SSD5单选题答案

View Assessment Result: Multiple-Choice Quiz 2
Your performance was as follows:
1. Suppose a user-defined class Thing has a simple constructor that does not require
any calls to new. Which of the following is true about the destructor?
(a) It will not contain calls to delete.
(b) It might contain calls to delete, but might not.
(c) In this case, no destructor is required for class Thing.
(d) The appropriate destructor will be provided automatically by the compiler. Correct answer is (b)
Your score on this question is: 10.00
Feedback:
See section 1.4.3 of the course notes.
(b)
2. Each of the following C++ code fragments produces a memory leak except:
(a) int *A = new int[5]; A = new int[5]; delete [] A;
(b) int *A = new int[10]; delete [] A;
(c) int *A = new int[5]; A = 0; delete [] A;
(d) int *A = new int[10]; delete A;
Correct answer is (b)
Your score on this question is: 0.00
Feedback:
See section 1.4.3 of the course notes.
(d)
3. What, if anything, is wrong with the following code fragment?
Thing *ptr = new Thing;
ptr = NULL;
(a) When executed, it will create an instance of Thing and then overwrite it with
NULL.
(b) When executed, it will create an instance of Thing and then remove the only
reference to this instance without destroying it first.
(c) When executed, it will assign a NULL pointer to a variable that is a pointer to a
Thing.
(d) Nothing
Correct answer is (b)
Your score on this question is: 0.00
Feedback:
See section 1.4.3 of the course notes.
(d)
4. Which of the following is true about the default parameter passing mechanism in
C++?
(a) It is call-by-value.
(b) It is chosen automatically by the compiler.
(c) It depends on where the function is defined.
(d) It is call-by-reference.
Correct answer is (a)
Your score on this question is: 0.00
Feedback:
See section 1.4.2 of the course notes.
(b)
5. Which of the following statements is true about a reference used as a function
parameter?
(a) It cannot be used in a function prototype.
(b) It is not as efficient as using a pointer.
(c) It passes a copy of the object.
(d) It allows a function to modify the original object passed in as the argument. Correct answer is (d)
Your score on this question is: 0.00
Feedback:
See section 1.4.2 of the course notes.
(c)
6. Which of the following statements creates p as an alternative name for the
variable i?
(a) int &p = i;
(b) int *p = &i;
(c) int &p = *i;
(d) int *p = i;
Correct answer is (a)
Your score on this question is: 0.00
Feedback:
See section 1.4.2 of the course notes.
(d)
7. Which of the following C++ operators is the address-of operator?
(a) %
(b) !
(c) *
(d) &
Your score on this question is: 10.00
Feedback:
See section 1.4.1 in the course notes.
(d)
8. Which of the following declares p to be a pointer to an integer?
(a) int **p;
(b) int p[]
(c) int *p;
(d) int p;
Correct answer is (c)
Your score on this question is: 10.00
Feedback:
See section 1.4.1 of the course notes.
(c)
9. Which of the following operations are valid for C++ pointer arithmetic?
I.Addition
II.Subtraction
III.Multiplication
(a) I, II, and III
(b) I only
(c) II only
(d) I and II only
Your score on this question is: 10.00
Feedback:
See section 1.4.1 in the course notes.
(d)
10. Which of the following C++ operators is the dereference operator?
(a) %
(b) !
(c) &
(d) *
Correct answer is (d)
Your score on this question is: 0.00
Feedback:
See section 1.4.1 in the course notes.
(c)
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Total score: 40.00
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