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When the above code is compiled and executed, it produces the following result: Enter the file name: contact.txt Completed writing Appending to a File Appending to a file means writing to an existing file that already has some data without overwriting the file. The following program illustrates this: program exAppendfile; var myfile: text; info: string; begin assign(myfile, 'contact.txt'); append(myfile); writeln('Contact Details'); writeln('webmaster@tutorialspoint.com'); close(myfile); (* let us read from this file *) assign(myfile, 'contact.txt'); reset(myfile); while not eof(myfile) do begin readln(myfile, info); writeln(info); end; close(myfile); end. When the above code is compiled and executed, it produces the following result: Contact Details webmaster@tutorialspoint.com Note to Students: For details information on Pascal Programming Contact: Tutorials Point File Handling Functions Free Pascal provides the following functions/procedures for file handling: TUTORIALS POINT Simply Easy Learning Page 118
S.N. Function Name & Description 1 procedure Append( var t: Text ); Opens a file in append mode 2 procedure Assign( out f: file; const Name: ); Assigns a name to a file 3 procedure Assign( out f: file; p: PChar ); Assigns a name to a file 4 procedure Assign( out f: file; c: Char ); Assign a name to a file 5 procedure Assign( out f: TypedFile; const Name: ); Assigns a name to a file 6 procedure Assign( out f: TypedFile; p: PChar ); Assigns a name to a file 7 procedure Assign( out f: TypedFile; c: Char ); Assigns a name to a file 8 procedure Assign( out t: Text; const s: ); Assigns a name to a file 9 procedure Assign( out t: Text; p: PChar ); Assigns a name to a file 10 procedure Assign( out t: Text; c: Char ); Assigns a name to a file 11 procedure BlockRead( var f: file; var Buf; count: Int64; var Result: Int64 ); Reads data from a file into memory 12 procedure BlockRead( var f: file; var Buf; count: LongInt; var Result: LongInt ); Reads data from a file into memory 13 procedure BlockRead( var f: file; var Buf; count: Cardinal; var Result: Cardinal ); TUTORIALS POINT Simply Easy Learning Page 119
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Pascal Tutorial
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ABOUT THE TUTORIAL Pascal Tutorial
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Declaring Constants ...............
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Accessing Two-Dimensional Array Ele
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CHAPTER 1 Pascal Overview This chap
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CHAPTER 2 Environment This section
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Name and version of text editor can
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Pascal Hello World Example Followin
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CHAPTER 4 Basic Syntax You have see
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The Pascal character set consists o
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Type Declarations: The type declara
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Subrange Types Subrange types allow
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Pascal programming language also al
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Enumerated Variables You have seen
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CHAPTER 7 Constants This section sh
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CHAPTER 8 Operators This section sh
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Checks if the value of left operand
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When the above code is compiled and
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program beBitwise; var a, b, c: int
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CHAPTER 9 Decision Making This sect
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Example: Let us try a complete exam
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Example: Let us try a complete exam
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Nested if-then Statements It is alw
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The following rules apply to a case
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Flow Diagram: Example: The followin
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CHAPTER 10 Loops This section shows
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Flow Diagram: Here, key point of th
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Flow Diagram Example: program forLo
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Example: program repeatUntilLoop; v
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Example: program exBreak; var a: in
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Example: program exContinue; var a:
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Example: The following program illu
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Defining a Function: In Pascal, a f
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variable named m. The variable m is
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program exRecursion; var num, f: in
Page 75 and 76: procedure swap(x, y: integer); var
Page 77 and 78: When the above code is compiled and
Page 79 and 80: Now, let us extend the program litt
Page 81 and 82: Let us change the previous example
Page 85 and 86: 12 function AnsiStrLower( Str: PCha
Page 87 and 88: CHAPTER 15 Boolean This section sho
Page 89 and 90: CHAPTER 16 Arrays This section show
Page 91 and 92: Initializing Arrays In Pascal, arra
Page 93 and 94: Two-Dimensional Arrays: The simples
Page 95 and 96: The following example declares and
Page 97 and 98: Passing Arrays as Subprogram Argume
Page 99 and 100: Following are some valid pointer de
Page 101 and 102: To check for a nil pointer, you can
Page 103 and 104: program exPointers; const MAX = 3;
Page 105 and 106: program exPointers; const MAX = 3;
Page 107 and 108: Value of num = 3000 Value available
Page 109 and 110: CHAPTER 18 Records This section sho
Page 111 and 112: (* book 2 specification *) Book2.ti
Page 113 and 114: type record-ptr = ^ record-name; re
Page 115 and 116: (* book 1 specification *) Book1.ti
Page 117 and 118: Example: The following example woul
Page 119: Set Operators You can perform the f
Page 122 and 123: CHAPTER 21 File Handling This secti
Page 128 and 129: Reads data from a file into memory
Page 130 and 131: Reads from file into variable and g
Page 132 and 133: CHAPTER 22 Memory Management This s
Page 134 and 135: Resizing and Releasing Memory When
Page 136 and 137: Frees dynamically allocated memory
Page 138 and 139: Returns segment 37 procedure SetMem
Page 140 and 141: eadkey; clrscr; gotoxy(20,3); write
Page 144 and 145: Program DateDemo; uses sysutils; va
Page 146 and 147: 14 function EncodeDate( Year: Word;
Page 148 and 149: 39 function TimeStampToDateTime( co
Page 150 and 151: Objects This section shows the conc
Page 152 and 153: type Rectangle = object private len
Page 156 and 157: egin r1.init(3, 7); writeln('Draw a
Page 158 and 159: function TableTop.getmaterial(): st
Page 160 and 161: Classes This section shows the clas
Page 162 and 163: {$mode objfpc} // directive to be u
Page 164 and 165: Constructors and Destructors for Pa
Page 166 and 167: program inheritanceExample; {$MODE
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