Test #1 Solution

1. (TCO 2) What is the value of data after the following code executes?

                unsigned char data = 0xA5;

                data = data & 0xF0;

 

                __ 0xA0    (bitwise and; 10100101 & 111100000 = 10100000)

                __ 0xF0

                __ 0xF5

                __ 0x5A

 

2. (TCO 2) What is wrong with the following switch statement?

 

                Switch(x)

                {

                case 0:

                     cout << 2/x;

                case 2:

                     cout << 2/x;

                     break;

                default:

                     cout << “error”;

                     break;

                }

 

                __ The value of x could be something other than 1 or 2. (false, others would default)

                __ There is no break statement for case 1.  (Malik pp. 217; must have break )

                __ There is no semicolon after the closing bracket. (not necessary)

                __ All of the above.

 

3. (TCO 2) Which operation in the following expression will be performed first?

     c = a++ / b + 5;

 

                __ a++   (Malik, pp. 1277 ++ then / then +)

                __ a/b

                __ assignment to c

                __ b + 5

 

4. (TCO 2) For a switch statement, which of the following case statements expressions is invalid or logically incorrect?

 

                __ case 1 < x < 100;

                __ case ‘B’|’b’;

                __ case a23.45

                __ All of the above (case labels cannot be expressions or alphanumeric)

 

5. (TCO 2) What is the value of i after the following code fragment executes?

     Int i = 2;

     Int k = 5;

     i *= k + 1;

 

                __ 7

                __ 11

                __ 12  ( the evaluation is the same as i = i * (k + 1) so i = 2 * (5 + 1) = 12)

                __ 14

 

6. (TCO 2) What is the data type of bullpen[3].era?

     Struct pitcher

     {

          String name;

          double era;

     };

     pitcher p1;

     pitcher bullpen[10];

 

                __ string

                __ double

                __ pitcher

                __ const pointer to pitcher

 

7. (TCO 2) Given the following code fragment, what is the data type of roster[9] .name?

     struct student

     {

          string name;

          double gpa;

     };

     student thisStudent;

     student roster[50];

 

                __ string

                __ const pointer to student

                __ student

                __ double

 

8. (TCO 2) What is the declaration for a C-style string that can hold a name with up to 3 printable characters (for example, “Ron”)?

 

                __ int name [3];

                __ char name [3];

                __ int name [4];

                __ char name [4];  

 

 

9. (TCO 2) Which of the following statements calls the following function correctly?

     Int MultiplyValues (int, int);

 

                __ int a = MultiplyValues (int x, int y);  

                __ int a = MultiplyValues (10, 20);

                __ double d = MultiplyValues (int 10, int 20);

                __ All of the above

 

10. (TCO 2) Which of the following is an invalid declaration to overload the following function?

       double foo(int);

 

                __ double foo(double);

                __ int foo(int);

                __ double foo(double *):

                __ double foo(int *);

 

11. (TCO 2) Which of the following functions is taking an array of MyStruct structures as a pass-by-value parameter?

 

                __ void MyFunc(MyStruct data[ ] );

                __ void MyFunc(MyStruct &data[ ] );

                __ void MyFunc(MyStruct *data [ ] );

                __ not allowed in C++

 

1. (TCO 2) Composition is typically an example of:

 

                __ a “has a” relationship  (Composition, Malik pp. 724)

                __ an “is a” relationship   (Inheritance, Malik pp. 724)

                __ a “uses a” relationship

                __ an “is used” relationship

 

2. (TCO 2) When organizing a program into three files (main, class implementation, and class header). Where are the user-defined data types declared?

 

                __ main.cpp

                __ class.cpp

                __ class.h ?

                __ main.h

 

3. (TCO 2) Which of the following is called automatically each time an object Is created?

 

                __ Compiler

                __ Builder

                __ Constructor

                __ Destructor

 

 

 

4. (TCO 2) Given the following class definition and lines of code, Line 1 in main is a call to what?

     class Distance

     {

     Private:

          int feet;

          double inches;

     public:

          Distance ( );

          Distance (int initFt, double initIn);

          void setFeet (int feetIn);

          void setInches (double inchesIn);

          int getFeet ( ) const;

          double getInches ( ) const:

    };

    int main ( )

    {

     Distance d1;                        //Line 1

     const int MAX = 100;         //Line 2

     Distance list [MAX];           //Line 3

     Distance d2 (1, 2.3);          //Line 4

     Distance * pDist;                //Line 5

     D1.feet = 5;                         //Line 6

                // ect. – assume that the remaining code is correct

     }

 

                __ The 0-argument Distance constructor.

                __ The 2-argument, int, double, Distance constructor.

                __ The 2-argument, double, int, Distance constructor.

                __ The 1-argument, int, Distance constructor.

 

5. (TCO 2) Variables defined to be of a user-declared class are referred to as:

 

                __ attributes

                __ member variables

                __ primitive variables

                __ objects

 

6. (TCO 2) What is the output of the following code snippet?

    

      int value = 10;

      int * iptr = &value;

      *iptr = 5;

      Cout << *iptr << “ “ << value;

 

                __ 5  5

                __ 10  10

                __ 5  10

                __ 10  5

 

7. (TCO 2) What is the output of the following code snippet?

 

     int *list = new int [5];

     int *ptr;

     for (int i = 0; i < 5; i++)

         list [ i ] = i + 1;

         ptr = list;

         delete [ ] list;

         cout << *ptr;

 

                __ 1

                __ address of list

                __ address of ptr

                __ error – ptr references memory which no longer belongs to the program

 

8. (TCO 2) Which of the following is not a legal value to initialize a pointer variable?

 

                __ zero

                __ null

                __ 0

                __ the address of a variable of the same type

 

9. (TCO 2) Which of the following Java statements creates an object of a ButtonHandler calss (which implements the ItemListener interface) and associates it with a JRadioButton object dalled buttonOne?

 

                __ buttonOne.addItemListener(ButtonHandler( ) );

                __ buttonOne.addItemListener(new ButtonHandler( ));

                __ buttonOne.+= new ButtonHandler( );

                __ buttonOne.addEventHandlerr(new ButtonHandler( ));

 

10. (TCO 2) What Java package contains the definitions of the Java event listener interfaces?

 

                __ java.events

                __ java.GUI.events

                __ java.awt.event

                __ java.event.listener

 

11. (TCO 2) Which of the following creates a multiline display which is user editable?

 

                __ JLabel display = new JLabel(“Enter text”);

                __ JTextField display = new JTextField(“Enter text”);

                __ JTextArea display = new JTextArea(20, 20);

                __ JScrollPane display = new JScrollPane( );

 

12. (TCO 2) In the event of an error in a Java program, what class and method would you use to display a message box indicating that an error had occurred?

 

                __ Use the showMessageBox method of the System.out class.

                __ Use the showInputDialog method of the JOptionPane class.

                __ Use the show Error Message method of the JDialog class.

                __ Use the showMessageDialog method of the JOptionPane class.

 

13. (TCO 2) The x, y drawing coordinate system used in Java graphics

 

                __ uses character units.

                __ has the origin in the upper left corner of the display area.

                __ uses the x coordinate for the verticle axis.

                __ All of the above

 

14. (TCO 2) Which of the following Java statements gets an integer value from the user?

       Public class MyApp extends JFrame implements ActionListener {….}

 

                __ int x = Integer.parseInt(JOptionPane.showInputDialog(“Enter an integer value”));

                __ int x = JOptionPane.getInteger(“Enter an integer value”);

                __ int x = Scanner.getInt(“Enter an integer value”);

                __ int x = String.toInt(JOptionPane.showMessageDialog(“Enter an integer value”));