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The sample programs shown in this chapter make use of two built-in methods: WriteLine( ) and Write( ) As mentioned, these methods are members of the Console class, which is part of the System namespace, which is defined by the NET Framework s class library As explained earlier in this chapter, the C# environment relies on the NET Framework class library to provide support for such things as I/O, string handling, networking, and GUIs Thus, the C# environment as a totality is a combination of the C# language itself, plus the NET standard classes As you will see, the class library provides much of the functionality that is part of any C# program Indeed, part of becoming a C# programmer is learning to use these standard classes Throughout Part I, various elements of the NET library classes and methods are described Part II examines portions of the NET library in detail

his chapter examines three fundamental elements of C#: data types, literals, and variables In general, the types of data that a language provides define the kinds of problems to which the language can be applied As you might expect, C# offers a rich set of built-in data types, which makes C# suitable for a wide range of applications You can create variables of any of these types, and you can specify constants of each type, which in the language of C# are called literals

Data types are especially important in C# because it is a strongly typed language This means that, as a general rule, all operations are type-checked by the compiler for type compatibility Illegal operations will not be compiled Thus, strong type-checking helps prevent errors and enhances reliability To enable strong type-checking, all variables, expressions, and values have a type There is no concept of a typeless variable, for example Furthermore, a value s type determines what operations are allowed on it An operation allowed on one type might not be allowed on another

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Three predefined streams, which are exposed by the properties called ConsoleIn, ConsoleOut, and ConsoleError, are available to all programs that use the System namespace ConsoleOut refers to the standard output stream By default, this is the

Part I:

console When you call ConsoleWriteLine( ), for example, it automatically sends information to ConsoleOut ConsoleIn refers to standard input, which is, by default, the keyboard ConsoleError refers to the standard error stream, which is also the console by default However, these streams can be redirected to any compatible I/O device The standard streams are character streams Thus, these streams read and write characters

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The NET Framework defines both byte and character stream classes However, the character stream classes are really just wrappers that convert an underlying byte stream to a character stream, handling any conversion automatically Thus, the character streams, although logically separate, are built upon byte streams The core stream classes are defined within the SystemIO namespace To use these classes, you will usually include the following statement near the top of your program:

lems resulting from weather or labor unrest or zoning or taxation in Florida If these problems occur in Florida, and we have more than one factory in Florida, it is easy to no doubt see the problem Both factories is effected, not just one factory It s easy to understand why some of us lean toward selecting Florida but we should use objective, not subjective, criteria to make the decision If we do that, we must conclude that the site with the highest pro t potential at the lowest risk is Georgia

using SystemIO;

The reason that you don t have to specify SystemIO for console input and output is that the Console class is defined in the System namespace

The core stream class is SystemIOStream Stream represents a byte stream and is a base class for all other stream classes It is also abstract, which means that you cannot instantiate a Stream object Stream defines a set of standard stream operations Table 14-1 shows several commonly used methods defined by Stream Several of the methods shown in Table 14-1 will throw an IOException if an I/O error occurs If an invalid operation is attempted, such as attempting to write to a stream that is read-only, a NotSupportedException is thrown Other exceptions are possible, depending on the specific method

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