系统级编程选择题集.doc

Multiple Choice Quiz 2 1 分数: 8/8 Which of the following could be represented by one bit of information?? 选择一个答案 a. the position of a light switch b. an ASCII character c. the color of a single pixel on a true-color computer display d. the current channel of a television receiver 正确 这次提交的分数：8/8。 Question 2 分数: 8/8 In C, what is the following binary number in hexadecimal?选择一个答案 a. 0xD5 b. 0xB5 c. 0xAB d. 0x5D 正确 这次提交的分数：8/8。 Question 3 分数: 8/8 What is the value of the following C expression?0x1234 ^ 0x5432 选择一个答案 a. 0x4606 b. 0x5636 c. 0x1030 d. 0x5434 正确 这次提交的分数：8/8。 Question 4 分数: 8/8 What is the value of the following C expression?0x1234 0x5432 选择一个答案 a. 0x1030 b. 0x1111 c. 0x5636 d. 0x6666 正确 这次提交的分数：8/8。 Question 5 分数: 8/8 How is 46 (decimal) represented in an 8-bit 2s complement binary format? 选择一个答案 a. b. c. d. 正确 这次提交的分数：8/8。 Question 6 分数: 8/8 How is -10 (decimal) represented in an 8-bit 2s complement binary format? 选择一个答案 a. b. c. d. 正确 这次提交的分数：8/8。 Question 7 分数: 8/8 In a computer with 4-byte words, which of the following C expressions tests whether ptr contains the address of a word?I. (ptr 3) == 0II. (ptr | 3) == 0III. (ptr % 4) == 0 选择一个答案 a. III only b. II only c. I only d. I and III only 正确 这次提交的分数：8/8。 Question 8 分数: 8/8 What happens in a C program when an addition would cause integer overflow?? 选择一个答案 a. The correct value is coerced to a floating point number. b. An incorrect result is produced and execution continues. c. An exception-handler is called with the two operands as parameters. d. Execution is terminated. 正确 这次提交的分数：8/8。 Question 9 分数: 8/8 What is the purpose of the exponent in floating point numbers?? 选择一个答案 a. to specify the superscript b. to specify the base as binary, octal, or hexadecimal