#476 Number Complement

题目：

Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation.

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代码：

/**

* @param {number} num

* @return {number}

*/

var findComplement = function(num) {

var n = 1;

while (n <= num) {

n *= 2

}

return ((n - 1) ^ num);

};