第2章-数据表示.doc

Chapter 2 Data Representation By 黄永平，权勇，孙永雄，王智，丰小月，孙铭会 Knowledge point: 2.1 Data Types. 2.2 Data inside the Computer. 2.3 Representing Data. 2.4 Hexadecimal and Octal notation. REVIEW QUESTIONS Name five types of data that a computer can process. ( Knowledge point 2.1) A：Numbers, text, images, audio, and video. 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. What is the difference between ASCII and extended 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. What is EBCDIC? ( Knowledge point 2.3) A：Extended Binary Coded Decimal Interchange Code. How is bit pattern length related to the number of symbols the bit pattern can represent? ( Knowledge point 2.3) A：The relationship is logarithmic. What steps are needed to convert audio data to bit patterns? ( Knowledge point 2.3) A：Sampling, Quantization, and Coding. What is the relationship between image data and video data? ( Knowledge point 2.3) A：Video is a representation of images in time. MULTIPLE-CHOICE QUESTIONS 11. Which of the following can be classified as data? ( Knowledge point 2.1) d a. numbers b. video c. audio d. all of the above 12. To store a byte, you need d electronic switches. ( Knowledge point 2.2) a. 1 b. 2 c. 4 d. 8 13. A byte consists of c bits. ( Knowledge point 2.2) a. 2 b. 4 c. 8 d. 16 14. In a set with 64 symbols, each symbol requires a bit pattern length of c bits. ( Knowledge point 2.3) a. 4 b. 5 c. 6 d. 7 15. How many symbols can be represented by a bit pattern with 10 bits? ( Knowledge point 2.3) d a. 128 b. 256 c. 512 d. 1024 16. In extended ASCII, each symbol is b bits. ( Knowledge point 2.3) a. 7 b. 8 c. 9 d. 10 17. If the ASCII code for