TAILIEUCHUNG - Computer Programming for Teens phần 2

Trong Windows 2000, chúng tôi sử dụng một đĩa sửa chữa khẩn cấp, và trong Windows XP, chúng tôi sử dụng tự động hưng toàn bộ báo cáo là sai bởi vì chúng ta có một sai lệch về một bên và Trong ví dụ cuối cùng, 28 12 nhưng 28 không phải là | 16 Chapter 1 First Things First Here is another version of the same program in Pascal. program printmessage var x integer first_phrase string begin first_phrase Could you please say that again for x 0 to 250 do begin writeln first_phrase x x 1 end end Each of these examples could have been written in any language. The main point of these programs is that they both contain a loop which is another way of saying that a particular task is being executed over and over again. The point of showing both of these programs is to focus on how they are similar rather than their language differences. As you move through the chapters that follow keep in mind that languages will always change to suit the development of technology. Certain concepts remain the same regardless of language. If you learn these concepts well you will have no problem becoming a serious programmer. Summary We looked at the basics of the computer including its hardware and software. We examined the computer as an electronic machine that can recognize changes in states of on and off these states represent the basis of the digitization of information for the computer. Programming relies on the ability to write clear step-by-step solutions called algorithms in a language. Some languages are high-level and easy to use while other languages are more difficult to learn because they are low-level and closer to the machine s understanding. In Chapter 2 we will look at the first major concept of programming understanding variables. CHAPTER 2 Variables The Holders of Information In this chapter you will learn about variables which are used to hold data. Since we use computers primarily to manipulate data we need to begin the study of programming with learning about variables. We will examine the different kinds of data and how variables are classified according to the data they hold. Once you understand variables you can begin to learn about programming statements which are the fundamental building blocks of .

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