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A ROADMAP After reading this chapter, you should realize that there is much more to computer science than simply writing programs. Like any professional, a computer scientist must have an understanding of all of the subdisciplines of the field. Some of the major disciplines of computer science are algorithms, programming, programming languages, computer hardware, networking, operating systems, database systems, distributed computing, and the ethical issues surrounding the use of computer technology. There are two major schools of thought when it comes to the education of computer scientists. The depth-first approach is to study one particular topic in depth. For example, many computer science degree programs start out with a course in programming. After taking such a course, students will be proficient programmers, but clearly they will not have enough knowledge of the other subdisciplines of the field to be considered computer scientists. A second approach is to cover many of the subdisciplines of computer science, but only to the depth required to teach a basic understanding of the principles of each discipline. After obtaining an overall view of the field, students will then study certain subdisciplines in depth. This is referred to as the breadth-first approach, and is the approach we chose to use in this book. The organization of this text follows the description of computing given in the first section of this chapter. It begins with a discussion of algorithms, how they are developed, and how they may be compared. We also introduce a formal model of computation. After reading this chapter you will have a basic understanding of algorithm development and will be able to develop algorithms to solve simple problems. After studying algorithms, the text will focus on the basics of computer hardware. In this chapter you will learn what the major components of the computer are and how they work together. You will also learn about the binary number system and see how it can be used to encode information at the hardware level. The next two chapters will focus on programming. We will first study software in general and discuss how high-level languages can be constructed to provide models in which algorithms can be expressed, and ultimately expressed in a way that the hardware can work with. In the next chapter we will focus on programming using the programming language Java. The goal of this chapter is not to make you an expert programmer, but instead to introduce you to the basics of programming using a language that is readily available and in wide use. After learning the fundamentals of programming we will focus on operating systems, networking, and databases. The topics covered in these chapters will address common techniques used to manage computer hardware, provide access to network resources, and manage and store data. Almost every modern computer application uses the technologies discussed in these chapters. The last chapter in the book will discuss some of the social issues of computing. In this chapter we will discuss intellectual property rights and conflicts, privacy of data, hacking, and viruses. We will also discuss our professional responsibilities when lives depend on the systems on which we work. REVIEW QUESTIONS 1.1 Write an algorithm for your morning routine, from the time the alarm clock rings until you leave the house for work or school. 1.2 Find or invent an algorithm to calculate the square root of any number. Apply the algorithm to the number 2046, finding its square root to 2 decimal places. Do not use a computer or calculator! 1.3 Perl is a computer language that is often used for quick, one-off programming jobs, like converting text in a document from one format to another. ADA is a language used for Department of Defense applications where human life may be at stake. What differences would you imagine to find when you compare Perl with ADA 1.4 Why might a computer scientist with a primary interest in databases also need to know about networking 1.5 The acronym API stands for Application Programming Interface. What do you suppose API means with respect to an operating system
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