吉林大学计算机导论复习重点.doc
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1、Chapter 1 Computer and DataKnowledge point:1.1 The computer as a black box.1.2 von Neumann model 1.3 The components of a computer: hardware, software, and data. 1.4 The history of computers.REVIEW QUESTIONS1. How is computer science defined in this book?A:Issues related to the computer.2. What model
2、 is the basis for todays computers? ( Knowledge point 1.2)A:The von Neumann model.3. Why shouldnt you call a computer a data processor? ( Knowledge point 1.1)A:Computer is general-purpose machine. it can do many different types of tasks.4. What does a programmable data processor require to produce o
3、utput data? ( Knowledge point 1.1)A:The input data and the program.5. What are the subsystems of the von Neumann computer model? ( Knowledge point 1.2)A:Memory, arithmetic logic unit, control unit, and input/output.6. What is the function of the memory subsystem in von Neumanns model? ( Knowledge po
4、int 1.2)A:Memory is the storage area. It is where programs and data are stored during processing.7. What is the function of the ALU subsystem in von Neumanns model? ( Knowledge point 1.2)A:ALU is where calculation and logical operations take place.8. What is the function of the control unit subsyste
5、m in von Neumanns model? ( Knowledge point 1.2)A:It controls the operations of the memory, ALU, and the input/output subsystem.9. What is the function of the input/output subsystem in von Neumanns model? ( Knowledge point 1.2)A:The input subsystem accepts input data and the program from outside the
6、computer; the output subsystem sends the result of processing to the outside.10. Compare and contrast the memory contents of early computers with the memory contents of a computer based on the von Neumann model? ( Knowledge point 1.2)A:Computer based on the von Neumann model stores both the program
7、and its corresponding data in the memory. Early computers only stored the data in the memory.11. How did the von Neumann model change the concept of programming? ( Knowledge point 1.2)A:A program in the von Neumann model is made of a finite number of instructions. The instructions are executed one a
8、fter another.12. The first electronic special-purpose computer was called c ( Knowledge point 1.4)a. Pascal b. Pascaline c. ABC d. EDVAC13. One of the first computers based on the von Neumann model was called d ( Knowledge point 1.4)a. Pascal b. Pascaline c. ABC d. EDVAC14. The first computing machi
9、ne to use the idea of storage and programming was called d ( Knowledge point 1.4)a. the Madeline b. EDVAC c. the Babbage machine d. the Jacquard loom15. d separated the programming task from the computer operation tasks. ( Knowledge point 1.3)a. Algorithms b. Data processors c. High-level programmin
10、g languages d. Operating systems30. According to the von Neumann model, can the hard disk of today be used as input or output? Explain. ( Knowledge point 1.2)A:Yes. When the hard disk stores data that results from processing, it is considered an output device; when you read data from the hard disk,
11、it is considered an input device.32. Which is more expensive today, hardware or software? ( Knowledge point 1.3)A:Software.Chapter 2 Data RepresentationKnowledge point:2.1 Data Types.2.2 Data inside the Computer.2.3 Representing Data.2.4 Hexadecimal and Octal notation.REVIEW QUESTIONS1. Name five ty
12、pes of data that a computer can process. ( Knowledge point 2.1)A:Numbers, text, images, audio, and video.2. How does a computer deal with all the data types it must process? ( Knowledge point 2.2)A:All data types are transformed into bit pattern.3.4. What is the difference between ASCII and extended
13、 ASCII? ( Knowledge point 2.3)A:ASCII is a bit pattern made of 7 bits and extended ASCII is a bit pattern made of 8 bits.5. What is EBCDIC? ( Knowledge point 2.3)A:Extended Binary Coded Decimal Interchange Code.6. How is bit pattern length related to the number of symbols the bit pattern can represe
14、nt? ( Knowledge point 2.3)A:The relationship is logarithmic.7.8.9. What steps are needed to convert audio data to bit patterns? ( Knowledge point 2.3)A:Sampling, Quantization, and Coding.10. What is the relationship between image data and video data? ( Knowledge point 2.3)A:Video is a representation
15、 of images in time.34. A company has decided to assign a unique bit pattern to each employee. If the company has 900 employees, what is the minimum number of bits needed to create this system of representation? How many patterns are unassigned? If the company hires another 300 employees, should it i
16、ncrease the number of bits? Explain your answer. ( Knowledge point 2.3)A:log290010, 210-900=124, Yes, 900+300210Chapter 3 Number RepresentationKnowledge point:3.1 Convert a number from decimal, hexadecimal, and octal to binary notation and vice versa.3.2 Integer representation: unsigned, sign-and-ma
17、gnitude, ones complement, and twos complement.3.3 Excess system.3.4 Floating-point representation.REVIEW QUESTIONS5. What are three methods to represent signed integers? (Knowledge point 3.2) A:Sign-and-Magnitude, Ones Complement, and Twos Complement.9. Name two uses of unsigned integers. ( Knowledg
18、e point 3.2)A:Counting and Addressing.10. What happens when you try to store decimal 130 using sign-and-magnitude representation with an 8-bit allocation? ( Knowledge point 3.2)A:Overflow.11. Compare and contrast the representation of positive integers in sing-and-magnitude, ones complement, and two
19、s complement. ( Knowledge point 3.2)A:The representation of positive integers in sing-and-magnitude, ones complement, and twos complement is the same.14. Compare and contrast the range of numbers that can be represented in sign-and-magnitude, ones complement, and twos complement. ( Knowledge point 3
20、.2)A:Sign-and-Magnitude range (2N-1-1)+(2N-1-1) Ones Complement range (2N-1-1)+(2N-1-1) Twos Complement range (2N-1)+(2N-1-1)16. What is the primary use of the Excess_X system? ( Knowledge point 3.3) A:The primary use of the Excess_X system is in storing the exponential value of a fraction.17. Why i
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