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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; // Error, can't access private member } // Display a triangle's style public void ShowStyle() { ConsoleWriteLine("Triangle is " + Style); } }

Plot the points P = ( 3, 2) , Q = ( 4, 6) , R = ( 2, 5) , and S = ( 5, 3)

The Triangle class will not compile because the use of Width and Height inside the Area( ) method is illegal Since Width and Height are now private, they are accessible only to other members of their own class Derived classes have no access to them

outside its class, including derived classes At first, you might think that it is a serious restriction that derived classes do not have access to the private members of base classes because it would prevent the use of private members in many situations However, this is not true; C# provides various solutions One is to use protected members, which is described in the next section A second is to use public properties to provide access to private data As explained in the previous chapter, a property allows you to manage access to an instance variable For example, you can enforce constraints on its values, or you can make the variable read-only By making a property public, but declaring its underlying variable private, a derived class can still use the property, but it cannot directly access the underlying private variable Here is a rewrite of the TwoDShape class that makes Width and Height into properties In the process, it ensures that the values of Width and Height will be positive This would allow you, for example, to specify the Width and Height using the coordinates of the shape in any quadrant of the Cartesian plane without having to first obtain their absolute values

// Use public properties to set and get private members using System; // A class for two-dimensional objects

The first coordinate 3 of the point P tells us that the point is located 3 units to the right of the y-axis (because 3 is positive) The second coordinate 2 of the point P tells us that the point is located 2 units below the x-axis (because 2 is negative) See Figure 17 The first coordinate 4 of the point Q tells us that the point is located 4 units to the left of the y-axis (because 4 is negative) The second coordinate 6 of the point Q tells us that the point is located 6 units above the x-axis (because 6 is positive) See Figure 17 The first coordinate 2 of the point R tells us that the point is located 2 units to the right of the y-axis (because 2 is positive) The second coordinate 5 of the point R tells us that the point is located 5 units above the x-axis (because 5 is positive) See Figure 17 The first coordinate 5 of the point S tells us that the point is located 5 units to the left of the y-axis (because 5 is negative) The second coordinate 3 of the point S tells us that the point is located 3 units below the x-axis (because 3 is negative) See Figure 17

Part I:

21:

Method public static bool TryParse(string s, out int result)

It s important to understand each organizational structure s strengths and when to use each one Each of the nine structures suggests a framework Once you begin to work with the structures, you ll see how adhering to the standards streamlines and simpli es the entire writing process