count set bits in an integer c 2b 2b

1//Method 1
2	int count = __builtin_popcount(number);
3//Method 2
4	int count = 0;
5    while (number) {
6        count += number & 1;
7        n >>= 1;
8    }

1countBits = (n) => n.toString(2).split("0").join("").length;

1//Method 1
2   int count = 0;
3   while (n)
4   {
5        count++;
6        n >>= 1;
7    }
8//Method 2
9	int count = (int)log2(number)+1;