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如何判断一个数是否是2的N次方

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Release： 2016-05-26 08:19:18
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判断一个数是否是2的N次方

#使用 $result = x&(x-1) 来判断；
if(x & (x-1))
{
   echo "不是2的n次方"
}
else
{
   echo "是2的n次方"
}
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如何判断一个数是否是2的N次方
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