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After completing the download, unzip the contents into a folder. Remember to save the file contents with folder names extraction option to make sure you preserve the directory structure of the folders in the SDK. Go to the location where you unzipped the SDK, and you should see the root directory structure shown in Figure 8-4.

Even before we compile, we can see that there s a problem we happen to have added the altitude parameter so that it is the first in the list, and angle stays second. In our main constructor, the altitude comes after the angle. Because they are both just doubles, there s nothing to stop you from accidentally passing the parameters the wrong way round. This is the exactly the kind of thing that surprises users of your class, and leads to hard-to-find bugs. But while inconsistent parameter ordering is bad design, it s not a showstopper. However, when we compile, things get even worse. We get another error:

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When we define more than one member in a type with the same name (be it a constructor or, as we ll see later, a method) we call this overloading. Initially, we created two constructors (two overloads of the constructor) for Polar Point3D, and they compiled just fine. This is because they took different sets of parameters. One took three doubles, the other two. In fact, there was also the third, hidden constructor that took no parameters at all. All three constructors took different numbers of parameters, meaning there s no ambiguity about which constructor we want when we initialize a new PolarPoint3D. The constructor in Example 3-31 seems different: the two doubles have different names. Unfortunately, this doesn t matter to the C# compiler it only looks at the types of the parameters, and the order in which they are declared. It does not use names for

disambiguation. This should hardly be surprising, because we re not required to provide argument names when we call methods or constructors. If we add the overload in Example 3-31, it s not clear what new PolarPoint3D(0, 0) would mean, and that s why we get an error we ve got two members with the same name (PolarPoint3D the constructor), and exactly the same parameter types, in the same order. Looking at overloaded functions will emphasize that it really is only the method name and the parameters that matter a function s return type is not considered to be a disambiguating aspect of the member for overload purposes. That means there s nothing we can do about it: we re going to have to get rid of this third constructor (just delete it); and while we re in the code, we ll finish up the declaration of the data portion of our Plane by adding a property for its position, shown in Example 3-32.

public PolarPoint3D Position { get; set; }

The chief financial officer (CFO) of a company may have the authority to transfer money from the company s bank account to any another, but you want to hold the CFO accountable for any actions that could be carried out under her authority The CFO should have the ability to transfer money from the company account to other accounts because the company may have certain financial commitments to creditors, vendors, or investors, and part of the CFO s job may involve satisfying those commitments Yet, the CFO could abuse that capability Suppose the CFO, after logging into the system, decides to transfer some money from the company s bank account to her own personal account, and then leave the country When the missing funds are discovered, the system log can help you ascertain whether or not it was the CFO who abused her privileges.

Just as with constructors, we can provide more than one method with the same name, but a different list of parameter types. It is, in general, a bad idea to provide two overloads with the same name if they perform a semantically different operation (again that s the kind of thing that surprises developers using your class), so the most common reason for overloading is to provide several different ways to do something. We can provide users of our code with flexible methods that take lots of arguments to control different aspects of the code, and we can also provide developers that don t need this flexibility with simpler options by providing overloads that don t need as many arguments. Suppose we added a method to our Plane class enabling messages to be sent to aircraft. Perhaps in our first attempt we define a method whose signature looks like this:

public void SendMessage(string messageText)

But suppose that as the project progresses, we find that it would be useful to be able to delay transmission of certain messages. We could modify the SendMessage method so that it accepts an extra argument. There s a handy type in the framework called TimeSpan which lets us specify duration. We could modify the method to make use of it:

public void SendMessage(string messageText, TimeSpan delay)

Alas! If we already had code in our project depending on the original signature, we d start to see this compiler error:

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