Quiz Discussion

What will be the output of the following Java program?

    class rightshift_operator 
    {
        public static void main(String args[]) 
        {    
             int x; 
             x = 10;
             x = x >> 1;
             System.out.println(x);
        } 
    }

• 1]

  10

• 2]

  5

• 3]

  2

• 4]

  20

What will be the output of the following Java code?

    class bool_operator 
    {
        public static void main(String args[]) 
        {    
             boolean a = true;
             boolean b = !true;
             boolean c = a | b;
 	     boolean d = a & b;
             boolean e = d ? b : c;
             System.out.println(d + " " + e);
        } 
    }

• 1]

  false false

• 2]

  true ture

• 3]

  true false

• 4]

  false true

Which of these is returned by “greater than”, “less than” and “equal to” operators?

• 1]

  Integers

• 2]

  Floating – point numbers

• 3]

  Boolean

• 4]

  None of the mentioned

What should be expression1 evaluate to in using ternary operator as in this line?

 expression1 ?  expression2  :  expression3

• 1]

  Integer

• 2]

  Floating – point numbers

• 3]

  Boolean

• 4]

  None of the mentioned

 What is the value stored in x in the following lines of Java code?

   int x, y, z;
    x = 0;
    y = 1;
    x = y = z = 8;

• 1]

  0

• 2]

  1

• 3]

  9

• 4]

  8

Which of these have highest precedence?

• 1]

  ()

• 2]

  ++

• 3]

  *

• 4]

  >>

What will be the output of the following Java code?

    class ternary_operator 
    {
        public static void main(String args[]) 
        {        
             int x = 3;
             int y = ~ x;
             int z;
             z = x > y ? x : y;
             System.out.print(z);
        } 
    }

• 1]

  0

• 2]

  1

• 3]

  3

• 4]

  -4

Which of these statements are incorrect?

• 1]

  The left shift operator, <<, shifts all of the bits in a value to the left specified number of times

• 2]

  The right shift operator, >>, shifts all of the bits in a value to the right specified number of time

• 3]

  The left shift operator can be used as an alternative to multiplying by 2

• 4]

  The right shift operator automatically fills the higher order bits with 0

 On applying Left shift operator, <<, on integer bits are lost one they are shifted past which position bit?

• 1]

  1

• 2]

  32

• 3]

  33

• 4]

  31

With x = 0, which of the following are legal lines of Java code for changing the value of x to 1?

   1. x++;
   2. x = x + 1;
   3. x += 1;
   4. x =+ 1;

• 1]

  1, 2 & 3

• 2]

  1 & 4

• 3]

  1, 2, 3 & 4

• 4]

  3 & 2