Quiz Discussion

What will be the output of the following Java code?

class Output 
{
        public static void main(String args[]) 
        {    
             int x=y=z=20;
 
        } 
}

• 1]

  compile and runs fine

• 2]

  20

• 3]

  run time error

• 4]

  compile time error

 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 statements are incorrect?

• 1]

  Equal to operator has least precedence

• 2]

  Brackets () have highest precedence

• 3]

  Division operator, /, has higher precedence than multiplication operato

• 4]

  Addition operator, +, and subtraction operator have equal precedence

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

Which right shift operator preserves the sign of the value?

• 1]

  <<

• 2]

  >>

• 3]

  <<=

• 4]

  >>=

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 is the output of relational operators?

• 1]

  Integer

• 2]

  Boolean

• 3]

  Characters

• 4]

  Double

What will be the output of the following Java program?

    class increment 
    {
        public static void main(String args[])
        {
            double var1 = 1 + 5; 
            double var2 = var1 / 4;
            int var3 = 1 + 5;
            int var4 = var3 / 4;
            System.out.print(var2 + " " + var4);
 
        } 
    }

• 1]

  1 1

• 2]

  0 1

• 3]

  1.5 1

• 4]

  1.5 1.0

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

What will be the output of the following Java program?

    class bitwise_operator 
    {
        public static void main(String args[]) 
        {    
             int a = 3;
             int b = 6;
 	         int c = a | b;
             int d = a & b;             
             System.out.println(c + " "  + d);
        } 
    }

• 1]

  7 2

• 2]

  7 7

• 3]

  7 5

• 4]

  5 2