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Contents of nums: 1 4 -1 5 -9 nums contains a negative value First negative value is : -1

In the program, the method passed to Exists( ) and Find( ) for the predicate is IsNeg( ) Notice that IsNeg( ) is declared like this:

static bool IsNeg(int v) {

In this chapter, you learned two tools to improve your rst drafts You were able to add specificity by integrating numbers, facts, statistics, and examples, and you discovered how to select words and phrases using the principle of FURY as a guide In the next chapter, you re going to learn ve important strategies for ensuring that even your most complex communications emphasize your key points concisely

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The methods Exists( ) and Find( ) will automatically pass the elements of the array (in sequence) to v Thus, each time IsNeg( ) is called, v will contain the next element in the array

The Action delegate is used by ArrayForEach( ) to perform an action on each element of an array There are various forms of Action, each taking a different number of type parameters The one used here is public delegate void Action<in T> (T obj) The object to be acted upon is passed in obj When used with ForEach( ), each element of the array is passed to obj in turn Thus, through the use of ForEach( ) and Action, you can, in a single statement, perform an operation over an entire array The following program demonstrates both ForEach( ) and Action It first creates an array of MyClass objects, and then uses the method Show( ) to display the values Next, it uses Neg( ) to negate the values Finally, it uses Show( ) again to display the negated values These operations all occur through calls to ForEach( )

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// Demonstrate an Action using System; class MyClass { public int i; public MyClass(int x) { i = x; } } class ActionDemo {

// An Action method // It displays the value it is passed static void Show(MyClass o) { ConsoleWrite(oi + " "); } // Another Action method // It negates the value it is passed static void Neg(MyClass o) { oi = -oi; } static void Main() { MyClass[] nums = new MyClass[5]; nums[0] nums[1] nums[2] nums[3] nums[4] = = = = = new new new new new MyClass(5); MyClass(2); MyClass(3); MyClass(4); MyClass(1);

ConsoleWrite("Contents of nums: "); // Use action to show the values ArrayForEach(nums, ActionDemoShow); ConsoleWriteLine(); // Use action to negate the values ArrayForEach(nums, ActionDemoNeg); ConsoleWrite("Contents of nums negated: "); // Use action to negate the values again ArrayForEach(nums, ActionDemoShow); ConsoleWriteLine(); } } Contents of nums: 5 2 3 4 1 Contents of nums negated: -5 -2 -3 -4 -1

Part II:

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In programming, one often needs to convert a built-in data type into an array of bytes For example, some hardware device might require an integer value, but that value must be sent one byte at a time The reverse situation also frequently occurs Sometimes data will be received as an ordered sequence of bytes that needs to be converted into one of the built-in types For example, a device might output integers, sent as a stream of bytes Whatever your conversion needs, NET provides the BitConverter class to meet them BitConverter is a static class It contains the methods shown in Table 21-13 It defines the following field: public static readonly bool IsLittleEndian This field is true if the current environment stores a word with the least significant byte first and the most significant byte last This is called little-endian format IsLittleEndian is false if the current environment stores a word with the most significant byte first and the least significant byte last This is called big-endian format Intel Pentium based machines use little-endian format