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Discussion :: Operators and Assignments

  1. What will be the output of the program?

    public class Test 
{    
    public static void leftshift(int,int j)    
    {
        i=j;
    } 
    public static void main(String args[])      
    {       
       int i = 4, j = 2;           
       leftshift(i, j);           
       System.out.println(i); 
    }  
 }

    2. A.

    2
    B.

    4
    C.

    8
    D.

    16

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    Workspace

    View Answer

    Answer : Option B

    Explanation :

    Java only ever passes arguments to a method by value (i.e. a copy of the variable) and never by reference. Therefore the value of the variable i remains unchanged in the main method.

    If you are clever you will spot that 16 is 4 multiplied by 2 twice, (4 * 2 * 2) = 16. If you had 16 left shifted by three bits then 16 * 2 * 2 * 2 = 128. If you had 128 right shifted by 2 bits then 128 / 2 / 2 = 32. Keeping these points in mind, you don't have to go converting to binary to do the left and right bit shift

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