UGC NET CSE | December 2018 | Part 2 | Question: 49

Question

What does the following Java function perform? (Assume int occupies four bytes of storage)

public static int f(int a)
{   // Pre-conditions : a > 0 and no oveflow/underflow occurs
    int b=0;
    for (int i=0; i<32; i++)
    {
        b = b<<1;
        b=b | ( a & 1);
        a=a >>>1; // This is a logical shift
    }
    return b;
}

• A. Returns the int that has the binary representation of integer a
• B. Return the int that has reversed binary representation of integer a
• C. Return the int that represents the number of $1$’s in the binary representation of integer a
• D. Return the int that represents the number of $0$’s in the binary representation of integer a

Comments

option B.

Note that <<< is logical shift Right ===> sign extension doesn't takes place

Answer 1

C is the correct Answer

Comments

explain??