LintCode-181.将整数A转换为B

class Solution {
    /**
     *@param a, b: Two integer
     *return: An integer
     */
    public static int bitSwapRequired(int a, int b) {
        // write your code here
        int c = a^b;
        int sum = 0;
        while(c!=0){
            c = c&(c-1);
            sum++;
        }
        return sum;
    }
};