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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.

class Solution {
public:
    int hammingWeight(uint32_t n) {
        int count=1,r=0;
        if(n<2) return n;
        while(n/2!=0){
            r=n%2;
            count+=r;
            n/=2;
            
        }
        return count;
        }
        
    
};

leetcode Number of 1 Bits

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原文地址：http://www.cnblogs.com/LUO77/p/4968212.html