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We do not cover each of these security techniques in detail here, but we do cover the basic ideas and provide references to papers and books that you can read to learn more Such techniques are written in italics, and bibliographic references to where you can learn more are listed in Section A6 Keep in mind that many ideas or techniques may fall in different regions of our map, so there is more than one way to organize the constituent components To start with, by failure we mean the halt of processing of one or more system components as a result of expected or unexpected shutdown or malfunction For example, a file server may temporarily fail due to a user inadvertently kicking the power cord A user or node lies when it provides false information or pretends to be someone else.

This happens to be a special name the C# compiler will expect your program to provide one static method called Main, and it ll run that method when the program is launched The method name is followed by a parameter list, which declares the input the method requires This particular example s parameter list is (string[] args), which says that it expects just a single input and that the code will refer to it using the name args It expects this input to be a sequence of text strings (the square brackets indicating that multiple strings may be passed instead of just one) As it happens, this particular program doesn t use this input, but it s a standard feature of the specially named Main method command-line arguments are passed in here.

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We ll return to this later in the chapter when we write a program that makes use of command-line arguments, but for now, our example doesn t use it So we ll move on to the final part of the example the code inside the Main method that was the one part we added to Visual Studio s contributions and which represents the only work this program does:.

Console.WriteLine("Hello, world");

This shows the C# syntax for invoking a method. Here we re using a method provided by the Console class, which is part of the .NET Framework class library, and it is defined in the System namespace. We could have written the fully qualified name, in which case the code would look like this:

System.Console.WriteLine("Hello, world");

For example, two inventors may both claim that their invention was submitted first to an online patent registration system In an infiltration, an adversary attempts to break into the system and use one or more resources or capabilities available to the system to his advantage For example, an adversary may want to infiltrate a Microsoft Exchange e-mail server to cause it to attach a virus to all outgoing e-mails In this example, the server s ability to send mail to users is the capability that the adversary takes advantage of Note that there are relationships between these various threats For example, infiltration can be used to cause a failure Similarly, lying can be used to infiltrate a system..

if(lon && lon.length == 0) lon = itemNode.getElementsByTagName("long"); if(lon && lon.length > 0) lon = lon[0].text; resultArray[i] = new RSSItem(title, link, description, source, sourceLink, author, tags, comments, commentRss, pubDate, mediaLink, mediaType, lat, lon); } } return resultArray; } } else {

But because of the using System; directive earlier, we can use the shorter version it means the same thing, it s just more concise. The Console class provides the ability to display text in a console window and to read input typed by the user in an old-fashioned command-line application. In this case, we re invoking the class s WriteLine method, passing it the text "Hello, world". The WriteLine method will write whatever text we provide out to the console window.

This is the essential difference between the so-called functional and procedural approaches to coding, by the way. Code that just performs a computation or calculation and returns the result is called functional because it s similar in nature to mathematical functions such as cosine, and square root. Procedural code tends to perform a sequence of actions. In some languages, such as F#, the functional style dominates, but C# programs typically use a mixture of both styles.

You ll have noticed that the dot (.) is being used to mean different things here. We can use it to delineate the namespace name and the type name; for example, System.Console means the Console type in the System namespace. It can also be used to break up a namespace name, as in System.IO. Our example also uses it to indicate that we want to use a particular method provided by a class, as in Console.WriteLine. And as you ll see, the dot turns up in a few other places in C#. Broadly speaking, the dot signifies that we want to use something that s inside something else. The C# compiler works out from context exactly what that means.

Although we picked over every line of code in this simple example, we haven t quite finished exploring what Visual Studio did for us when we asked it to create a new application. To fully appreciate its work, we need to step out of the Program.cs source file and look at the whole project.

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