ssd6选择题(已经尽量去重了)(总54页

1、Assessment Name: Multiple-Choice Quiz 1 1. Which of the following Visual C+ objects are contained within a Project? I.Files II.Visual C+ Solutions III.Flow charts (b) I, II and III (c) I only (d) II and III only Correct answer is (c) 2. Integrated programming environments make it difficult to mix an

2、d match tools from different sources. This is (a) good, because tools from different sources cannot be made to interact with each other (b) good, because it ensures compilation is not done incrementally by accident (c) bad, because all the tools will then have the same user interface (d) bad, becaus

3、e no single vendor is likely to be the source of all the best tools Correct answer is (d) 3. When debugging using Visual C+, which of the following are possible through the Watch window? I.The programs execution can be stopped. II.The value of an arbitrary C expression can be calculated. III.The val

4、ue of a program variable can be set. (a) II only (b) II and III only (c) III only (d) I, II, and III. Correct answer is (b) 4. When using a debugger to find the cause of a programs incorrect behavior, (a) it is often necessary to start the program multiple times under the debugger (b) the program is

5、 usually executed to the point at which the behavior occurs and then executed backwards to find the cause (c) it is fastest to start by stopping the debugger long before the behavior appears (d) the faulty code fragment must first be identified Correct answer is (a) 5. Consider the following program

6、. int i;int * jp = &i;int main(int i, char * argv) printf(%d %dn, (int) &i, (int) jp);Which of the following describes what it prints? (a) nothing: it will not compile because it is ambiguous (b) two integers that are exactly the same (c) two very different integers (d) two values, one 4 greater tha

7、n the other Correct answer is (c) 6. What is printed as a result of execution of the following program? #include void callee(int * count) (*count)+;int main (int argc, char *argv) int count = 4; callee(&count); printf(%d, count); return 0; (a) 4 (b) It cannot be determined from the information given

8、. (c) 8 (d) 5 Correct answer is (d) 7. (注意与6的区别） What does the following program print? void callee(int * count) (*count)+;int main (int argc, char *argv) int count = 4; callee(count); printf(%d, count); return 0; (a) 5 (b) nothing: it will not compile successfully (c) 8 (d) 4 Correct answer is (b)

9、8. Consider the following program. int i;int j = 1;int callee(int number) int plusone; plusone = number + 1; return plusone;int main (int argc, char *argv) if (j = 1) return callee(i); return j;Which of the following are allocated in the activation record immediately after the function callee() is i

10、nvoked? (a) plusone and number only. (b) i only. (c) plusone only. (d) i, j and number only. Correct answer is (a) 9. The Visual C+ Memory window displays (a) the contents of memory, interpreted as 32-bit integers, without the associated variable names (b) the names and values of variables in memory

11、, interpreted as 32-bit integers no matter what the variables types (c) the contents of memory, interpreted in one of several ways, without the associated variable names (d) the names and values of variables in memory, interpreted in one of several ways Correct answer is (c) 10. In a computer in whi

12、ch both addresses and integers are 32 bits wide, how many bytes of memory will the compiler allocate for following code fragment? int a;int * b = &a; (a) 32 (b) 4 (c) 0 (d) 8 Correct answer is (d) 11. Which of the following are true of the effect that optimizations have on the machine code generated

13、 by compilers? I.The resulting code will be faster and/or smaller. II.The resulting code will be clearer. III.The resulting code will be harder to debug. (a) I and II only (b) I only (c) I, II, and III (d) I and III only Correct answer is (d) 12. Which of the following computations may be performed

14、by exactly one CPU instruction? I.a = 5; II.a = b + c * 5; III.for (i = 0; i msg x y;cout x + y;Which of the following is (are) true regarding execution of the segment? I.The input statement will always take the same amount of time to execute. II.The output statement will always be executed immediat

15、ely after the input statement. III.If x and y are both positive, an integer greater than both will be printed. (a) I and II only (b) none (c) II and III only (d) II only Correct answer is (b) 27.When using a debugger to find the cause of a programs incorrect behavior, (a) the program is usually exec

16、uted to the point at which the behavior occurs and then executed backwards to find the cause (b) the faulty code fragment must first be identified (c) it is fastest to start by stopping the debugger long before the behavior appears (d) it is often necessary to start the program multiple times under

17、the debugger Correct answer is (d) 28.Consider the following program. int square(int * arg) int n = * arg; return n * n;int main (int argc, char * argv) int arg = strtol(argv1, NULL, 0); return square(arg);When it is executed with the argument 5, the variable n is allocated to (a) many addresses cho

18、sen by the compiler. (b) exactly one address chosen by the compiler. (c) exactly one address not known to the compiler. (d) many addresses neither of which are known to the compiler. Correct answer is (c) 29. Consider the following code fragment. int a;int b;int main(int argc, char *argv) int c; int

19、 d; . /* some code */Which of the following must be true? (a) The value of *d is closer to the value of *c than to the value of *a. (b) The values of *a and *b are closer to each other than the values of *c and *d. (c) The value of &d is closer to the value of &c than to the value of &a. (d) The val

20、ues of &a and &b are closer to each other than the values of &c and &d. Correct answer is (c) 30. Which of the following is a good reason (are good reasons) to equip the CPU with small amounts of fast memory? I.To make the design of the compiler simpler II.To make some CPU instructions smaller III.T

21、o make some CPU instructions faster (a) III only (b) I, II, and III (c) II only (d) II and III only Correct answer is (d) 31.Immediately after the CPU executes an instruction that is neither a branch nor a jump instruction, the program counter (a) has a value that cannot be determined without furthe

22、r information (b) is incremented to point to the following instruction (c) remains unchanged (d) is incremented by one Correct answer is (b) 32.A branch instruction (a) sets the program counter to one of two possible values (b) sets the program counter to one of many possible values (c) increases th

23、e program counter by a fixed amount (d) unconditionally sets the program counter to its operand Correct answer is (a) 33.Compared to a sequence of machine code instructions, a fragment of C code (a) may describe the same algorithm (b) describes the actions of the computer, not just of the CPU (c) is

24、 the native way to program most computers (d) does not engage any transistors during its execution Correct answer is (a)35.When executing a function callee(), which of the following are true regarding the value of the frame pointer? I.It marks the top of the stack frame of the function that invoked

25、callee(). II.It marks the bottom of the stack frame of callee() III.It is the top of the stack. (a) I and II only (b) III only (c) II only (d) I only Correct answer is (a) 36.At which of the following times is an activation record created? I.When a program starts executing. II.Every time a function

26、is invoked. III.When a variable is declared. (a) III only (b) I and II only (c) II and III only (d) II only Correct answer is (b) 37.In one computer, the bytes with addresses A, A+1, A+2 and A+3 contain the integer 256, and the variable declared with int * a; has the value A. In a different computer

27、, the bytes with addresses B, B+1, B+2 and B+3 also contain the integer 256, and the variable declared with int * b has the value B. Which of the following are necessarily true? I.The contents of A+1 are equal to the contents of B+1. II.The contents of A+1 are equal to the contents of B+2. III.*a =

28、*b (a) II and III only (b) I and III only (c) I only (d) III only Correct answer is (d)38.The program counter contains (a) the address of the CPU instruction that is about to be executed (b) the number of CPU instructions a program has executed so far (c) the amount of memory a program is currently

29、using (d) the number of times a program has been executed Correct answer is (a) 39.Within Visual C+, which of the following will reveal the value of a variable when the program is stopped at a breakpoint? I.Placing the mouse pointer over the variable name in the source file window. II.Inserting a pr

30、intf() in the program. III.Typing the variable name on the Watch window. (a) III only (b) I and III only (c) I, II, and III (d) II and III only Correct answer is (b) 40.A CPU register is a word of CPU memory that (a) is explicitly loaded and unloaded from normal memory by compiler-generated instruct

31、ions (b) records the results of periodic CPU diagnostics (c) houses a critical variable for the duration of the execution of a program (d) is automatically loaded when a CPU instruction refers to a word of normal memory Correct answer is (a) 40. Compared to a sequence of machine code instructions, a

32、 fragment of C code (a) does not engage any transistors during its execution(b) may describe the same algorithm(c) describes the actions of the computer, not just of the CPU(d) is the native way to program most computersCorrect answer is (b)41. Which of the following must be true if a program is sto

33、pped at a specific line within the Visual C+ debugger? I. There is at least one breakpoint enabled. II. There is a breakpoint enabled on that line. III. There is a breakpoint enabled on the line preceding that line.(a) I only(b) I and II only(c) I and III only(d) noneCorrect answer is (d)42. A jump

34、instruction (a) increases the program counter(b) changes the program counter only if its operand is equal to zero(c) unconditionally sets the program counter to its operand(d) changes a pointer to point to the next element of an arrayCorrect answer is (c)43. Which of the following is able to describ

35、e a computation at the highest level of abstraction? (a) logic Gates(b) machine code(c) C+ code(d) C codeCorrect answer is (c)44. How many return addresses does a C function have as a program executes? (a) one(b) as many as the number of times it is invoked(c) as many as the number of return stateme

36、nts within the function(d) two, one for each branchCorrect answer is (b)42. Which of the following statements properly allocates an array of 100 integers? (a) int A = new int100;(b) int *A = new (int) 100;(c) int *A = new int100;(d) int &A = new int100;Correct answer is (c)43. Valid comments in C+ i

37、nclude which of the following? 1. /* comment */ 2. / comment 3. / comment(a) I and III only(b) I and II only(c) II and III only(d) I, II, and IIICorrect answer is (a)44. Each of the following is a basic C+ type except (a) bool(b) char(c) unsigned int(d) byteCorrect answer is (d)45. Which of the foll

38、owing statements might be produced by the decomposition of a problem into objects and relationships? 1. A is a type of B 2. A B contains a C(a) I and II(b) None(c) II only(d) I onlyCorrect answer is (a)46. Suppose inf is an available ifstream and c is an available character. Consider the following c

39、ode fragment. do c = inf.get(); while (!inf.eof() & isspace(c);Which of the following accurately describes the effect of executing this fragment?(a) Characters are read until the end of the file is reached.(b) Characters are read until a non-white-space character is read or until the end of the file

40、 is reached.(c) The number of non-white-space characters is counted.(d) Characters are read until a white space is read.Correct answer is (b)47. In C+, the standard input stream is accessible using the object _, and the standard output stream is accessible using the object _.(a) stdin, stdout(b) keyboard, screen(c) input, output(d) cin, coutCorrect answer is (d)48. Consider the following C+ program segment. #include #include using namespace std; int main(int argc, char* argv) return EXIT_SUCCESS; The first two lines of this program segment typica