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Notice the last line in the output When the value 10 is left-shifted 30 times, information is lost because bits are shifted out of the range of an int In this case, the garbage value produced is negative because a 1 bit is shifted into the high-order bit, which is used as a sign bit, causing the number to be interpreted as negative This illustrates why you must be careful when using the shift operators to multiply or divide a value by 2 (See 3 for an explanation of signed vs unsigned data types)

1 Did you select an appropriate organizational structure 2 Does your message ow easily from paragraph to paragraph and from section to section 3 Have you included any attachments, appendices, or corollary documents (such as a brochure) that you refer to in the body of your communication 4 Have you considered the level of detail that s appropriate to include and are you providing it 5 For those units of information that require detail, have you fully explained everything that needs to be described, outlined, or summarized 6 Have you included all footnotes and endnotes that are referred to in the body of your communication 7 If your document comprises multiple sections, are they consistently numbered and formatted 8 If your document comprises multiple sections, are you including a table of contents, and is it correct 9 Stop and think: Are you missing any pertinent units of information 10 Reread your communication once again focusing on the overall message Is it clear

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Overridden methods allow C# to support runtime polymorphism Polymorphism is essential to object-oriented programming for one reason: It allows a general class to specify methods that will be common to all of its derivatives, while allowing derived classes to define the specific implementation of some or all of those methods Overridden methods are another way that C# implements the one interface, multiple methods aspect of polymorphism Part of the key to applying polymorphism successfully is understanding that the base classes and derived classes form a hierarchy that moves from lesser to greater specialization Used correctly, the base class provides all elements that a derived class can use directly Through virtual methods, it also defines those methods that the derived class can implement on its own This allows the derived class flexibility, yet still enforces a consistent interface Thus, by combining inheritance with overridden methods, a base class can define the general form of the methods that will be used by all of its derived classes

Part I:

To better understand the power of virtual methods, we will apply them to the TwoDShape class In the preceding examples, each class derived from TwoDShape defines a method called Area( ) This suggests that it might be better to make Area( ) a virtual method of the TwoDShape class, allowing each derived class to override it, defining how the area is calculated for the type of shape that the class encapsulates The following program does this For convenience, it also adds a name property to TwoDShape (This makes it easier to demonstrate the classes)

// Use virtual methods and polymorphism using System; class TwoDShape { double pri_width; double pri_height; // A default constructor public TwoDShape() { Width = Height = 00; name = "null"; } // Parameterized constructor public TwoDShape(double w, double h, string n) { Width = w; Height = h; name = n; } // Construct object with equal width and height public TwoDShape(double x, string n) { Width = Height = x; name = n; } // Construct a copy of a TwoDShape object public TwoDShape(TwoDShape ob) { Width = obWidth; Height = obHeight; name = obname; } // Properties for Width and Height public double Width { get { return pri_width; } set { pri_width = value < 0 -value : value; } } public double Height { get { return pri_height; } set { pri_height = value < 0 -value : value; } }

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