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To define a square, the class Square only needs to redefine the base class Rectangle constructor to have a single parameter representing the dimensions. The constructor calls the base constructor and passes the same dimension to the length and width. When Square is instantiated, the type will have the correct dimensions, and it would seem all s well in this object-oriented design. All isn t well, however, because a major design flaw exists, which the following test code illustrates: [TestFixture] public class TestShapes { [Test] public void TestConsistencyProblems() { Square square = newSquare( 10); Rectangle squarishRectangle = square; squarishRectangle.Length = 20; Assert.AreNotEqual( square.Length, square.Width); } } The variable square references a square with dimensions of 10 units. The variable square is downcast to the variable squarishRectangle, which is of the type Rectangle. Where the consistency problem occurs is when the squarishRectangle.Length property is assigned a value of 20. Even though it s legal to reassign the property, it isn t consistent with the requirements of the type Square. The Assert.AreNotEqual illustrates how the dimensions of the square are inconsistent and therefore not a square anymore. The problem is that polymorphism has caused consistency violations. One solution to make the Square consistent is the following source code: class Square : Rectangle { public Square( long width) : base( width, width) { } public override long Length { get { return base.Length; } set { base.Length = value; base.Width = value; } } public override long Width { get { return base.Width; }

Enable when you want to turn your system into an FTP server. Enable when you want to allow remote control over the desktop of your computer. Enable when you want to turn on SNMP monitoring so other systems can review vital statistics about your system. Enable when you want other users to access your printers. Enable when your system is a grid node of an XGrid deployment.

works. If your meter reads a negative voltage, you mixed up the wires somehow and you need to exchange them.

FTP has not changed in 30+ years. Need we say more Weak passwords and poor configuration could give an attacker access to everything on your computer. Others could gain too much information about your system if SNMP is not configured appropriately.

GUI developers will consider the current user interface of the example and think to themselves that maybe a better way to do the translation is to do the translation dynamically. So instead of pushing a button to do a translation, the textbox text changed event is captured and will translate whatever the contents of the textbox are. The translation results are then output in the other textbox.

Figure 7-9. Using the AA holder to measure battery voltage A simple battery tester program is shown in Figure 7-10. It classifies the battery quality into three bands. Above 1.45V, the battery is considered Fantastic; between 1.45V and 1.25V, it s Good; and below 1.25V, it s Low.

Apple Remote Desktop (VNC port 5900)

A possible way of doing a dynamic translation is to create a new textbox type that has built-in translation services. The new type is called TranslationTextBox and subclasses the type System.Windows.Forms.Textbox, which is defined as follows:

Remote Apple Events (SNMP ports 161 162)

Five volts isn t always a wide enough measurement range. Laboratory instruments have an output signal for connecting to other instruments that s in the range of 0V to +10V. Industrial sensors are often 10V to +10V. Automotive electronics are around 12V, and 9V is common in portable electronics such as the NXT itself.

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