decision constructs

Quiz Guidelines


Multiple Choice Question



public class TestClass{
public static int getSwitch(String str){
return (int) Math.round( Double.parseDouble(str.substring(1, str.length()-}
public static void main(String args []){
case 0 : System.out.print("Hello ");
case 1 : System.out.print("World"); break;
default : System.out.print(" Good Bye");
}   }

What will be printed by the above code if it is run with command line:      java TestClass --0.50
(There are two minuses before 0.)

Select 1 option

A. Hello
B. World
C. Hello World
D. Hello World Good Bye
E. Good Bye

Multiple Choice Question


Which of the changes given in options can be done (independent of each other) to let the following code compile and run without errors?

class SomeClass{
String s1 = "green mile"; // 0
public void generateReport( int n ){
String local; // 1
if( n > 0 ) local = "good"; //2
System.out.println( s1+" = " + local ); //3

Select 2 options

A. Insert after line 2 : else local = "bad";
B. Insert after line 2 : if(n <= 0) local = "bad";
C. Move line 1 and place it after line 0.
D. change line 1 to : final String local = "rocky";
E. The program already is without any errors.

Multiple Choice Question


Which of the following statements concerning the switch construct are true?

Select 3 options

A. A character literal can be used as a value for a case label.
B. A 'long' cannot be used as a switch variable.
C. An empty switch block is a valid construct.
D. A switch block must have a default label. 
E. If present, the default label must be the last of all the labels.

Multiple Choice Question


Assuming that a valid integer will be passed in the command line as first argument, which statements regarding the following code are correct?

public class TestClass{
   public static void main(String args[]){
      int x = Integer.parseInt(args[0]);
         case x &lt; 5 :   System.out.println("BIG"); break;
         case x &gt; 5 :   System.out.println("SMALL");
         default :    System.out.println("CORRECT"); break;

Select 1 option

A. BIG will never be followed by SMALL.
B. SMALL will never follow anything else.
C. SMALL will always be followed by CORRECT.
D. It will not compile.
E. It will throw an exception at runtime.

Multiple Choice Question


What will the following code print? 

int i = 0;
  int j = 1;
  if( (i++ == 0) &amp; (j++ == 2) ){
     i = 12;
  System.out.println(i+" "+j);

Select 1 option

A. 1 2 
B. 2 3
C. 12 2
D. 12 1
E. It will not compile.