Number of 1 Bits

Write a function that takes an unsigned integer and returns the number of 1 bits it has.

Example:

The 32-bit integer 11 has binary representation

00000000000000000000000000001011

so the function should return 3.

Note that since Java does not have unsigned int, use long for Java

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.