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
overflow/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;
}

1. AReturns the int that has the binary representation of integer a.
2. BReturn the int that has the reversed binary representation of integer a.
3. CReturn the int that represents the number of 1's in the binary representation of integer a.
4. DReturn the int that represents the number of 0's in the binary representation of integer a.

Pick an option to check yourself, or open the answer below.

Show answer & explanation

Correct answer: B. Return the int that has the reversed binary representation of integer a.

Explanation

Each iteration shifts b left and appends a's lowest bit, then shifts a right: after 32 iterations b holds a's bits in reverse order.