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Methods
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As explained, instance variables and methods are two of the primary constituents of classes So far, the Building class contains data, but no methods Although data-only classes are perfectly valid, most classes will have methods Methods are subroutines that manipulate the data defined by the class and, in many cases, provide access to that data Typically, other parts of your program will interact with a class through its methods A method contains one or more statements In well-written C# code, each method performs only one task Each method has a name, and it is this name that is used to call the method In general, you can name a method using any valid identifier that you please However, remember that Main( ) is reserved for the method that begins execution of your program Also, don t use C# s keywords for method names When denoting methods in text, this book has used and will continue to use a convention that has become common when writing about C# A method will have parentheses after its name For example, if a method s name is GetVal, then it will be written GetVal( ) when its name is used in a sentence This notation will help you distinguish variable names from method names in this book The general form of a method is shown here: access ret-type name(parameter-list) { // body of method } Here, access is an access modifier that governs what other parts of your program can call the method As explained earlier, the access modifier is optional If not present, then the method is private to the class in which it is declared For now, we will declare methods as public so that they can be called by any other code in the program The ret-type specifies the type of data returned by the method This can be any valid type, including class types that you create If the method does not return a value, its return type must be void The name of the method is specified by name This can be any legal identifier other than those that would cause conflicts within the current declaration space The parameter-list is a sequence of type
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6:
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Introducing Classes and Objects
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and identifier pairs separated by commas Parameters are variables that receive the value of the arguments passed to the method when it is called If the method has no parameters, then the parameter list will be empty
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PART I
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Add a Method to the Building Class
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As just explained, the methods of a class typically manipulate and provide access to the data of the class With this in mind, recall that Main( ) in the preceding examples computed the area-per-person by dividing the total area by the number of occupants Although technically correct, this is not the best way to handle this computation The calculation of area-per-person is something that is best handled by the Building class, itself The reason for this conclusion is easy to understand: The area-per-person of a building is dependent upon the values in the Area and Occupants fields, which are encapsulated by Building Thus, it is possible for the Building class to perform this calculation on its own Furthermore, by adding this calculation to Building, you prevent each program that uses Building from having to perform this calculation manually This prevents the unnecessary duplication of code Finally, by adding a method to Building that computes the area-per-person, you are enhancing its object-oriented structure by encapsulating the quantities that relate directly to a building inside Building To add a method to Building, specify it within Building s declaration For example, the following version of Building contains a method called AreaPerPerson( ) that displays the area-per-person for a building:
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// Add a method to Building using System; class Building { public int Floors; // number of floors public int Area; // total square footage of building public int Occupants; // number of occupants // Display the area per person public void AreaPerPerson() { ConsoleWriteLine(" " + Area / Occupants + " area per person"); } } // Use the AreaPerPerson() method class BuildingDemo { static void Main() { Building house = new Building(); Building office = new Building();
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// Assign values to fields in house houseOccupants = 4; houseArea = 2500; houseFloors = 2; // Assign values to fields in office officeOccupants = 25;
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Part I:
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