问题描述:
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.
思路:
1、十进制变为二进制,经典解法;
2、求余除2依次得到2进制存入数组中;
3、统计数组中1的个数。
代码:
class Solution {
public:
int hammingWeight(uint32_t n) {
if(n == 0)
{
return 0;
}
int array[32] = {0};
int i = 0;
while(n)
{
array[i++] = n % 2;
n = n / 2;
}
int count = 0;
for(int j = 0; j < 32; ++j)
{
if(array[j] == 1)
{
++count;
}
}
return count;
}
};