TOPS-20 PASCAL Language Manual - Bitsavers

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PROCEDURES AND FUNCTIONS Table ~-l: Predeclared Procedures (Cont.) Procedure Parameter Type Action READ(f, vl, ... ,vn) READLN(f, vl, ... ,vn) RELEASE(a) RESET(f) REWRITE ( f) UNPACK(z,a,i) f file variable vl, .•. ,vn variables f text file variable vl, ... ,vn variables a a variable type "INTEGER f f f i 1 e variable file variable of z = variable of type PACKED ARRAyru •• vl OF t a = variable of type ARRAY fm .. nl OF T i = starting index in array a For vI through vn, RE~D assigns the next value in the input file f to the variable. You must specify at least one variable (vI). The default for f is INPUT. Performs the READ procedure for vI through vn, then sets the current file position to the beginning of the next line. The variable list is optional. The default or f is INPUT. Deallocates memory allocated by the NEW procedure up to the point set by MARK procedure. the Enables read i ng from file f • RESET (f) moves the current file position to the beginning of file f and assigns the first component of f to the file buffer variable, f ". EOF(f) is set to FALSE unless the file is empty. Enables writing ~o file f. REWRITE(f) sets the file f to zero length and sets EOF (f) to TRUE. Moves (v-u+l) elements from array z to array a by assigning elements z (u] through z (vl to a[i] ari+v-u]. through The upper bound of a must be greater than or equal to (i+v-u). 6-4
PROCEDURES AND FUNCTIONS Table ~-1: Predeclared Procedures (Cont.) Procedure Parameter Type ----------, Action TIME(string) string = variable of type PACKED ARRAY r 1 •• 1 1 1 0 F C HA R WRITE (f ,pI, •.. ,pn) f fUe variable pl, ... ,pn write parameters WRITELN(f,pl, ... ,pn) f tex t: f i 1 e variable pl, ... ,pn w'rite paramE!ters Assigns the current time to string. Writes the values of pI through pn into the file f. At least one parameter (pI) must be specified. The default for f is OUTPUT. Performs the WRITE procedure, then skips to the beginning of the next line. The write parameters are optional. The default for f is OUTPUT. 6.1.1.1 Input/Output Procedures - The <strong>PASCAL</strong> procedures are: input and output • CLOSE - Section 7.4 • FIND - SE'ction 7.5 • GET - Section 7.0 • • OPEN - Section 7.8 • PAGE - Section 7.9 • PUT - Section 7.10 • READ - Section 7.11 • READLN - Section 7.12 • RESET - Section 7.13 • REWRITE - Section 7.14 • WRITE - Section 7.15 LINELIMI'I' - Section 7.7 • WRITELN -, Section 7.16 6-5
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TOPS-20 PASCAL Language Manual AA-L
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CONTENTS PREFACE CHAPTER 1 INTRODUC
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7 • 1 . 1 7 . 1 . 2 7 • 1 . 3 7
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G-l G-2 G-3 G-4 Status of Stack Aft
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• Appendix A lists the various me
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CHAPTER I INTRODUCTION PASCAL-20 is
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PROGRAM Calculator (INPUT, OUTPUT);
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INTRODUCTION 1.1.6 Compilation Unit
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INTRODUCTION 1.2.3 Identifiers PASC
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INTRODUCTION The semicolon and the
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INTRODUCTION In the following examp
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CHAPTER 2 PASCAL DATA TYPES This ch
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PASCAL DATA TYPES In addition to de
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PASCAL DATA TYPES You can use strin
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PASCAL DATA TYPES The base type can
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PASCAL DATA TYPES is BOOLEAN, then
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PASCAL DATA TYPES In the three-dime
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PASCAL DATA TYPES To assign values
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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
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: PROCEDURES AND FUNCTIONS Table ~-l:
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
Page 103 and 104: PROCEDURES AND FUNCTIONS Table ~-2:
Page 105 and 106: PROCEDURES AND FUNCTIONS Table h-3:
Page 107 and 108: PROCEDURES AND FUNCTIONS Table ~-3:
Page 109 and 110: PROCEDURES AND FUNCTIONS Data items
Page 111 and 112: PROCEDURES AND FUNCTIONS The actual
Page 113 and 114: PROCEDURES AND FUNCTIONS An optiona
Page 115 and 116: PROCEDURES AND FUNCTIONS Example 1
Page 117 and 118: PROCEDURES AND FUNCTIONS Fo rma t 1
Page 119 and 120: PROCEDURES AND FUNCTIONS As a resul
Page 121 and 122: PROCEDURES AND FUNCTIONS label sect
Page 123 and 124: PROCEDURES AND FUNCTIONS The functi
Page 125 and 126: PROCEDURES AND FUNrTIONS Example 1
Page 127 and 128: CHAPTER 7 INPUT AND OUTPUT This cha
Page 129 and 130: INPUT AND OUTPUT In executing this
Page 131 and 132: INPUT AND OUTPUT where: file variab
Page 133 and 134: INPUT AND OUTPUT When you reach the
Page 135 and 136: INPUT AND OUTPUT To specify only th
Page 137 and 138: INPUT AND OUTPUT 7.7.4 Record Type
Page 139 and 140: INPUT AND OUTPUT This example cause
Page 141 and 142: 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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