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Arthur Arthur Arthur Arthur Arthur Arthur is is is is is is at at at at at at (0,0) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle 1.57 radians. (-25,10) and is pointing at angle 1.57 radians. (-25,10) and is pointing at angle 0.79 radians. (-27.5,7.5) and is pointing at angle 0.79 radians.

OK, that seems fine for basic operation. But what happens if we change the width of the platform to zero

The following code shows an example of the declaration of a class called C1 that contains a property named MyValue. Notice that the property itself does not have any storage. Instead, the accessors determine what should be done with data sent in, and what data should be sent out. In this case, the property uses a field called TheRealValue for storage. The set accessor takes its input parameter, value, and assigns that value to field TheRealValue. The get accessor just returns the value of field TheRealValue. Figure 6-9 illustrates the code. class C1 { private int TheRealValue; public int MyValue { set { TheRealValue = value; } get { return TheRealValue; } } }

Turtle arthurTheTurtle = new Turtle { PlatformWidth = 0.0, PlatformHeight = 10.0, MotorSpeed = 5.0 };

Not only does that not make much sense, but the output is not very useful either; clearly we have divide-by-zero problems:

Arthur Arthur Arthur Arthur Arthur Arthur is is is is is is at at at at at at (0,0) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle Infinity radians. (NaN,NaN) and is pointing at angle Infinity radians. (NaN,NaN) and is pointing at angle NaN radians. (NaN,NaN) and is pointing at angle NaN radians.

Clearly, our real-world turtle could go badly wrong if we told it to rotate through an infinite angle. At the very least, we d get bored waiting for it to finish. We should prevent the user from running it if the PlatformWidth is less than or equal to zero. Previously, we used the following code:

You write to and read from a property in the same way you access a field. The accessors are called implicitly. To write to a property, use the property s name on the left side of an assignment statement. To read from a property, use the property s name in an expression. For example, the following code contains an outline of the declaration of a property named MyValue. You write to and read from the property using just the property name, as if it were a field name. int MyValue { set{ ... } get{ ... } } ... Property name MyValue = 5; z = MyValue; Property name // Property declaration

// Run the turtle for the specified duration public void RunFor(double duration) {

Figure 8.4 shows the interaction between the Application object and one of its child components. Client components are usually instantiated in the init stage of the client page lifecycle and initialized before the load stage is entered. This means that when the load event is raised, client components are already initialized and ready for use. Finally, components are disposed during the unload stage by the Application object.

if (PlatformWidth <= 0.0) { // What to do here } } // ...

That detects the problem, but what should we do if our particular turtle is not set up correctly Previously, we silently ignored the problem, and returned as though everything was just fine. Is that really what we want to do For this application it might be perfectly safe, but what if another developer uses our turtle with a paintbrush strapped to its back, to paint the lines on a tennis court The developer added a few extra moves at the beginning of his sequence, and he didn t notice that he had inadvertently done so before he initialized the PlatformWidth. We could have a squiggly paint disaster on our hands!

The System.Double type defines a number of constant values that are used to represent some very interesting doubles: Double.NaN is the result of dividing zero by zero (e.g., 0.0/0.0). Double.NegativeInfinity is the result of dividing a negative number by zero (e.g., 1.0/0.0). Double.PositiveInfinity is the result of dividing a positive number by zero (e.g., 1.0/0.0). They also behave in interesting ways. For example, you can t compare one of these special values with another (e.g., (0.0/0.0 != Double.NaN)). Instead, you have to use helper methods such as these: Double.IsNaN(0.0/0.0) Double.IsPositiveInfinity(1.0/0.0) Double.IsNegativeInfinity(-1.0/0.0) If you don t care whether it is a positive or a negative infinity, just some sort of infinity, you can use this helper: Double.IsInfinity(1.0/0.0). Be very careful when playing with infinities, as you can easily get into trouble!

// Assignment: the set method is implicitly called // Expression: the get method is implicitly called

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