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126 Day 4 Listing 4.5. continued 20: outfile.close(); 21: cout
Totally Immersed: C++ Classes and Object-Oriented Programming For example, sometimes you want to append data to the end of an existing file rather than create a new file. In that case you can append data to the end of a file by opening the file in append mode. To specify append mode, you must use one of the ios class’s open_mode specifiers in the ofstream constructor when you create the object: ofstream outfile(“test.dat”, ios::app); // open in append mode This file will be opened in append mode and any new data written to the file will be written to the end of the file. There are several specifiers you can use when opening files. Table 4.1 lists the open_mode enumeration’s values and their descriptions. Table 4.1. ios class open_mode specifiers. Specifier Description app The file is opened and any new data will be appended to the end of the file. ate Seek to the end of the file when the file is opened. in The file is opened for input (reading). This is the default for the ifstream class. out The file is opened for output (writing). This is the default for the ofstream class. binary The file is opened in binary mode. The default is to open the file in text mode. In text mode, when the file is read, carriage-return/ linefeed (CR/LF) pairs are converted to a single linefeed character (LF). When the file is written, linefeed characters are converted to CR/LF pairs before being written to the file. In binary mode no conversion of CR/LR pairs takes place. trunc Opens the file and clears the contents. If neither app nor ate are specified, trunc is the default. nocreate The file will not be created if it does not exist. Open() will fail if the file does not exist. Opening an ifstream with this flag can be used to check for the existence of a file. noreplace Similar to nocreate except that Open will fail unless either app or ate is specified. You can or together two or more of the values listed in Table 4.1 if needed. For example, let’s say you wanted to open a file in binary mode and that you wanted to append data to the end of the file. In that case the constructor would look like this: ofstream outfile(“test.dat”, ios::app | ios::binary); 127 4
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At a Glance At A Glance WEEK 1 In W
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Day 1 Getting Your Feet Wet Week Ge
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Getting Your Feet Wet are divided i
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NOTE Getting Your Feet Wet As you m
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Getting Your Feet Wet but you need
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NOTE Getting Your Feet Wet In order
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NOTE Getting Your Feet Wet In C++,
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Getting Your Feet Wet An object, li
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Getting Your Feet Wet In some progr
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Listing 1.3. WRAPME.CPP. Getting Yo
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Getting Your Feet Wet Operator Desc
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NEW TERM Figure 1.5. Anatomy of a f
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SYNTAX ▼ ▲ Getting Your Feet We
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Getting Your Feet Wet Let’s prove
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Getting Your Feet Wet There is a sh
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Getting Your Feet Wet When the prog
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NOTE Function Description Getting Y
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NOTE Getting Your Feet Wet numbers
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Quiz Getting Your Feet Wet Windows
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Day 2 Wading In Deeper Wading In De
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NOTE Wading In Deeper If the condit
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SYNTAX ▼ ▼ TIP TIP Wading In De
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SYNTAX Wading In Deeper immediately
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Listing 2.1. FORLOOP.CPP. Wading In
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SYNTAX ▼ ▲ SYNTAX ▼ ▲ The w
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Wading In Deeper for (int i=0;i
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▲ default: dflt_statements; break
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Wading In Deeper This code generate
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NOTE Wading In Deeper You can creat
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Wading In Deeper So how do the sour
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Wading In Deeper 20: sizeof(listArr
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NOTE Wading In Deeper The displayRe
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Workshop Wading In Deeper The Works
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Day 3 Up to Your Neck in C++ Up to
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Up to Your Neck in C++ In this case
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Up to Your Neck in C++ Figure 3.1.
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Up to Your Neck in C++ That won’t
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The C++Builder IDE Explored: Projec
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NOTE The C++Builder IDE Explored: P
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TIP Figure 6.11. The About box with
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Figure 6.18. The About box for the
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Figure 6.20. The Project Options di
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Quiz The C++Builder IDE Explored: P
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Working with the Form Designer and
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NOTE Working with the Form Designer
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NOTE TIP TIP Working with the Form
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NOTE Figure 7.10. The Alignment Pal
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Quiz Working with the Form Designer
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In Review In Review WEEK 1 You cove
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In Review displayed based on user i
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At a Glance At A Glance WEEK 2 Are
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Day 8 VCL Components VCL Components
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VCL Components C++Builder displays
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VCL Components Important Common Pro
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Cursors VCL Components The Cursor p
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Figure 8.2. The Object Inspector sh
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VCL Components You can set this pro
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VCL Components Method Description I
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VCL Components Similarly, when the
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NOTE TIP VCL Components There may b
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VCL Components or load the Memo wit
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VCL Components Item Applies To Desc
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VCL Components You can use owner-dr
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VCL Components Property Applies To
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VCL Components for buttons that are
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VCL Components property set to true
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NOTE VCL Components To set the glyp
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VCL Components The GroupIndex Prope
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NOTE VCL Components form. Like the
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VCL Components As such, they go wit
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VCL Components The File Open and Fi
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VCL Components The InitialDir Prope
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VCL Components The Font dialog box
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Quiz VCL Components Q I’m respond
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Day 9 Creating Applications in C++B
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Figure 9.1. The Object Repository w
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Creating Applications in C++Builder
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TIP Creating Applications in C++Bui
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NOTE NOTE Creating Applications in
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Figure 9.4. The Object Repository c
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NOTE Creating Applications in C++Bu
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TIP Creating Applications in C++Bui
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Summary Creating Applications in C+
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More on Projects Day 10 More on Pro
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More on Projects The only time this
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TIP More on Projects You can add mo
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More on Projects Table 10.1. The Pr
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Figure 10.6. The Project Explorer s
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■ Forms ■ Application ■ C++
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NOTE NOTE More on Projects if (!Abo
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Figure 10.9. The C++ page of the Pr
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NOTE TIP More on Projects To avoid
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NOTE More on Projects Compiler and
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More on Projects The Show warnings
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More on Projects The C++Builder Cod
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NOTE More on Projects If you open a
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More on Projects menu or press Ctrl
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Figure 10.13. The Code Editor with
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More on Projects find a matching br
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More on Projects The Editor Page Th
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NOTE More on Projects I usually get
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Quiz More on Projects Q When I star
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More on Projects 8. Continuing with
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Using the Debugger Day 11 Using the
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Using the Debugger Item Shortcut De
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NOTE Using the Debugger is highligh
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NOTE Using the Debugger any conditi
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Using the Debugger Conditional Brea
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Using the Debugger The variable nam
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Using the Debugger The fastest way
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Using the Debugger The Watch List i
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NOTE Using the Debugger When you us
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NOTE Using the Debugger The Methods
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NOTE Using the Debugger in the Eval
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CPU View Using the Debugger The CPU
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NOTE Using the Debugger builds. Rem
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Using the Debugger macros, TRACE an
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Using the Debugger The diagnostic m
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Using the Debugger ■ Ordinarily y
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Quiz Using the Debugger 1. How do y
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C++Builder Database Architecture Da
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C++Builder Database Architecture Te
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C++Builder Database Architecture an
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C++Builder Database Architecture
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C++Builder Database Architecture Pr
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C++Builder Database Architecture Th
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C++Builder Database Architecture To
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Event Catalyst C++Builder Database
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WARNING C++Builder Database Archite
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C++Builder Database Architecture Lo
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C++Builder Database Architecture A
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C++Builder Database Architecture da
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Method Function C++Builder Database
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C++Builder Database Architecture St
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C++Builder Database Architecture Ta
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C++Builder Database Architecture Ta
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C++Builder Database Architecture Up
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C++Builder Database Architecture Ke
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TIP C++Builder Database Architectur
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Building Internet Applications Day
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Building Internet Applications Tabl
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Building Internet Applications prop
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Building Internet Applications Noti
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Building Internet Applications 20:
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Building Internet Applications 65:
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Quiz Building Internet Applications
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C++Builder Extensions to C++ Day 14
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C++Builder Extensions to C++ compil
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C++Builder Extensions to C++ Anothe
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C++Builder Extensions to C++ __int8
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C++Builder Extensions to C++ value
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C++Builder Extensions to C++ you ca
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In Review In Review WEEK 2 Wow, tha
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Answers to Quiz Questions APPENDIX
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Day 3 Day 4 Answers to Quiz Questio
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Answers to Quiz Questions 4. Hold d
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Day 10 Answers to Quiz Questions 1.
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Symbols & (ampersands), 246 © (cop
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C C (programming language), 132 C c
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File Save, 309-312 Find/Replace, 31
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Insert Template, 248 Object Reposit
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Cascade( ), 198 Close( ), 198 Close
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Layout property (BitBtn component),
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object-oriented programming, see OO
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protected member functions, 106 pro
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structures arrays, 58 C vs. C++, 64
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A V I A C O M S E R V I C E The Inf
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Component Palette Quick Reference S
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Add to Your Sams Library Today with
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Overview Introduction Introduction
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Introduction VCL Explored .........
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