Quiz Discussion

Which right shift operator preserves the sign of the value?

• 1]

  <<

• 2]

  >>

• 3]

  <<=

• 4]

  >>=

What is the order of precedence (highest to lowest) of following operators?

    1. &    
    2. ^
    3. ?:

• 1]

  1 -> 2 -> 3

• 2]

  2 -> 1 -> 3

• 3]

  3 -> 2 -> 1

• 4]

  2 -> 3 -> 1

Which of these statements are incorrect?

• 1]

  Assignment operators are more efficiently implemented by Java run-time system than their equivalent long forms

• 2]

  Assignment operators run faster than their equivalent long forms

• 3]

  Assignment operators can be used only with numeric and character data type

• 4]

  None of the mentioned

What will be the output of the following Java program?

    class leftshift_operator 
    {
        public static void main(String args[]) 
        {        
             byte x = 64;
             int i;
             byte y; 
             i = x << 2;
             y = (byte) (x << 2)
             System.out.print(i + " " + y);
        } 
    }

• 1]

  0 64

• 2]

  64 0

• 3]

  0 256

• 4]

  256 0

Decrement operator, −−, decreases the value of variable by what number?

• 1]

  1

• 2]

  2

• 3]

  3

• 4]

  4

Which of the following operators can operate on a boolean variable?

   1. &&
   2. ==
   3. ?:
   4. +=

• 1]

  3 & 2

• 2]

   1 & 4

• 3]

   1, 2 & 4

• 4]

  1, 2 & 3

Which operator is used to invert all the digits in a binary representation of a number?

• 1]

  ~

• 2]

  <<<

• 3]

  >>>

• 4]

  ^

 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

Which of these lines of Java code will give better performance?

   1. a | 4 + c >> b & 7; 
   2. (a | ((( 4 * c ) >> b ) & 7 ))

• 1]

  1 will give better performance as it has no parentheses

• 2]

  2 will give better performance as it has parentheses

• 3]

  Both 1 & 2 will give equal performance

• 4]

  Dependent on the computer system

What will be the output of the following Java program?

    class Modulus 
    {
        public static void main(String args[]) 
        {    
             double a = 25.64;
             int  b = 25;
             a = a % 10;
             b = b % 10;
             System.out.println(a + " "  + b);
        } 
    }

• 1]

  5.640000000000001 5

• 2]

  5.640000000000001 5.0

• 3]

  5 5

• 4]

  5 5.640000000000001