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block In the first form, the object is declared outside the using statement In the second form, the object is declared within the using statement When the block concludes, the Dispose( ) method (defined by the SystemIDisposable interface) will be called on obj Dispose( ) is called even if the using block ends because of an exception Thus, a using statement provides a means by which objects are automatically disposed when they are no longer needed Remember, the using statement applies only to objects that implement the SystemIDisposable interface Here is an example of each form of the using statement:

// Demonstrate using statement using System; using SystemIO; class UsingDemo { static void Main() { try { StreamReader sr = new StreamReader("testtxt"); // Use object inside using statement using(sr) { // } } catch(IOException exc) { // } try { // Create a StreamReader inside the using statement using(StreamReader sr2 = new StreamReader("testtxt")) { // } } catch(IOException exc) { // } } }

and our limit equals 4e4x 4 4x x 0 4e ( 1 + 4x) 4 lim Again the numerator and denominator tend to zero and we apply l'H pital's Rule; the limit equals 16e4x 1 = 4x ( 2 + 4x) 2 x 0 16e lim

The class StreamReader implements the IDisposable interface (through its base class TextReader) Thus, it can be used in a using statement When the using statement ends, Dispose( ) is automatically called on the stream variable, thus closing the stream As the preceding example illustrates, using is particularly useful when working with files because the file is automatically closed at the end of the using block, even if the block ends because of an exception As a result, closing a file via using often simplifies file-handling code Of course, using is not limited to just files There are many other resources in the NET Framework that implement IDisposable All can be managed via using

Part I:

The first use of extern indicates that a method is provided by unmanaged code that is not part of the program In other words, that method is supplied by external code To declare a method as external, simply precede its declaration with the extern modifier The declaration must not include any body Thus, the general form of an extern declaration is as shown here: extern ret-type meth-name(arg-list); Notice that no braces are used In this use, extern is often used with the DllImport attribute, which specifies the DLL that contains the method DllImport is in the SystemRuntimeInteropServices namespace It supports several options, but for most uses, it is sufficient to simply specify the name of the DLL that contains the extern method In general, extern methods should be coded in C (If you use C++, then the name of the method within the DLL might be altered with the addition of type decorations) To best understand how to use extern methods, it is helpful to work through an example The example consists of two files The first is the C file shown here, which defines a method called AbsMax( ) Call this file ExtMethc

Sometimes a factorization helps to clarify a subtle limit:

#include <stdlibh> int __declspec(dllexport) AbsMax(int a, int b) { return abs(a) < abs(b) abs(b) : abs(a); }

The AbsMax( ) method compares the absolute values of its two parameters and returns the maximum Notice the use of __declspec(dllexport) This is a Microsoft-specific extension to the C language that tells the compiler to export the AbsMax( ) method within the DLL that contains it You must use this command line to compile ExtMethc

This creates a DLL file called ExtMethdll Next is a program that uses AbsMax( ):

In Microsoft Word, for example, pressing shift and F7 brings up the synonym nder Highlight the word or phrase you re trying to replace and consider your options Once you ve found a synonym, you can dig deeper for other related words By clicking on look up, you re able to discover subtle relationships between words that may lead you to ideas that you otherwise might not have considered When you toss a rock into still water, circles radiate out As you move from one word to another, the relationship between the words is like this ripple effect in the water As you consider Hannah s list of alternatives to highest, note that there are subtle differences in the meaning of each word Here s the list she came up with: nest best most excellent preeminent astral stratospheric top-drawer superior top