Question

1.Suppose that the goop function from the previous question changes the value of z[1]. Does this change effect the value of the actual argument?

• A. Yes
• B. No

2.Here is a function declaration:

    void goo(int* x)
    {
        *x = 1;
    }

Suppose that a is an int* variable pointing to some integer, and *a is equal to zero. What is printed if you print *a after the function call goo(a)?

• A. 0
• B. 1
• C. address of a
• D. address of x
• E. None of the above

3.Here is a small function that uses the dynamic bag class from Chapter 4:

    void quiz( )
    {
        bag::size_type i;   // Line 1
        bag b;              // Line 2

        b.insert(42);       // Line 3
        i = b.size( );      // Line 4
        cout << i;    // Line 5
    }

When is the bag's dynamic array allocated?

• A. During the execution of Line 2.
• B. During the execution of Line 3.
• C. Just after Line 4 and before line 5.
• D. After Line 5.

4.Here is a small function that uses the dynamic bag class from Chapter 4:

    void quiz( )
    {
        bag::size_type i;  // Line 1
        bag b;             // Line 2

        b.insert(42);      // Line 3
        i = b.size( );     // Line 4
        cout << i;   // Line 5
    }

When is the bag's dynamic array returned to the heap?

• A. During the execution of Line 2.
• B. During the execution of Line 3.
• C. Just after Line 4 and before line 5.
• D. After Line 5.

5.The + operator which combines two bags was not declared as a member function of the bag class. How can this function access the private data members of the two bags passed as arguments?

• A. It cannot.
• B. The operator is declared to be a friend to the class.
• C. The operator is implemented in the header file containing the bag class definition.
• D. The operator is implemented in the same implementation file as the bag class.

6.Suppose that a new foo class has this prototype for an overloaded assignment operator:

    void operator =(const foo& source);

In an assignment statement a = b, what will be the actual argument for the parameter source?

• A. a
• B. b

7.Suppose you are implementing an assignment operator, a copy constructor, and an operator +=. For which of these functions do you need to worry about possible "self-application" (where the argument is the same as the object that activates the function):

• A. Only one of the three functions has possible self-application
• B. The assignment operator and the copy construtor have possible self-application
• C. The assignment operator and the operator += have possible self-application
• D. The copy construtor and the operator += have possible self-application
• E. All three functions have possible self-application

8.What is the usual worst-case performance for resizing a container class that stores its data in a dynamic array?

• A. Constant time
• B. Logarithmic time
• C. Linear time
• D. Quadratic time

9.When a class uses dynamic memory, what member functions should be provided by the class?

• A. The assignment operator.
• B. The copy constructor.
• C. A destructor.
• D. All of the above.

10.Which situation does not use the copy constructor?

• A. Calling a function with a reference parameter
• B. Calling a function with a value parameter
• C. Declaring a variable to be a copy of another existing object
• D. Returning a value from a function
• E. All of the above situations use the copy constructor

11.Suppose that you want to declare an array of characters to hold a C++ string with exactly 9 letters. Which declaration is best?

• A. char s[8];
• B. char s[9];
• C. char s[10];
• D. char s[11];
• E. char s[12];

12.Suppose that x and y are two C++ strings. Which expression will return true whenever x and y contain the same sequence of characters?

• A. (x = y)
• B. (x == y)
• C. (x != y)
• D. (strcmp(x, y))

13.Suppose that you want to develop two different + operators that calculate and return an object of some class. Which statement is correct?

• A. One operator must be a friend and the other must not.
• B. One operator must be public and the other private.
• C. The operators must have a different parameter lists.
• D. It is not possible to have two different + operators.

Answer 1

Answer:-----------

1. Yes
2. A. 0
3. A. During the execution of Line 2.
4. D. After Line 5.
5. B. The operator is declared to be a friend to the class.
6. B. b
7. C. The assignment operator and the operator += have possible self-application
8. C. Linear time
9. B. The copy constructor.
10. ---------------
11. B. char s[9];
12. B. (x == y)
13. C. The operators must have a different parameter lists.