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// Demonstrate an array overrun. using System; class ArrayErr { static void Main() { int[] sample = new int[10]; int i; // Generate an array overrun. for(i = 0; i < 100; i = i+1) sample[i] = i; } }

But now there is a problem: we cannot solve this equation uniquely for f 1 (t). 1 (t) = + t or f 1 (t) = t. Thus f 1 is not We do not know whether f a well de ned function. Therefore f is not invertible and f 1 does not exist. Math Note: There is a simple device which often enables us to obtain an inverse even in situations like Example 1.42. We change the domain of the function. This idea is illustrated in the next example. EXAMPLE 1.43 De ne f : {s : s 0} {t : t 0} by the formula f (s) = s 2 . Find f 1 . SOLUTION We attempt to solve (f f 1 )(t) = t. Writing this out, we have f (f 1 (t)) = t or [f 1 (t)]2 = t.

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his chapter builds upon the configuration concepts discussed in 11, covering some of the basic commands that you can use to access and configure a Cisco IOS router, which are, as you will see, much like those on the Catalyst IOS switches. The advantage this provides is that you don t have to learn a complete new command-line interface (CLI). The first thing covered is the components of the router and its bootup process, including the use of the System Configuration Dialog script: this prompts you for information about how you want to configure your router.You ll also learn about a new feature introduced in version 12.3T code, called AutoSecure. Finally, the chapter covers the commands used to create a very basic configuration on your IOS router, including setting up an interface for trunking.

CHAPTER 22:

Figure 9-3

Figure 3.19 Build to Design. (Image courtesy of Vico.)

Because Joe s self-mastery level is consistent and so close to high self-mastery, he will be most stimulated to grow by the coaching approaches for high selfmastery Nines. Provide positive reinforcement each time Joe expresses himself quickly and clearly, especially when he does so in a context that contains some opposition to his thoughts. Be sure to reinforce him every time he does this during coaching conversations for example, when he disagrees with the coach and about examples he brings from work. Explore the positive impact of this behavior on others, but also how he felt about himself. This will provide additional reinforcement. Focus on action he takes in addition to the self-assertion described above. Encourage him to act, and acknowledge him each time he does so or reports having done so.

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In object-oriented programming it is sometimes helpful to define what a class must do, but not how it will do it. You have already seen an example of this: the abstract method. An abstract method declares the return type and signature for a method, but provides no implementation. A derived class must provide its own implementation of each abstract method defined by its base class. Thus, an abstract method specifies the interface to the method, but not the implementation. Although abstract classes and methods are useful, it is possible to take this concept a step further. In C#, you can fully separate a class interface from its implementation by using the keyword interface. Interfaces are syntactically similar to abstract classes. However, in an interface, no method can include a body. That is, an interface provides no implementation whatsoever. It specifies what must be done, but not how. Once an interface is defined, any number of classes can implement it. Also, one class can implement any number of interfaces. To implement an interface, a class must provide bodies (implementations) for the methods described by the interface. Each class is free to determine the details of its own implementation. Thus, two classes might implement the same interface in different ways, but each class still supports the same set of methods. Therefore, code that has knowledge of the interface can use objects of either class since the interface to those objects is the same. By providing the interface, C# allows you to fully utilize the one interface, multiple methods aspect of polymorphism.

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4.6 Communications Standards The design and production testing of communications network elements, as well as installation and ongoing maintenance and management, depend heavily on national, regional, and international standards. The following information provides a brief introduction to how these standards are set and how to get more information. Communications standards come from three sources: