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The double and float types both offer the ability to support numbers with a fractional component. For example, you can represent the value 1.5 with either of these types, which you can t do with any of the integer types. The only difference between double and float is the level of precision available: since floating-point numbers have a fixed size, they can offer only a limited amount of precision. This means that they cannot represent any fraction the limited precision means floating-point numbers can only represent most numbers approximately.

Whenever more than one way of doing something exists in a programming system, a schism inevitably forms, offering the opportunity for long and pointless arguments over which is better.

If you re wondering why these are called floating-point types, the name is a technical description of how they work internally. These numbers contain a fixed number of binary digits to hold the value, and then another number that says where the . should go. So the point is a binary point, the binary equivalent of a decimal point. It s floating because it can move around.

If you need email service on your network, CentOS can provide it for you. With CentOS, you can install various mail servers that can send and retrieve email for your users. In this chapter, we will create a small email system on which you can send and receive email. You will see the essential software for email, including MTAs (such as sendmail and Postfix) and IMAP or POP servers. After testing the email system, you will configure an email client to test whether the setup works as expected.

A float offers about seven decimal places of precision, whereas a double offers about 17. (Strictly speaking, they offer 23 and 52 binary places of precision, respectively. These are binary formats, so their precision does not correspond to an exact number of decimal places of precision.) So the following code:

double x = 1234.5678; double y = x + 0.0001; Console.WriteLine(x); Console.WriteLine(y);

Before you start installing email server software, you must know how email is sent and received in the network. When you create and send email, you do the following: 1. 2. 3. 4. Open an email client such as Evolution. Type in a message. Provide the recipient email address Send the email.

prints out what you d expect:

1234.5678 1234.5679

If instead we use the float type:

In Figure 15-1, there are two components that are used when sending email: the mail user agent and the mail transfer agent. They interact whenever you send email to a recipient. The next sections explain the differences between these two components and the roles they play in email.

float x = 1234.5678f; float y = x + 0.0001f; Console.WriteLine(x); Console.WriteLine(y);

we get this:

After you ve created the Web site, you can build the Web pages. This application contains the following Web pages: Default.aspx: The home page of the application DepartmentMaintenance.aspx: Allows for maintenance of departments EmployeeMaintenance.aspx: Allows for maintenance of employees Goals.aspx: User enters goals in this page LocationMaintenance.aspx: Allows for maintenance of locations MaintenanceHome.aspx: A page with a menu linking to all the maintenance pages MyReviews.aspx: A page with all reviews for the user; if the user is a supervisor, contains the reviews of all the user s direct reports PerformanceCriteria.aspx: User selects a response to a specific question here QuestionMaintenance.aspx: Allows for maintenance of questions Review.aspx: All information for the review

1234.568 1234.568

Mail User Agents (MUAs) let users manage email on their email accounts. The email account is usually assigned by an administrator within a company or is created personally on an email service provider. With MUAs, users can create, read, send, retrieve, and remove messages on their email accounts. MUAs send the user s email account information, such as username and password, when connecting to the email server for validation before being able to access their email. MUAs are also known as email clients, and there are many to choose from when you manage email. For example, there is Mozilla Thunderbird and the integrated email software in the Mozilla Seamonkey. You can also use the Evolution email client included in the default desktop installation of CentOS, as you ll do in examples later in this chapter.

This often surprises new developers, but it s normal, and is by no means unique to C#. If only a limited amount of space is available, you simply cannot represent all possible numbers with complete accuracy. Floating point, approximate as it is, is the standard way to represent noninteger numbers in most programming languages, and you ll see this sort of inaccuracy anywhere.