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Herb Schildt's C++ Programming Cookbook
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programming problems It is not about teaching the fundamentals of the C++ language) If you need to improve your C++ skills, I recommend my books C++: The Complete Reference, C++ From the Ground Up, and C++: A Beginner's Guide All are published by McGraw-Hill, Inc
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What Version of C++
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The code and discussions in this book are based on the ANSI/ISO International Standard for C++ Unless explicitly stated otherwise, no non-standard extensions are used As a result, the majority of techniques presented here are portable and can be used with any C++ compiler that adheres to the International Standard for C++ The code in this book was developed and tested with Microsoft's Visual C++ Both Visual Studio and Visual C++ Express (which is available free of charge from Microsoft) were used
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NOTE At the time of this writing, the International Standard for C++ is in the process of being
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updated Many new features are being contemplated However, none of them are formally part of C++ at this time and are, therefore, not used in this book Of course, future editions of this book may make use of these new features
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Before moving on to the recipes, there are two issues to discuss that relate to how the code in this book is written The first relates to returning a value from main( ) The second concerns the use of namespace std The following explains the decisions that I made relating to these two features
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The code examples in this book always explicitly return an integer value from main( ) By convention, a return value of zero indicates successful termination A non-zero return value indicates some form of error Explicitly returning a value from main( ) is not technically necessary, however, because in the words of the International Standard for C++: "If control reaches the end of main without encountering a return statement, the effect is that of executing return 0;" For this reason, you will occasionally find code that does not explicitly return a value from main( ), relying instead upon the implicit return value of zero But this is not the approach used by this book Instead, all of the main( ) functions in this book explicitly return a value because of two reasons First, some compilers issue a warning when a non-void method fails to explicitly return a value To avoid this warning, main( ) must include a return statement Second, it just seems good practice to explicitly return a value, given that main( ) is declared with an int return type!
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Using Namespace std
One of the problems that a writer of a C++ book faces is whether or not to use the line:
using namespace std;
1:
Overview
near the top of each program This statement brings the contents of the std namespace into view The std namespace contains the C++ standard library Thus, by using the std namespace, the standard library is brought into the global namespace, and names such as cout can be referred to directly, rather than as std::cout The use of
using namespace std;
is both very common and occasionally controversial Some programmers dislike it, suggesting that it defeats the point of packaging the standard library into the std namespace and invites conflicts with third-party code, especially in large projects While this is true, others point out that in short programs (such as the examples shown in this book) and in small projects, the convenience it offers easily offsets the remote chance of conflicts, which seldom (if ever) occur in these cases Frankly, in programs for which the risk of conflicts is essentially zero, having to always write std::cout, std::cin, std::ofstream, std::string, and so on is tedious It also makes the code more verbose The foregoing debate notwithstanding, this book uses
using namespace std;
in the example programs for two reasons First, it makes the code shorter, which means that more code can fit on a line In a book, line-length is limited Not having to constantly use std:: shortens lines, which means that more code can fit on a single line without causing the line to break The fewer broken lines, the easier the code is to read Second, it makes the code examples less verbose, which enhances their clarity on the printed page It has been my experience that using namespace std is very helpful when presenting example programs shown in a book However, its use in the examples is not meant as an endorsement of the technique in general You must decide what is appropriate for your own programs
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