Advantages of Using Class in Visual Studio .NET

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Advantages of Using Class
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Members
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There are three advantages to using static members rather than globals:
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1 The name of a static member is in the scope of the class, thereby avoiding name collisions with members of other classes or global objects 2 Encapsulation can be enforced A static member can be a private member; a global object cannot 3 It is easy to see by reading the program that a static member is associated with a particular class This visibility clarifies the programmer's intentions
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Definingstatic Members
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Amember ismade static by prefixing the member declaration with the keyword static The static members obey the normal public/private access rules As an example, consider a simple class intended to represent a bank account Each account has a balance and an owner Each account earns interest monthly, but the interest rate applied to each account is always the same We could write this class as
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class Account { public: // interface functions here void applyint() { amount += amount * interestRate; } static double rate() { return interestRate; } static void rate(double); // sets a new rate private:
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std::string owner; double amount; static double interestRate; C++ Primer, initRate(); static doubleFourth Edition
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By Stanley B Lippman,Jos e Lajoie, Barbara E Moo Publisher:Addison Wesley Professional Each object of this class has two data members: owner and amount Objects do not have data Pub Date: February 14, 2005 members that correspond to static data members Instead, there is a single interestRate Print by all objects of type object that is shared ISBN: 0-201-72148-1 Account Pages: 912
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Table of Contents | Index
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Using a Class static Member
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This popular tutorial introduction to standard C++ has from the class using the scope operator help Astatic member can be invoked directly been completely updated, reorganized, and rewritten toor indirectly programmers object, reference, and use it in more object of its class type through an learn the language faster or pointerato anmodern, effective wayJust as C++ has evolved since the last edition, so has the authors' approach to teaching it They now introduce the C++ standard library from the beginning, giving readers the means to write useful programs without first having to master every language detail Highlighting today's best Account ac1; practices, they show how to write programs that are safe, can be built quickly, and yet offer outstanding performance Account *ac2 = &ac1; Examples that take advantage of the library, and explain the features of C++, also show how to make the best use of the language As in its previous editions, the static memberratefunction fundamental C++ concepts and techniques makes // equivalent ways to call the book's authoritative discussion of it a valuable resource even for more experienced programmersProgram Faster and More Effectively with This Rewritten double rate; Classicrate = ac1rate(); Restructured for quicker learning, using the C++ standardAccount object or reference current programming // through an library Updated to teach the most styles and program design techniques Filled with// through aids that emphasize important points, warn about common new learning a pointer to an Account object rate = ac2->rate(); pitfalls,rate =good programming practices, and provide general usage tips Complete with exercises that reinforce skills suggest Account::rate(); // directly from the class using the scope operator learned Authoritative and comprehensive in its coverageThe source code for the book's extended examples is available on the Web at the address below
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As with other members, a class member function can refer to a class static member without the use of the scope operator:
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class Account { public: // interface functions here void applyint() { amount += amount * interestRate; } };
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Exercises Section 126
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Exercise 1236:
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What is a static class member What are the advantages of static members How do they differ from ordinary members Write your own version of the Account class
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Exercise 1237:
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