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Abstract methods are part of abstract classes and are methods that must be implemented in derived classes. Abstract classes are described in 6. Listing 9-62 contains an example of an abstract method. Listing 9-62. An Abstract Method abstract class BaseCalculator { protected abstract int CalculateProduct(int x, int y); protected abstract int CalculateSum(int x, int y); public int PerformCalculation(int x, int y, bool calcProduct) { if (calcProduct) { return CalculateProduct(x, y); } else { return CalculateSum(x, y); } } } The BaseCalculator class in Listing 9-62 contains two abstract methods, shown in bold. Abstract methods can be added only to an abstract class (which is a class modified by the abstract keyword). Abstract methods are created by applying the abstract keyword as a modifier. Abstract methods are like virtual methods, except that the base class doesn t provide an implementation. Abstract classes can contain regular methods, and these methods can call abstract methods, as demonstrated by the PerformCalculation method, which uses one of the two abstract methods based on a parameter value. You can t create an instance of an abstract class, only a derived class that implements all the abstract methods. Listing 9-63 shows a class that does just this. Listing 9-63. Providing Implementations of Abstract Methods class CalcImpl : BaseCalculator { protected override int CalculateProduct(int x, int y) { return x * y; }

This last set of methods returns a MapEntry instance instead of a key Thus, you don t have to do the secondary lookup operation So, there are six new methods for the new operations mentioned in the second set, as follows:.

protected override int CalculateSum(int x, int y) { return x + y; } } Implementing an abstract method is just like overriding a virtual method. You use the override keyword, match the signature of the method, and provide an implementation of the method. (When you implement an abstract method, you can t use the base keyword to call the base class implementation of the method; there isn t one, of course, and the C# compiler will generate an error.) The class in Listing 9-63 provides implementations of both of the abstract methods in the base class. We can create instances of this derived class and treat it either as an instance of the base class or as an instance of the derived class, like this: // create an new CalcImpl BaseCalculator calc = new CalcImpl(); // perform some calculations int result1 = calc.PerformCalculation(10, 20, true); int result2 = calc.PerformCalculation(10, 20, false); // print out the results Console.WriteLine("Result1: {0}", result1); Console.WriteLine("Result2: {0}", result2); Compiling and running the two classes from Listings 9-61 and 9-62, and these statements produce the following results: Result1: 200 Result2: 30 Press enter to finish If a derived class doesn t implement all the abstract methods in a base class, then the derived class must also be declared as abstract. Derived classes can choose to implement some of the abstract methods and even seal them so that further derived classes cannot provide their own implementations. Listing 9-64 contains an example. Listing 9-64. Selectively Implementing Abstract Methods abstract class SelectiveImpl : BaseCalculator { protected sealed override int CalculateProduct(int x, int y) { return x * y; } } class FinalCalculator : SelectiveImpl { protected override int CalculateSum(int x, int y) { return x + y;

Based on this discussion, how do you go about pro table segment marketing There are several rules: Build a customer database with demographics and transaction history. Find a reliable way to get regular updates on transactions and responses. Come up with a pro table method for creating customer segments that you can market to. Select just a few segments and design a marketing program for each segment. Set up control groups that have exactly the same characteristics as the groups selected for marketing, but that do not get the promotional material. Measure the performance of the segment that received the promotion against that of the control group. In the marketing campaign for each segment, use the database to create personalized content: emails, direct-mail pieces, telephone calls, Web response pages, and so on. Monitor the response from each segment and each response method and record them in the database. Constantly test new methods of marketing to each segment, recording the results and increasing the resources devoted to those methods that work.

} } The first class, SelectiveImpl, in Listing 9-64 implements just one of the abstract methods that we defined in Listing 9-62, but it also uses the sealed modifier, meaning that derived classes cannot provide their own implementations of this method. Since this class doesn t implement all the abstract methods of its base class, it is an abstract class, too. The second class, FinalCalculator, is derived from SelectiveImpl. If we want to create a class that we can create instances of, we must implement the remaining abstract method, but we can t implement the sealed method. We have to accept the implementation of the SelectiveImpl class.