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This expression transforms the index passed in index into a zero-based index suitable for use on a This expression works whether lowerBound is positive, negative, or zero The ok( ) method is shown here:
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// Return true if index is within bounds private bool ok(int index) { if(index >= lowerBound & index <= upperBound) return true; return false; }
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It is similar to the one used by FailSoftArray except that the range is checked by testing it against the values in lowerBound and upperBound RangeArray illustrates just one kind of custom array that you can create through the use of indexers and properties There are, of course, several others For example, you can create dynamic arrays, which expand and contract as needed, associative arrays, and sparse arrays You might want to try creating one of these types of arrays as an exercise
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CHAPTER
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nheritance is one of the three foundational principles of object-oriented programming because it allows the creation of hierarchical classifications Using inheritance, you can create a general class that defines traits common to a set of related items This class can then be inherited by other, more specific classes, each adding those things that are unique to it In the language of C#, a class that is inherited is called a base class The class that does the inheriting is called a derived class Therefore, a derived class is a specialized version of a base class It inherits all of the variables, methods, properties, and indexers defined by the base class and adds its own unique elements
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C# supports inheritance by allowing one class to incorporate another class into its declaration This is done by specifying a base class when a derived class is declared Let s begin with an example The following class called TwoDShape stores the width and height of a twodimensional object, such as a square, rectangle, triangle, and so on
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// A class for two-dimensional objects class TwoDShape { public double Width; public double Height; public void ShowDim() { ConsoleWriteLine("Width and height are " + Width + " and " + Height); } }
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TwoDShape can be used as a base class (that is, as a starting point) for classes that describe specific types of two-dimensional objects For example, the following program uses TwoDShape to derive a class called Triangle Pay close attention to the way that Triangle is declared
Part I:
The C# Language
// A simple class hierarchy using System; // A class for two-dimensional objects class TwoDShape { public double Width; public double Height; public void ShowDim() { ConsoleWriteLine("Width and height are " + Width + " and " + Height); } } // Triangle is derived from TwoDShape class Triangle : TwoDShape { public string Style; // style of triangle // Return area of triangle public double Area() { return Width * Height / 2; } // Display a triangle's style public void ShowStyle() { ConsoleWriteLine("Triangle is " + Style); } } class Shapes { static void Main() { Triangle t1 = new Triangle(); Triangle t2 = new Triangle(); t1Width = 40; t1Height = 40; t1Style = "isosceles"; t2Width = 80; t2Height = 120; t2Style = "right"; ConsoleWriteLine("Info for t1: "); t1ShowStyle(); t1ShowDim(); ConsoleWriteLine("Area is " + t1Area()); ConsoleWriteLine(); ConsoleWriteLine("Info for t2: "); t2ShowStyle(); t2ShowDim();
11:
Inheritance
ConsoleWriteLine("Area is " + t2Area()); } }
PART I
The output from this program is shown here:
Info for t1: Triangle is isosceles Width and height are 4 and 4 Area is 8 Info for t2: Triangle is right Width and height are 8 and 12 Area is 48
The Triangle class creates a specific type of TwoDShape, in this case, a triangle The Triangle class includes all of TwoDShape and adds the field Style, the method Area( ), and the method ShowStyle( ) A description of the type of triangle is stored in Style; Area( ) computes and returns the area of the triangle; and ShowStyle( ) displays the triangle style Notice the syntax that Triangle uses to inherit TwoDShape:
class Triangle : TwoDShape {
This syntax can be generalized Whenever one class inherits another, the base class name follows the name of the derived class, separated by a colon In C#, the syntax for inheriting a class is remarkably simple and easy to use Because Triangle includes all of the members of its base class, TwoDShape, it can access Width and Height inside Area( ) Also, inside Main( ), objects t1 and t2 can refer to Width and Height directly, as if they were part of Triangle Figure 11-1 depicts conceptually how TwoDShape is incorporated into Triangle Even though TwoDShape is a base for Triangle, it is also a completely independent, stand-alone class Being a base class for a derived class does not mean that the base class cannot be used by itself For example, the following is perfectly valid:
TwoDShape shape = new TwoDShape(); shapeWidth = 10; shapeHeight = 20; shapeShowDim();
Of course, an object of TwoDShape has no knowledge of or access to any classes derived from TwoDShape
FIGURE 11-1
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