Write a function that takes an unsigned integer and return the number of ‘1’ bits it has (also known as the Hamming weight).
Example 1:
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Input: 00000000000000000000000000001011 Output: 3 Explanation: The input binary string 00000000000000000000000000001011 has a total of three '1' bits.
Example 2:
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Input: 00000000000000000000000010000000 Output: 1 Explanation: The input binary string 00000000000000000000000010000000 has a total of one '1' bit.
Example 3:
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Input: 11111111111111111111111111111101 Output: 31 Explanation: The input binary string 11111111111111111111111111111101 has a total of thirty one '1' bits.
代码实现
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class { public: inthammingWeight(uint32_t n){ int result = 0; while (n > 0){ if (n & 1) { result ++; } n >>= 1; } return result; } };
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