Given an integer, write a function to determine if it is a power of two.
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Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.
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1 class Solution { 2 public: 3 bool isPowerOfTwo(int n) { 4 5 return (n>0)&&((n&(n-1))==0); 6 } 7 };
原文：http://www.cnblogs.com/fengyehe/p/5292829.html