vb.net barcode font 7: Pointers and Parameters in Java

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CHAPTER 7: Pointers and Parameters
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Figure 7-2 shows the results of this search, a catalog entry for Albert Einstein s famous book on relativity, called The Meaning of Relativity. Take a minute to look over the figure. Pay special attention to the catalog number located just above the book title. The catalog number for this book is 530.1. This number tells you exactly where to find the book among all the other books on the shelves. The books are ordered numerically, so you ll find this book in the 500 shelves, between 530 and 531.
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Figure 7-2. Here s a catalog entry for our rather famous book. Note the catalog number, just above the book s title. This book can be found on the library shelf between section 530 and 531.
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In this example, the library bookshelves are like your computer s memory, with the books acting as data. The catalog number is the address of your data (a book) in memory (on the shelf ). As you might have guessed, the catalog number acts as a pointer. The library catalogs use these pointers to rearrange all the books in the library, without moving a single book. Think about it. If you search the catalog by subject, it s just as if all the books in the library are arranged by subject. Physically, the book arrangements have nothing to do with subject. The books are arranged numerically by catalog number. By adding a layer of pointers between you and the books, the librarians achieve an extra layer of flexibility. In the same way, if you search the catalog by title, it s just as if all the books in the library are arranged alphabetically by title. Again, physically, the book arrangements have nothing to do with title. By using pointers, all the books in the library are arranged in different ways without ever leaving the shelves. The books are arranged physically (sorted by catalog number) and logically (sorted in by author, subject, title, and so on). Without the support of a layer of pointers, these logical book arrangements would be impossible.
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CHAPTER 7: Pointers and Parameters
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Adding a layer of pointers is also known as adding a level of indirection. The number of levels of indirection is the number of pointers you have to use to get to your library book (or to your data).
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Checking Out of the Library
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So far, we ve talked about pointers in terms of library catalog numbers. The use of pointers in your C programs is not much different from this model. Each catalog number points out the location of a book on the library shelf. In the same way, each pointer in your program will point out the location of a piece of data in computer memory. If you wrote a program to keep track of your DVD collection, you might maintain a list of pointers, each one of which might point to a block of data that describes a single DVD. Each block of data might contain such information as the name of the movie, the name of the director, the year of release, and a category (for example, drama, comedy, documentary). If you got more ambitious, you could create several pointer lists. One list might sort your DVDs alphabetically by movie title. Another might sort them chronologically by year of release. Yet another list might sort your DVDs by category. You get the picture. There s a lot you can do with pointers. By mastering the techniques presented in these next few chapters, you ll be able to create programs that take full advantage of pointers. The goal for this chapter is to help you master pointer basics. We ll talk about C pointers and C pointer operations. You ll learn how to create a pointer and how to make the pointer point to a variable. You ll also learn how to use a pointer to change the value of the variable the pointer points to.
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