课程名称：计算机概论 课程性质：选修 课程教师：陈彦仰 开课学院：电机资讯学院 开课系所：资讯工程学系 考试日期〈年月日〉：2011.11.22 考试时限〈分钟〉：120分钟 是否需发放奖励金：是 〈如未明确表示，则不予发放〉 试题： Part I: Multiple Choice Problems(21 points) Circle the letter of the choice that best completes the statement or answers the question. 1. Who designed the ENIAC? a. Alan Turing b. John von Neumann c. J. Presper Eckert and John William Mauchly d. Gordon Moore 2. Which programming language was invented after C++? a. Java b. Python c. C# d. all of the above 3. Which command can be used to find all users currently using the same machine? a. getpath b. who c. whereis d.find 4. How many bits are used to encode each symbol in ASCII code? a. 4 b. 6 c. 8 d. 9 5. Which is a volatile storage? a. Hard disk b. DRAM c. Floppy d. Flash memory 6. Which storage has the lowest latency? a. L1 cache b. L2 cache c. SDRAM d. Hard drive 7. How does Windows manage multiple processes? a, time-sharing b. event-driven c. distribute d. virtualization Part II: Alphabet Soup(20 points) For each terminology, spell it out completely, and explain (in either Chinese or English) briefly. 1. USB 2. DNS 3. GPU 4. SMTP 5. HTTP Part III: Short Answers(37 points) Answer the following questions briefly but clearly. 1. (5 points)Write a regular expression that defines the official email address of all NTU freshmen ([email protected] , x represents a number between 0-9) 2. (5 points)What are the major function of a computer operating system? 3. (5 points)Consider a simple 8-bit computer, what is the range of binary number that can be represented using 2's complement encoding? 4. (5 points)Please explain what is the little-endian and big-endian format? 5. (5 points)Please explain briefly the "Y2K38" problem. 6. (12 points)Write the Linux commands for performing the following tasks: A. Renaming the file "source.txt" to "target.txt" B. Defining a new command "delete" that removes files and directories. C. Listing all files whose names start with "Quiz" D. Listing all environment variables Part IV: Turing Machine (10 points) Draw the state diagrams of the Turing Machine you designed. Question: Let any given positive number n be represented in binary but without leading zeros. (eg. 2 is _ _ 1 0 _ _ not _ _ 0 1 0 _ _ or 0 0 1 0 _ _) Design a Turing Machine to do "multiply 2 to the number and then add 1" (which means output 2n+1) with the smallest number of states. (The number of states must be less than 5) Part V: Python Programming (20 points) Please answer the following questions of python language. 1. (5 points)Can the following program work?If yes, write down the value of R1. If no, please explain why and correct the program. A=[1,3,2] R1=A.sort() 2. (5 points)Can the following program work?If yes, write down the value of R2. If no, please explain why and correct the program. A=(1,3,2) R2=A.sort() 3. (10 points)Write a program that outputs a user's birth city based on the following table. (Eg. After reading the letter "A" from stdin, the program will output "Taipei City" to stdout.) ┌────┬────┬────┬────┬─────┬─────┐ │A │B │C │D │E │F │ ├────┼────┼────┼────┼─────┼─────┤ │Taipei │Taichung│Keelung │Tainan │Kaohsiung │New Taipei│ │City │City │City │City │City │City │ └────┴────┴────┴────┴─────┴─────┘ -- Ans: Part I: 1.c 2.d 3.b 4.c 5.b 6.a 7.a or b Note: For 7th question, both answers are acceptable, time-sharing is mainly for Linux, and event-driven are used by Windows) Part II: 1. Universal Serial Bus USB was designed to standardize the connection of computer peripherals, such as keyboards, pointing devices, digital cameras, printers, portable media players, disk drives and network adapters to personal computers, both to communicate and to supply electric power. 2. Domain Name System / Domain Name Service DNS is a hierarchical distributed naming system for computers, services, or any resource connected to the Internet or private network. 3. Graphics Processing Unit GPU is a specialized circuit designed to rapidly manipulate and alter memory in such a way so as to accelerate the building of images in a frame buffer intended for output to a display. 4. Simple Mail Transfer Protocol SMTP is an Internet standard for electronic mail (e-mail) transmission across Internet Protocol (IP) networks. 5. Hypertext Transfer Protocol HTTP is an application protocol for distributed, collaborative, hypermedia information systems. HTTP is the foundation of data communication for the World Wide Web. Part III: 1. In ERE: b00[0-9]{6}@ntu\.edu\.tw 2. memory management, process management, storage & I/O managementm (graphical) user interface, network management, security etc. 3. -128 ~ 127 4. The term endian or endianness refers to the ordering of individually addressable sub-components within the representation of a larger data item as stored in external memory (or, sometimes, as sent on a serial connection). A big-endian machine stores the most significant byte first (at the lower byte address), and a little=endian machine stores the least significant bye first. 5. The buid-in time of computer starts from 1970-01-01 00:00 and counts seconds with an integer counter. Since 32-bit integer has a upper bound as 2^31-1, the couunter will overflow after 2^31-1 seconds. The overflow would happen on 2038- 01-19 03:14:07, and after the moment, the time would go back to 1901-12-13 20:45:52, making potential problems. 6. A. mv source.txt target.txt B. In bash shell: alias delete="rm -rf" C. ls Quiz* D. In bash shell: export Part IV: (1,1,→) (_,1,→) ┌───┐┌───┐ │ ↓│ ↓ ○ ○ ○ │↑ │↑ └┘ └┘ (_,_,→) (1,1,→) (0,0,→) Part V: 1. Yes, R1=[1,2,3] 2. No, tuple can't be modified. Tuple is immutable! We can use list instead or just create a new tuple! R2=(A[0], A[2}, A[1}) 3. dir={"A":"Taipei City","B":"Taichung City","C":"Keelung City","D":"Tainan City","E":"Kauhsiung City","F":"New Taipei City"} in=raw_input("Please type the first letter of your ID: ") print dir[in] --

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