1 ( . . ) Comment ( * *) Division Minus sign Greater than / > Less than or
INTRODUCTION The semicolon and the period are the only characters that PASCAL recognizes as delimiters. Spaces, tabs, and carriage-return/line-feed combinations are separators and cannot appear within an identifier, a number, or a special symbol. You must use at least one separator between consecutive identifiers, reserved words, and numbers; but you can use more than one if you want. You could, for instance, put each element of a PASCAL program on a separate line: r-f
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: INTRODUCTION 1.2.3 Identifiers PASC
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
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
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PROGRAM HEADING AND DECLARATION SEC
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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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