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C provides no such insulation between your code and physical memory. This gives you a great amount of freedom to access and manipulate data. It also places the responsibility of not overstepping boundaries on you, the programmer. Think of C pointers as Java object references with two principal differences. A C pointer can point to any kind of value or structure not just objects. You can declare a pointer to an integer, a float, a complex structure, a function, or even another pointer. Second, a C pointer is always a real memory location in the process s address space, whereas Java s object reference is an abstract and opaque value. Beyond that, most of the programming rules for Java references apply to pointers. For example, passing a pointer as a parameter copies the reference to the value, not the value itself. Since C provides both values and pointers to values, programming syntax must be used to distinguish between the two. The unary pointer operator (*) can appear in both type definitions and expressions. In a declaration, a pointer operator changes the variable type from a simple variable to a pointer to that type of variable, as shown in Listing 2-7.

Figures 3-36 through 3-39.One of the problems designers faced was making a shell that would not only protect and accommodate Robosapien s internals, but that would also be attractive to buyers. These drawings show the early development of what was to become the final design.

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The @class directive declares a class name without defining the class. It permits you to declare a reference to a class without having compiled the @interface for that class. Following a @class directive, you can refer to the class but you cannot compile any code that assumes knowledge about that class since the compiler has none. You can t send messages to an object of that class, or access any of its properties, until the actual @interface directive for that class is compiled. As soon as you start declaring variables that are pointers to objects, you ll discover that the compiler requires that those classes be defined before it will allow you to use the class name in a statement. The natural inclination is to just #import the needed class header files for every object you reference in your @interface directive. For smaller projects, that s fine. For large projects, this becomes a burden on the compiler (translation: it will slow down your development). Every class that uses class A will import its interface (#import "A.h"). If class A has instance variables that point to objects of classes B, C, and D, it will import all of those header files. If classes B, C, and D collectively contain references to classes E through N, their header files will import all of those header files, and so on. As the complexity of your project grows, the effort needed to compile each module grows geometrically. The @class directive can be used to lighten this load considerably. An @interface directive rarely needs to know anything about a referenced class other than it exists. A typical application of the @class directive is shown in Listing 3-13.

In 4, you used the MOVE, WAIT, and LOOP programming blocks to get the ExploroBot to complete its task. For the StringBot, you re going to use these same blocks. With the ExploroBot, you used the Ultrasonic Sensor, but with the StringBot, you re going to use the Sound Sensor. Just like you started doing in 4, I m going to ask you to refer back to your completed Design Journal page for the StringBot to help determine the proper blocks to use. Go ahead and get the StringBot Design Journal page out and open up the Lego Mindstorms NXT software (see Figure 8-1).

#import "Vehicle.h" @class Engine; @class MoonRoof; @class Radio; @interface Car : Vehicle { Engine *engine; MoonRoof *moonRoof; Radio *radio; }

(Photos courtesy of Mark Tilden, WowWee Ltd.)

- (void)startEngine; - (void)stopEngine; - (void)tuneRadio; @end The Car class contains references to Engine, MoonRoof, and Radio objects. A module that #imports this @interface can use the methods and properties of Car, but knows nothing about the other objects. The @implementation of Car, which presumably will use the other objects, begins by importing the full definition of those classes. As a rule, I #import the header file for the superclass, the class of all public objects, and the class of objects returned by methods (on the assumption that the caller will use the returned object). All remaining classes in the @interface are declared using @class. The @class directive also makes it possible to declare classes with circular references. In other words, class A has a reference to class B which has a reference to class A.

An Objective-C method has access to two predefined variables for referring to itself: self (this) and super (super). They work exactly like their Java counterparts, as shown in Listing 3-14.

(Photo courtesy of Mark Tilden, WowWee Ltd.)

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