Quiz Discussion

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]

  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

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

 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

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 of the following can be operands of arithmetic operators?

• 1]

  Numeric

• 2]

  Boolean

• 3]

  Characters

• 4]

  Both Numeric & Characters

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

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 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 program?

class Output 
{
        public static void main(String args[]) 
        {    
             int a,b,c,d;
             a=b=c=d=20
            a+=b-=c*=d/=20
           System.out.println(a+" "+b+" "+c+" "+d);
 
        } 
}

• 1]

  compile time error

• 2]

  runtime error

• 3]

  a=20 b=0 c=20 d=1

• 4]

  none of the mentioned