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Although methods with a return type of void are not rare, most methods will return a value In fact, the ability to return a value is one of a method s most useful features You have already seen an example of a return value when we used the MathSqrt( ) function in 3 to obtain a square root Return values are used for a variety of purposes in programming In some cases, such as with MathSqrt( ), the return value contains the outcome of some calculation In other cases, the return value may simply indicate success or failure In still others, it may contain a status code Whatever the purpose, using method return values is an integral part of C# programming Methods return a value to the calling routine using this form of return: return value; Here, value is the value returned You can use a return value to improve the implementation of AreaPerPerson( ) Instead of displaying the area-per-person, a better approach is to have AreaPerPerson( ) return this value Among the advantages to this approach is that you can use the value for other calculations The following example modifies AreaPerPerson( ) to return the area-perperson rather than displaying it:

// Return a value from AreaPerPerson() using System; class Building { public int Floors; // number of floors public int Area; // total square footage of building public int Occupants; // number of occupants // Return the area per person public int AreaPerPerson() { return Area / Occupants; } }

It is, in fact, possible to extend the PictureBox control to provide this support. You can override the Paint event to draw an image with the proper aspect ratio much like we do in this chapter, and scroll bars can be added using the ScrollBar class. We do not take this approach here since we want to discuss forms and panels, so the PictureBox control is no longer needed. 15 displays a properly proportioned image within a PictureBox control, and chapter 18 provides a short discussion on how to create a custom control incorporating this functionality.

6:

80 0015 0003

Set the version number of the MyPhotos application to 7 .2. DELETE THE PICTUREBOX CONTROL Action 1 2 Display the MainForm.cs [Design] window. Delete the PictureBox control.

// Use the return value from AreaPerPerson() class BuildingDemo { static void Main() { Building house = new Building(); Building office = new Building(); int areaPP; // area per person // Assign values to fields in house houseOccupants = 4; houseArea = 2500; houseFloors = 2; // Assign values to fields in office officeOccupants = 25; officeArea = 4200; officeFloors = 3; // Obtain area per person for house areaPP = houseAreaPerPerson(); ConsoleWriteLine("house has:\n " + houseFloors + " floors\n " + houseOccupants + " occupants\n " + houseArea + " total area\n " + areaPP + " area per person");

ConsoleWriteLine(); // Obtain area per person for office areaPP = officeAreaPerPerson(); ConsoleWriteLine("office has:\n " + officeFloors + " floors\n " + officeOccupants + " occupants\n " + officeArea + " total area\n " + areaPP + " area per person"); } }

The control no longer appears on the form. In the MainForm.cs file, the definition for the control (the pbxPhoto variable) and all references to it in the InitializeComponent method are removed. Note: nonautomated references to this variable must be removed by hand. This will be done during the course of this section.

The output is the same as shown earlier In the program, notice that when AreaPerPerson( ) is called, it is put on the right side of an assignment statement On the left is a variable that will receive the value returned by AreaPerPerson( ) Thus, after

Select the Delete item from the control s context menu, or simply click on the control and press the Delete key.

areaPP = houseAreaPerPerson();

executes, the area-per-person of the house object is stored in areaPP Notice that AreaPerPerson( ) now has a return type of int This means that it will return an integer value to the caller The return type of a method is important because the type of data returned by a method must be compatible with the return type specified by the method Thus, if you want a method to return data of type double, then its return type must be type double