Computer Science Illuminated

Computer Science Illuminated

Language: English

Pages: 700

ISBN: 1284055914

Format: PDF / Kindle (mobi) / ePub

Each new print copy includes Navigate 2 Advantage Access that unlocks a comprehensive and interactive eBook, student practice activities and assessments, a full suite of instructor resources, and learning analytics reporting tools. Fully revised and updated, the Sixth Edition of the best-selling text Computer Science Illuminated retains the accessibility and in-depth coverage of previous editions, while incorporating all-new material on cutting-edge issues in computer science. Authored by the award-winning Nell Dale and John Lewis, Computer Science Illuminated’s unique and innovative layered approach moves through the levels of computing from an organized, language-neutral perspective. Designed for the introductory computing and computer science course, this student-friendly Sixth Edition provides students with a solid foundation for further study, and offers non-majors a complete introduction to computing. Key Features of the Sixth Edition include: Access to Navigate 2 online learning materials including a comprehensive and interactive eBook, student practice activities and assessments, learning analytics reporting tools, and more Completely revised sections on HTML and CSS Updates regarding Top Level Domains, Social Networks, and Google Analytics All-new section on Internet management, including ICANN control and net neutrality New design, including fully revised figures and tables New and updated Did You Know callouts are included in the chapter margins New and revised Ethical Issues and Biographies throughout emphasize the history and breadth of computing Available in our customizable PUBLISH platform A collection of programming language chapters are available as low-cost bundling options. Available chapters include: Java, C++, Python, Alice, SQL, VB.NET, RUBY, Perl, Pascal, and JavaScript. With Navigate 2, technology and content combine to expand the reach of your classroom. Whether you teach an online, hybrid, or traditional classroom-based course, Navigate 2 delivers unbeatable value. Experience Navigate 2 today at

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and let 50 through 99 represent the negative numbers Љ50 through Љ1. Let’s take the number line and number the negative values on the top according to this scheme: 50 51 –50 –49 ... 97 98 99 0 1 2 3 –3 –2 –1 0 1 2 3 ... 48 49 48 49 To perform addition within this scheme, you just add the numbers together and discard any carry. Adding positive numbers should be ok; 3.2 Representing Numeric Data 59 let’s try adding a positive number and a negative number, a negative

number and a positive number, and two negative numbers. These are shown below in sign-magnitude and in this scheme. (Note that the carries are discarded.) Sign-Magnitude New Scheme 5 +–6 –1 5 + 94 99 + –4 6 2 –2 +–4 –6 + 96 6 2 98 + 96 94 What about subtraction, using this scheme for representing negative numbers? The key is in the relationship between addition and subtraction: A Љ B = A + (ЉB). We can subtract one number from another by adding the negative of the second to the first.

amounts of data associated with video. The goal therefore is not to lose information that affects the viewer’s senses. Most codecs are block oriented, meaning that each frame of a video is divided into rectangular blocks. The codecs differ in how the blocks are encoded. Some video codecs are accomplished completely in software, while others require special hardware. Video codecs employ two types of compression: temporal and spatial. Temporal compression looks for differences between consecutive

This is definitely an algorithm. Of course, it is easier to follow an algorithm than it is to devise one. Let’s reorganize this recipe and present it in the algorithm format we used previously. Put butter in a pot Turn on burner Put pot on the burner While (NOT bubbling) Leave pot on the burner Put other ingredients in the blender Turn on blender While (more butter) Pour butter into blender in slow stream Turn off blender 6.2 Top-Down Design 151 As we said in Chapter 5, computing has its

to collabo- 6.3 Object-Oriented Design rate with a calendar object, so we need a calendar class. Should every person have this responsibility? No, probably not. Let’s derive another class from person called guest. Class Name: Guest Superclass: Person Responsibilities Collaborations Respond to invitation OdateB Date, calendar Subclasses: We leave this general example at this stage and go on to a more concrete example. Computer Example Once again, let’s repeat the problem-solving

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