Schaum’s Outline Series OF Principles of Computer Science phần 7 pps

... relation consists of rows, each of which represents an instance of the entity type, and of columns, each of which represents one of the attributes of the entity type. Each row of a relation is ... row more often than tuple, but a tuple is a row of a table, an instance of a relation, an instance of an entity type. Each tuple consists of the values of the attributes fo...

Ngày tải lên: 12/08/2014, 21:22

... most modern computers. 4 INTRODUCTION TO COMPUTER SCIENCE [CHAP. 1 SCHAUM’S OUTLINE OF Principles of COMPUTER SCIENCE CARL REYNOLDS Department of Computer Science Rochester Institute of Technology PAUL ... Jones (http://www.cs.uiowa.edu/~jones/cards/history.html). SCHAUM’S OUTLINE OF Principles of COMPUTER SCIENCE CHAPTER 1 Introduction to Computer S...

Ngày tải lên: 12/08/2014, 21:22

... but in computer science, because of the ubiquity of binary math, this is usually written as lg n, meaning logarithm to the base 2 of n. The total running time T of the merge sort consists of the ... million units of time, but solving the problem for a matrix of 50 entries will require about a million billion units of time. If a unit of time is a millionth of a second, t...

Ngày tải lên: 12/08/2014, 21:22

... is a pattern of ones and zeros stored in a word of computer memory. By the way, a “word” of memory is the basic unit of storage for a computer. A 16-bit computer has a word size of 16 bits, or ... handling of data is appropriate. CPU/ALU The CPU is the part of the computer one thinks of first when describing the components of a computer. The repetitive cycle of the...

Ngày tải lên: 12/08/2014, 21:22

... as part of the state of each individual car (part of the state of each instance). On the other hand, we would maintain a count of the total number of Automobiles as part of the state of the class ... ((cdr n)), a list of one element (the element is another list, the cdr of the list of parameters), and the second line of cond would return a list instead of a number. O...

Ngày tải lên: 12/08/2014, 21:22

... problem occupied a great deal of computer science research during the 1960s, 1 970 s, and 1980s. Several solutions have been developed. Dekker offered the first software solution to the problem ... operating system of a computer is a program, often called the “kernel,” which is always running on the computer, and which governs the execution of all the other programs that run on t...

Ngày tải lên: 12/08/2014, 21:22

... a logical page number. Since the number of frames of physical memory is likely to be much smaller than the number of pages of logical memory in a 64-bit computer (with 4K pages, 2 52 = way too ... invention of the 20th century had the most impact on the way in which people live their lives, a person might answer by saying, “computers.” Clearly the computer and the application o...

Ngày tải lên: 12/08/2014, 21:22

... $535 billion, or 5.24 percent of the total GDP of the United States. If one also includes the dependent industries, the total jumps to $79 1 billion and 7. 75 percent of GDP. The copyright industries ... subquery returns any rows ALL True if all of a set of comparisons are true ANY True if any one of a set of comparisons is true SOME True if some of a set of comparisons is...

Ngày tải lên: 12/08/2014, 21:22

... theirs, and to their peace of mind, regardless of the quality of their locks. Software professionals should never condone the spreading of viruses, Trojan horses, or worms. The ACM Code of Ethics provides ... base-2: 37 470 1220 17 99 100101 111010110 10011000100 10001 1100011 3.6 Convert the following base-2 numbers to base-10: 00000111 7 10101010 170 00111001 57 0101010...

Ngày tải lên: 12/08/2014, 21:22

... 46 compiler, 10, 47- 8 computer science, definition, 1 computer virus, 175 – 176 computer word data representation in, 33–36 size, 32–33, 39 computing history, 4–12 copyright, 173 – 174 CPU (Central ... 150–1 57 EBNF (extended Backus-Naur form), 61–62 Eckert, J. Presper, 11 encapsulation, 52, 78 encryption, 175 ENIAC (Electronic Numerical Integrator Analyzer and Computer) , 11 et...

Ngày tải lên: 12/08/2014, 21:22