multiple choice questions

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Page 1

Question 1. 1. (TCO 2) What is the value ofdata after the following code executes?
unsigned char data = 0xA5;
data = data & 0xF0; (Points : 6)

      0xA0
     0xF0
      0xF5
      0x5A

Question 2. 2. (TCO 2) If firstName and lastName are string object variables, which statement can be used to combine (append or concatenate) the two into a single string variable? (Points : 6)

      fullName = firstName + lastName;
      fullName = firstName, lastName;
      fullName = firstName&lastName;
      fullName = firstName&&lastName;

Question 3. 3. (TCO 2) For a switch statement, which of the following case statement expressions is invalid or logically incorrect? (Points : 6)

      case 1 < x < 100;
      case 'B'|'b';
      case a23.45
      All of the above

Question 4. 4. (TCO 2) What output does the following code produce?
                                    cout<< fixed <<setprecision(3);
                                    double pi = 3.14159;
                                    cout<< pi <<endl; (Points : 6)

      3.14159
      3.142
      3.14
      none of the above

Question 5. 5. (TCO 2) What is the value of i after the following code fragment executes?
inti = 2;
int k = 5 ;
i *= k + 1; (Points : 6)

      7
      11
      12
      14

Question 6. 6. (TCO 2) What is the data type of bullpen[3].era?
            struct pitcher
{
     string name;
     double era;
};
pitcher p1;
pitcher bullpen[10]; (Points : 6)

      string
      double
      pitcher
      const pointer to pitcher

Question 7. 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]; (Points : 6)

      string
      const pointer to student
      student
      double

Question 8. 8. (TCO 2) Given the following code fragment, what is the data type of thisStudent?

struct student
{
string name;
double gpa;
};
student thisStudent; (Points : 6)

      string
      const pointer to student
      student
      double

Question 9. 9. (TCO 2) Which of the following statements calls the following function correctly?
intMultiplyValues (int, int); (Points : 6)

int a = MultiplyValues (int x, int y);
      int a = MultiplyValues (10, 20);
      double d = MultiplyValues (int 10, int 20);
      All of the above

Question 10. 10. (TCO 2) What is the output of the following code?

voidfunc(int x[ ])
{
            x[0] = x[0] * 3;
            x[1] = x[1] * 3;
            x[2] = x[2] * 3;
}

int main ()
{
            int x[ ] = {1, 2, 3};
            func(x);
            cout<< x[0] << " " << x[1] << " " << x[2] <<endl;
} (Points : 6)

      1 2 3
      3 4 5
      3 6 9
      3 33

Question 11. 11. (TCO 2) Which of the following function definitions uses pass-by-values? (Points : 6)

      intmyFunc( int * x, int * y );
      intmyFunc( int x, int y ) ;
      intmyFunc( int& x, int& y ) ;
      intmyFunc( int @value1, int @value2 ) ;

Page 2

Question 1. 1. (TCO 2) How many parameters are required to overload the pre-increment operator for a class as a member function? (Points : 6)

      none
      1
      2
      no limit

Question 2. 2. (TCO 2) What is the name of a member function of a class that only accesses the value(s) of member variable(s) and does not modify the value(s)? (Points : 6)

      Set
      Private
      Member
      Accessor

Question 3. 3. (TCO 2) Which of the following is a valid declaration to overload the following function?
int whatever (double x); (Points : 6)

      double whatever (double x);
      int whatever (int x);
      int whatever2 (double x);
      int overload (double x);

Question 4. 4. (TCO 2) Variables defined to be of a user-declared class are referred to as: (Points : 6)

      attributes
      member variables
      primitive variables
      objects

Question 5. 5. (TCO 2) When organizing a program into three files (main, class implementation, and class header), which is not a .cpp file? (Points : 6)

      main
      none are .cpp
      class header
      class implementation

Question 6. 6. (TCO 2) What is the data type of pDist for the code snippet below?
Distance * pDIST; (Points : 6)

      Distance
      Const pointer to Distance
      Pointer to Distance
      None of the above

Question 7. 7. (TCO 2) What is the output of the following code snippet?
                  int value = 10;
                  int * iptr = &value;
                  *iptr = 5;
                  Cout<< *iptr<< “ “ << value; (Points : 6)

      5 5
      10 10
      5 10
      10 5

Question 8. 8. (TCO 2) What is wrong with the following C++ statements?
int * iptr;
double d = 123.321;
iptr = &d;
cout<< *iptr; (Points : 6)

      The cout statement does not contain an endl.
      The space following the ampersand should not be there.
      The iptr variable cannot be given an address of a double.
      All of the above

Question 9. 9. (TCO 2) What does the following Java code do?
JPanel pane = new JPanel( );
pane.setLayout( new gridLayout(2, 3) ); (Points : 6)

      Creates a panel which will organize its components into 5 distinct cells.
      Creates a panel which displays a grid containing the numbers 2 and 3.
      Creates a panel which will organize its components into two rows of three columns.
      None of the above.

Question 10. 10. (TCO 2) Which of the following is an example of the invocation of a static method in Java? (Points : 6)

      Integer.parseInt(someString);
      Math.pow(2, 3);
      String.format(“This is an output string”);
      All of the above

Question 11. 11. (TCO 2) Which Java interface would you need to implement in order to handle events such as key pressed or key released events? (Points : 6)

      KeyListener interface
      KeyStroke interface
      KeyEvent interface
      This information is not available in a Java program

Question 12. 12. (TCO 2) What can you say about the following Java class?
Public class MyApp extends JFrame( …) (Points : 6)

      MyApp is a Java application.
      MyApp implements the JFrame interface.
      MyApp inherits from the JFrame class.
      MyApp has a nested inner class called JFrame.

Question 13. 13. (TCO 2) The Graphics class in Java provides methods to: (Points : 6)

      draw lines between any two points
      draw test strings starting at any point
      draw shapes such as rectangles, ovals, etc.
      All of the above

Question 14. 14. (TCO 2) The x, y drawing coordinate system used in Java graphics (Points : 6)

      uses character units.
      has the origin in the upper left corner of the display area.
      uses the x coordinate for the vertical axis.
      All of the above

Page 1

Question 1. 1. (TCO 2) Which of the following is not a C++ logical operator? (Points : 6)

      #
      &&
      „„
      !

Question 2. 2. (TCO 2) What is wrong with the following switch statement?
switch(x)
{
case 0:
    cout<< x;
case 2:
    cout<< 2 / x;
    break;
default:
    cout<< “error”;
    break;
} (Points : 6)

      The value of x could be something other than 1 or 2.
      There is no break statement for case 1.
      There is no semicolon after the closing bracket.
      All of the above

Question 3. 3. (TCO 2) Why does this code snippet give a compile error?
int   loopCounter = 0;
       numberOfScores = 20;
while (loopcounter<numberOfScores)
            cout<< “\nInside the loop”; (Points : 6)

      The value of the control loop control variable does not change the loop body.
      The curly brackets are missing around the loop body.
      The loopCounter variable is not spelled consistently.
      All of the above

Question 4. 4. (TCO 2) Which operation in the following expression will be performed first?
c = a++ / b + 5; (Points : 6)

      a++.
      a/b
      assignment to c
      b + 5

Question 5. 5. (TCO 2) Which looping statement is best if the number of iterations is known? (Points : 6)

      if/else
      for
      while
      do/while

Question 6. 6. (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]; (Points : 6)

      string
      const pointer to student
      student
      double

Question 7. 7. (TCO 2) Which type of error does the following code fragment cause?
constint MAX = 500;
int main (void)
{
            int foo [MAX];
            for (inti = 0; i<= MAX; i++)
            {
                        foo [i] = i * 2;
            } (Points : 6)

      Compiler, due to out-of-bounds array subscript.
      Run-time, due to out-of-bounds array subscript.
      Compiler, due to invalid array initialization.
      None of the above. It does not create any type of error.

Question 8. 8. (TCO 2) How many elements does the following array contain?
double data [100] [500]; (Points : 6)

      500
      100
      600
      50,000

Question 9. 9. (TCO 2) Which of the following functions is taking an array of MyStruct structures as a pass-by-value parameter? (Points : 6)

      voidMyFunc( MyStruct data[ ] );
      void MyFunc( MyStruct&data[ ] );
      void MyFunc( MyStruct *data[ ] ) ;
      not allowed in C++

Question 10. 10. (TCO 2) What is the output of the following code?
                        voidfunc(int x)
                        {
                                    x = x * 2;
                        }
int main( )
{
        int x = 10;
        func(x);
        cout<< x <<endl;
} (Points : 6)

      20
      30
      10
      5

Question 11. 11. (TCO 2) What is the output of the following code?
                        voidfunc(int *x)
                        {
                                    *x = *x * 3;
                        };
                        int main()
                        {
                                    int x = 10;
                                    func (&x) ;
                                    cout<< x <<endl ;
                        } (Points : 6)

      20
      30
      10
      5

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Page 2

Question 1. 1. (TCO 2) Which of the following is a valid declaration to overload the following function?
int whatever (double x); (Points : 6)

      double whatever (double x);
      int whatever (int x);
      int whatever2 (double x);
      int overload (double x);

Question 2. 2. (TCO 2) The word const inside the parentheses of the following declaration of isEqualboolisEqual (const Distance &rightSideObject) const; (Points : 6)

      ensures the member variables of the called objects are protected (cannot be changed)
      ensures the argument passed in to the function is protected (cannot be changed)
      ensures the return value of the function is protected (cannot be changed)
      ensures the return value is routed to the proper variable

Question 3. 3. (TCO 2) How many parameters are required to overload the pre-increment operator for a class as a member function? (Points : 6)

      none
      1
      2
      no limit

Question 4. 4. (TCO 2) Which of the following is called automatically each time an object is created? (Points : 6)

      Compiler
      Builder
      Constructor
      Destructor

Question 5. 5. (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(intinitFt, double initIn);
    void setFeet(intfeetIn);
    void setInches(double inchesIn);
    intgetFeet() const;
    double getInches( ) const;
};
int main( )
{
Distance d1;              //Line 1
constint 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
// etc. – assume the remaining code is correct
} (Points : 6)

      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

Question 6. 6. (TCO 2) What is the data type of pDist for the code snippet below?
Distance * pDIST; (Points : 6)

      Distance
      Const pointer to Distance
      Pointer to Distance
      None of the above

Question 7. 7. (TCO 2) Given the definition of some class called Employee, which of the following correctly dynamically allocates an array of 20 Employee objects? (Points : 6)

      Employee * myData = new Employee[20];
      Employee myData[20] = new Employee[20];
      Employee = myData[20];
      Employee array = new Employee[20];

Question 8. 8. (TCO 2) What is the output of the following code snippet?
                  int value = 10;
                  int * iptr = &value;
                  *iptr = 5;
                  Cout<< *iptr<< “ “ << value; (Points : 6)

      5 5
      10 10
      5 10
      10 5

Question 9. 9. (TCO 2) Which of the following Java statements creates an object of a ButtonHandler class (which implements the ItemListener interface) and associates it with a JRadioButton object called buttonOne? (Points : 6)

      buttonOne.addItemListener(ButtonHandler( ));
      buttonOne.addItemListener(new ButtonHandler());
      buttonOne.+= new ButtonHandler( );
      buttonOne.addEventHandlerr(new ButtonHandler( ));

Question 10. 10. (TCO 2) Which of the following creates a class that properly handles ActionEvents? (Points : 6)

      class handler implements ActionListener
     {public void actionPerformed(ActionEvent e){//code for event handler} }
      class handler extends ActionListener
     {public void handleEvent(ActionEvent e){//code for event handler} }
      class handler implements ActionListener
     {public void ActionListener(ButtonEvent e){//code for event handler} }
      class handler implements ActionListener
     {public void actionPerformed(ActionListener e){//code for event handler} }

Question 11. 11. (TCO 2) The x, y drawing coordinate system used in Java graphics (Points : 6)

      uses character units.
      has the origin in the upper left corner of the display area.
      uses the x coordinate for the vertical axis.
      All of the above

Question 12. 12. (TCO 2) In order to guarantee that only one JRadioButton is selected at any time: (Points : 6)

      add each JRadioButton object to a different panel
      create a ButtonGroup object and add the JRadioBttons to it
      have a JCheckBox object manage the three JRadioButtons
      This cannot be done in Java.

Question 13. 13. (TCO 2) What can you say about the following Java class?
Public class MyApp extends JFrame( …) (Points : 6)

      MyApp is a Java application.
      MyApp implements the JFrame interface.
      MyApp inherits from the JFrame class.
      MyApp has a nested inner class called JFrame.

Question 14. 14. (TCO 2) What is the result of the following code?
     JFrame frame = new JFrame( );
            frame.add(new JButton(“One”), BorderLayout.NORTH);
            frame.add(new JButton(“Two”), BorderLayout.NORTH);
            frame.setVisible(true); (Points : 6)

      Two buttons are added side by side at the top of the display.
      Button One was added first, so it is the only button at the top of the display.
      Button Two was added last, so it is the only button at the top of the display.
      The Java compiler will not allow you to add two buttons to the same area.

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multiple choice questions

What is the value of data after the following code executes?