【leetcode】191. Number of 1 Bits（easy）

判断32位无符号整数二进制形式有多少个1.

// 191.Number of 1 Bits
int solution::hammingWeight(unsigned int n)
{
	int a = 1;
	int count = 0;
	for (int i = 1; i <= 32; ++i)
	{
		if ((a & n) == 1)
		{
			++count;
		}
		
		n = n >> 1;
	}
	return count;
}