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 Hamming weight).

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

Credits:
Special thanks to @ts for adding this problem and creating all test cases.

int hammingWeight(uint32_t n) {    int num_bits = 0;    while(n != 0) {        if (n & 1) {            ++num_bits;        }        n = n >> 1;    }    return num_bits;}