Number of 1 Bits

Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the ).

For example, the 32-bit integer ’11' has binary representation 00000000000000000000000000001011, so the function should return 3.

int hammingWeight(uint32_t n) {
    if(n==0)
        return 0;
    return (n&0x01==0x01)? hammingWeight(n>>1)+1:hammingWeight(n>>1);
}