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In the late 1980s and early 1990s, standardization efforts were underway to define an internationally acceptable encoding that would allow characters from all scripts to be represented in a reasonably consistent manner. This became the Unicode standard, and is the one that is in use in the .NET Framework. Unicode is a complex standard, as might be expected from something that is designed to deal with all current (and past) human languages, and have sufficient flexibility to deal with most conceivable future changes, too. It uses numbers to define more than 1 million code points in a codespace. A code point is roughly analogous to a character in other encodings, including formal definitions of special categories such as graphic characters, format characters, and control characters. It s possible to represent a sequence of code points as a sequence of 16-bit values. You might be wondering how we can handle more than 1 million characters, when there are only 65,536 different values for 16-bit numbers. The answer is that we can team up pairs of characters. The first is called a high surrogate; if this is then followed by a low surrogate, it defines a character outside the normal 16-bit range. Unicode also defines complex ways of combining characters. Characters and their diacritical marks can appear consecutively in a string, with the intention that they become combined in their ultimate visual representation; or you can use multiple characters to define special ligatures (characters that are joined together, like ). The .NET Framework Char, then, is a 16-bit value that represents a Unicode code point.

Keyhole Markup Language (KML) is an XML-based language for managing the display of three-dimensional geospatial data in the mapping web applications like Google Maps and Microsoft Virtual Earth.

This encoding is called UTF-16, and is the common in-memory representation for strings in most modern platforms. Throughout the Windows API, this format is referred to as Unicode . This is somewhat imprecise, as there are numerous different Unicode formats. But since none were in widespread use at the time Windows first introduced Unicode support, Microsoft apparently felt that UTF-16 was an unnecessarily confusing name. But in general, when you see Unicode in either Windows or the .NET Framework, it means UTF-16.

From that, we can see that those IsNumber, IsLetter, IsHighSurrogate, and IsLowSurrogate methods correspond to tests for particular Unicode categories.

sb.append((char)c); c = fr.read(); } osw.write (sb.toString()); }

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You may ask: why do we need to know about encodings when it just works That s all very well for our in-memory representation of a string, but what happens when we save some text to disk, encrypt it, or send it across the Web as HTML We may not want the 16-bit Unicode encoding we ve got in memory, but something else. These encodings are really information interchange standards, as much as they are internal choices about how we represent strings.

Most XML documents, for example, are encoded using the UTF-8 encoding. This is an encoding that lets us represent any character in the Unicode codespace, and is compatible with ASCII for the characters in the 7-bit set. It achieves this by using variablelength characters: a single byte for the ASCII range, and two to six bytes for the rest. It takes advantage of special marker values (with the high bit set) to indicate the start of two to six byte sequences.

While UTF-8 and ASCII are compatible in the sense that any file that contains ASCII text happens to be a valid UTF-8 file (and has the same meaning whether you interpret it as ASCII or UTF-8), there are two caveats. First, a lot of people are sloppy with their terminology and will describe any old 8-bit text encoding as ASCII, which is wrong. ASCII is strictly 7-bit. Latin1 text that uses characters from the top-bit-set range is not valid UTF-8. Second, it s possible to construct a valid UTF-8 file that only uses characters from the 7-bit range, and yet is not a valid ASCII file. (For example, if you save a file from Windows Notepad as UTF-8, it will not be valid ASCII.) That s because UTF-8 is allowed to contain certain non-ASCII features. One is the so-called BOM (Byte Order Mark), which is a sequence of bytes at the start of the file unambiguously representing the file as UTF-8. (The bytes are 0xEF, 0xBB, 0xBF.) The BOM is optional, but Notepad always adds it if you save as UTF-8, which is likely to confuse any program that only understands how to process ASCII.

We re not going to look at any more details of these specific encodings. If you re writing an encoder or decoder by hand, you ll want to refer to the relevant specifications and vast bodies of work on their interpretation. Fortunately, for the rest of us mortals, the .NET Framework provides us with standard implementations of most of the encodings, so we can convert between the different representations fairly easily.

The int type (short for integer) represents whole numbers. That s clearly no use for our example, because we re dealing with numbers such as 5.14, and the closest that an int can get to that value is 5. But programs often deal with discrete quantities, such as the number of rows returned by a database query or the number of employees reporting to a particular manager. The principal advantage of an integer type is that it s exact: there s no scope for wondering if the number is really 5, or maybe just a number quite close to 5, such as 5.000001. Table 2-1 lists nine types capable of representing integers. The ninth, BigInteger, is a special case that we ll get to later. The other eight support four different sizes, with a choice between the ability and inability to represent negative numbers. Unsigned numbers may seem less flexible, but they are potentially useful if you need to represent values that should never be negative. However, the unsigned integer types are not widely used some programming languages don t support them at all, and so you ll find that the .NET Framework class library tends to use the signed types even

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