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C++ Primer Plus 5TH Editionby Stephen Prata
Preface to the Fifth Edition
Learning C++ is an adventure of discovery, particularly because the language accommodates several programming paradigms, including object-oriented programming, generic programming, and the traditional procedural programming. C++ was a moving target as the language added new features, but now, with the ISO/ANSI C++ Standard, Second Edition (2003), in place, the language has stabilized. Contemporary compilers support most or all of the features mandated by the standard, and programmers have had time to get used to applying these features. The fifth edition of this book, C++ Primer Plus, reflects the ISO/ANSI standard and describes this matured version of C++.
C++ Primer Plus discusses the basic C language and presents C++ features, making this book self-contained. It presents C++ fundamentals and illustrates them with short, to-the-point programs that are easy to copy and experiment with. You'll learn about input/output (I/O), how to make programs perform repetitive tasks and make choices, the many ways to handle data, and how to use functions. You'll learn about the many features C++ has added to C, including the following:
The Primer Approach
C++ Primer Plus brings several virtues to the task of presenting all this material. It builds on the primer tradition begun by C Primer Plus nearly two decades ago and embraces its successful philosophy:
Following these principles, the book helps you understand this rich language and how to use it. For example:
The author and editors of this book do our best to keep the presentation to-the-point, simple, and fun. Our goal is that by the end of the book, you'll be able to write solid, effective programs and enjoy yourself doing so.
Sample Code Used in This Book
This book provides an abundance of sample code, most of it in the form of complete programs. Like the previous editions, this book practices generic C++ so that it is not tied to any particular kind of computer, operating system, or compiler. Thus, the examples were tested on a Windows XP system, a Macintosh OS X system, and a Linux system. Only a few programs were affected by compiler non-conformance issues. Compiler compliance with the C++ standard has improved since the previous edition of this book first appeared.
The sample code for the complete programs described in this book is available on the Sams website, at http://www.samspublishing.com. Enter this book's ISBN (without the hyphens) in the Search box and click Search. When the book's title is displayed, click the title to go to a page where you can download the code. You also can find solutions to selected programming exercises at this site.
How This Book Is Organized
This book is divided into 17 chapters and 10 appendixes, summarized here.
Chapter 1: Getting Started
Chapter 1 relates how Bjarne Stroustrup created the C++ programming language by adding object-oriented programming support to the C language. You'll learn the distinctions between procedural languages, such as C, and object-oriented languages, such as C++. You'll read about the joint ANSI/ISO work to develop a C++ standard. This chapter discusses the mechanics of creating a C++ program, outlining the approach for several current C++ compilers. Finally, it describes the conventions used in this book.
Chapter 2: Setting Out to C++
Chapter 2 guides you through the process of creating simple C++ programs. You'll learn about the role of the main() function and about some of the kinds of statements that C++ programs use. You'll use the predefined cout and cin objects for program output and input, and you'll learn about creating and using variables. Finally, you'll be introduced to functions, C++'s programming modules.
Chapter 3: Dealing with Data
C++ provides built-in types for storing two kinds of data: integers (numbers with no fractional parts) and floating-point numbers (numbers with fractional parts). To meet the diverse requirements of programmers, C++ offers several types in each category. Chapter 3 discusses those types, including creating variables and writing constants of various types. You'll also learn how C++ handles implicit and explicit conversions from one type to another.
Chapter 4: Compound Types
C++ lets you construct more elaborate types from the basic built-in types. The most advanced form is the class, discussed in Chapters 9 through 13. Chapter 4 discusses other forms, including arrays, which hold several values of a single type; structures, which hold several values of unlike types; and pointers, which identify locations in memory. You'll also learn how to create and store text strings and to handle text I/O by using C-style character arrays and the C++ string class. Finally, you'll learn some of the ways C++ handles memory allocation, including using the new and delete operators for managing memory explicitly.
Chapter 5: Loops and Relational Expressions
Programs often must perform repetitive actions, and C++ provides three looping structures for that purpose: the for loop, the while loop, and the do while loop. Such loops must know when they should terminate, and the C++ relational operators enable you to create tests to guide such loops. In Chapter 5 you learn how to create loops that read and process input character-by-character. Finally, you'll learn how to create two-dimensional arrays and how to use nested loops to process them.
Chapter 6: Branching Statements and Logical Operators
Programs can behave intelligently if they can tailor their behavior to circumstances. In Chapter 6 you'll learn how to control program flow by using the if, if else, and switch statements and the conditional operator. You'll learn how to use logical operators to help express decision-making tests. Also, you'll meet the cctype library of functions for evaluating character relations, such as testing whether a character is a digit or a nonprinting character. Finally, you'll get an introductory view of file I/O.
Chapter 7: Functions: C++'s Programming Modules
Functions are the basic building blocks of C++ programming. Chapter 7 concentrates on features that C++ functions share with C functions. In particular, you'll review the general format of a function definition and examine how function prototypes increase the reliability of programs. Also, you'll investigate how to write functions to process arrays, character strings, and structures. Next, you'll learn about recursion, which is when a function calls itself, and see how it can be used to implement a divide-and-conquer strategy. Finally, you'll meet pointers to functions, which enable you to use a function argument to tell one function to use a second function.
Chapter 8: Adventures in Functions
Chapter 8 explores the new features C++ adds to functions. You'll learn about inline functions, which can speed program execution at the cost of additional program size. You'll work with reference variables, which provide an alternative way to pass information to functions. Default arguments let a function automatically supply values for function arguments that you omit from a function call. Function overloading lets you create functions having the same name but taking different argument lists. All these features have frequent use in class design. Also, you'll learn about function templates, which allow you to specify the design of a family of related functions.
Chapter 9: Memory Models and Namespaces
Chapter 9 discusses putting together multifile programs. It examines the choices in allocating memory, looking at different methods of managing memory and at scope, linkage, and namespaces, which determine what parts of a program know about a variable.
Chapter 10: Objects and Classes
A class is a user-defined type, and an object (such as a variable) is an instance of a class. Chapter 10 introduces you to object-oriented programming and to class design. A class declaration describes the information stored in a class object and also the operations (class methods) allowed for class objects. Some parts of an object are visible to the outside world (the public portion), and some are hidden (the private portion). Special class methods (constructors and destructors) come into play when objects are created and destroyed. You will learn about all this and other class details in this chapter, and you'll see how classes can be used to implement ADTs, such as a stack.
Chapter 11: Working with Classes
In Chapter 11 you'll further your understanding of classes. First, you'll learn about operator overloading, which lets you define how operators such as + will work with class objects. You'll learn about friend functions, which can access class data that's inaccessible to the world at large. You'll see how certain constructors and overloaded operator member functions can be used to manage conversion to and from class types.
Chapter 12: Classes and Dynamic Memory Allocation
Often it's useful to have a class member point to dynamically allocated memory. If you use new in a class constructor to allocate dynamic memory, you incur the responsibilities of providing an appropriate destructor, of defining an explicit copy constructor, and of defining an explicit assignment operator. Chapter 12 shows you how and discusses the behavior of the member functions generated implicitly if you fail to provide explicit definitions. You'll also expand your experience with classes by using pointers to objects and studying a queue simulation problem.
Chapter 13: Class Inheritance
One of the most powerful features of object-oriented programming is inheritance, by which a derived class inherits the features of a base class, enabling you to reuse the base class code. Chapter 13 discusses public inheritance, which models is-a relationships, meaning that a derived object is a special case of a base object. For example, a physicist is a special case of a scientist. Some inheritance relationships are polymorphic, meaning you can write code using a mixture of related classes for which the same method name may invoke behavior that depends on the object type. Implementing this kind of behavior necessitates using a new kind of member function called a virtual function. Sometimes using abstract base classes is the best approach to inheritance relationships. This chapter discusses these matters, pointing out when public inheritance is appropriate and when it is not.
Chapter 14: Reusing Code in C++
Public inheritance is just one way to reuse code. Chapter 14 looks at several other ways. Containment is when one class contains members that are objects of another class. It can be used to model has-a relationships, in which one class has components of another class. For example, an automobile has a motor. You also can use private and protected inheritance to model such relationships. This chapter shows you how and points out the differences among the different approaches. Also, you'll learn about class templates, which let you define a class in terms of some unspecified generic type, and then use the template to create specific classes in terms of specific types. For example, a stack template enables you to create a stack of integers or a stack of strings. Finally, you'll learn about multiple public inheritance, whereby a class can derive from more than one class.
Chapter 15: Friends, Exceptions, and More
Chapter 15 extends the discussion of friends to include friend classes and friend member functions. Then it presents several new developments in C++, beginning with exceptions, which provide a mechanism for dealing with unusual program occurrences, such an inappropriate function argument values and running out of memory. Then you'll learn about RTTI, a mechanism for identifying object types. Finally, you'll learn about the safer alternatives to unrestricted typecasting.
Chapter 16: The string Class and the Standard Template Library
Chapter 16 discusses some useful class libraries recently added to the language. The string class is a convenient and powerful alternative to traditional C-style strings. The auto_ptr class helps manage dynamically allocated memory. The STL provides several generic containers, including template representations of arrays, queues, lists, sets, and maps. It also provides an efficient library of generic algorithms that can be used with STL containers and also with ordinary arrays. The valarray template class provides support for numeric arrays.
Chapter 17: Input, Output, and Files
Chapter 17 reviews C++ I/O and discusses how to format output. You'll learn how to use class methods to determine the state of an input or output stream and to see, for example, whether there has been a type mismatch on input or whether the end-of-file has been detected. C++ uses inheritance to derive classes for managing file input and output. You'll learn how to open files for input and output, how to append data to a file, how to use binary files, and how to get random access to a file. Finally, youlearn how to apply standard I/O methods to read from and write to strings.
Appendix A: Number Bases
Appendix A discusses octal, hexadecimal, and binary numbers.
Appendix B: C++ Reserved Words
Appendix B lists C++ keywords.
Appendix C: The ASCII Character Set
Appendix C lists the ASCII character set, along with decimal, octal, hexadecimal, and binary representations.
Appendix D: Operator Precedence
Appendix D lists the C++ operators in order of decreasing precedence.
Appendix E: Other Operators
Appendix E summarizes the C++ operators, such as the bitwise operators, not covered in the main body of the text.
Appendix F: The string Template Class
Appendix F summarizes string class methods and functions.
Appendix G: The STL Methods and Functions
Appendix G summarizes the STL container methods and the general STL algorithm functions.
Appendix H: Selected Readings and Internet Resources
Appendix H lists some books that can further your understanding of C++.
Appendix I: Converting to ANSI/ISO Standard C++
Appendix I provides guidelines for moving from C and older C++ implementations to ANSI/ISO C++.
Appendix J: Answers to Review Questions
Appendix J contains the answers to the review questions posed at the end of each chapter.
Note to Instructors
One of the goals of this edition of C++ Primer Plus is to provide a book that can be used as either a teach-yourself book or as a textbook. Here are some of the features that support using C++ Primer Plus, Fifth Edition, as a textbook:
Conventions Used in This Book
This book uses several typographic conventions to distinguish among various kinds of text:
This book includes several elements intended to illuminate specific points:
Systems Used to Develop This Book's Programming Examples
For the record, the examples in this book were developed using Microsoft Visual C++ 7.1 (the version that comes with Microsoft Visual Studio .NET 2003) and Metrowerks CodeWarrior Development Studio 9 on a Pentium PC with a hard disk and running under Windows XP Professional. Most programs were checked using the Borland C++ 5.5 command-line compiler and GNU gpp 3.3.3 on the same system, using Comeau 4.3.3 and GNU g++ 3.3.1 on an IBM-compatible Pentium running SuSE 9.0 Linux, and using Metrowerks Development Studio 9 on a Macintosh G4 under OS 10.3. This book reports discrepancies stemming from lagging behind the standard generically, as in "older implementations use ios::fixed instead of ios_base::fixed." This book reports some bugs and idiosyncrasies in older compilers that would prove troublesome or confusing; most of these have been fixed in current releases.
C++ offers a lot to the programmer; learn and enjoy!
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