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These names indicate not just what the variables represent, but also their units. This is of no significance to the compiler we could call the three variables tom, dick, and harry for all it cares but it s useful for humans looking at the code. Misunderstandings about whether a particular value is in metric or imperial units have been known to cause some extremely expensive problems, such as the accidental destruction of spacecraft. This particular race team seems to use the metric system. (If you re wondering why the fuel is in kilograms rather than, say, liters, it s because in high-performance motor racing, fuel is typically measured by weight rather than volume, just like it is in aviation. Fuel tends to expand or contract as the temperature changes you get better value for your money if you refill your car in the morning on a cold day than in the middle of a hot day so mass is more useful because it s a more stable measure.)

All three of the variable declarations in Example 2-5 start with the keyword double. This tells the compiler what kind of information the variable holds. For this example, we re clearly working with numbers, but .NET offers several different numeric types. Table 2-1 shows the complete set, and it may look like a bewildering assortment of

options, but in practice the choice usually goes one of three ways: int, double, or decimal, which represent integers, floating-point, or decimal floating-point numbers, respectively.

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As such, it is common that data read from a database is not passed through an input validation layer At the same time, another application component may have very reasonably decided that writing a string containing HTML metacharacters to the database is safe; the developer of that component may not be aware that the string is later read back from the database and displayed to the user as part of an HTML document At a very basic level, we make the observation that no risk arises from strings containing HTML (and potentially JavaScript) while they are being passed around within a web application, written to databases, used within database queries, and so forth Problems only arise when the string is sent to a user s browser and interpreted as HTML.

System.Single System.Double System.Byte System.SByte System.Int16 System.UInt16 System.Int32 System.UInt32 System.Int64 System.UInt64 System.Numer ics.BigInteger System.Decimal

Purpose Whole numbers and a limited range of fractions, with a wide range of values thanks to floating point. Occupies 32 bits of space. Double-precision version of float same idea, but using 64 bits. Non-negative integer. Occupies 8 bits. Represents values from 0 to 255. Signed integer. Occupies 8 bits. Represents values from 128 to 127. Signed integer. Occupies 16 bits. Represents values from 32,768 to 32,767. Non-negative integer. Occupies 16 bits. Represents values from 0 to 65,535. Signed integer. Occupies 32 bits. Represents values from 2,147,483,648 to 2,147,483,647. Nonnegative integer. Occupies 32 bits. Represents values from 0 to 4,294,967,295. Signed integer. Occupies 64 bits. Represents values from 9,223,372,036,854,775,808 to 9,223,372,036,854,775,807. Nonnegative integer. Occupies 64 bits. Represents values from 0 to 18,446,744,073,709,551,615. Signed integer. Grows in size as required. Value range limited only by available memory. Supports whole numbers and fractions. Slightly less efficient than double, but provides more predictable behavior when using decimal fractions.

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The code for Twitter.js will open in the VWD editor. To create more room to examine the code, click the Autohide icon in the Toolbox window. Note that all windows in VWD have this capability (see Figure 8-22).

An abstract base class is intended to provide the scaffolding for a hierarchy of related classes, but it is not intended to be instantiated itself, because it isn t finished. It requires that classes derived from it add in some missing bits. Let s turn our current firefighter into an abstract base for the others to use, and see how that works. First, we can add the abstract modifier to the class itself, and see what happens:

abstract class Firefighter { // ... }

It is in many cases not architecturally reasonable to enforce that all strings be HTMLsafe (free of HTML metacharacters or suitably escaped) throughout the system As such, we often cannot avoid addressing the problem by sanitizing strings at the time they are inserted into an HTML document, ie, by performing output sanitization This, of course, does not imply that you should be lenient with respect to input validation! You must always apply the strongest possible input validation constraints within the parameters given by your feature specifications Strict input validation will often prevent a missing.

As usual, we add the modifier before the class keyword (and after any accessibility modifiers, if present). If we build, we now get a compiler error:

Cannot create an instance of the abstract class or interface 'Firefighter'

That s because we re trying to create an instance of the Firefighter in our main function:

Firefighter joe = new Firefighter { Name = "Joe" };

This is no longer allowed, because the Firefighter class is now abstract. OK, we ll comment that out temporarily while we carry on refactoring. We want it to continue to build as we go so that we can see if we ve introduced any other errors:

In our discussion of symmetric and asymmetric algorithms thus far, when we have discussed keys, we have meant encryption keys. The most obvious application of encryption is to achieve confidentiality. Encryption, however, can be used to accomplish other security goals as well. Encryption can, for example, be used to achieve authentication. To demonstrate this, we start with an example toy protocol that allows us to do authentication with a public key cryptosystem.

//Firefighter joe = new Firefighter { Name = "Joe" }; //joe.ExtinguishFire;

Build and run, and we get the output we expect Bill is still spraying the water around:

VWD has a rich editor that has first-class capabilities. It recognizes JavaScript keywords and color codes them for easier identification and reading. There are many more features in the developer that you can read about in the documentation.

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