How to dtermine if num is a power of 2

Hi All
How to determine if a given number n is a power of 2
thanks
bib

Assuming you are talking about integers.
public static boolean isPowerOfTwo(int i) {
if (i < 1) return false;
i = ((0xAAAAAAAA & i) >> 1) + (0x55555555 & i);
i = ((0xCCCCCCCC & i) >> 2) + (0x33333333 & i);
i = ((0xF0F0F0F0 & i) >> 4) + (0x0F0F0F0F & i);
i = ((0xFF00FF00 & i) >> 8) + (0x00FF00FF & i);
i = ((0xFFFF0000 & i) >> 16) + (0x0000FFFF & i);
return i == 1;
IMO, this seems a bit easier
int y = (int)(Math.pow((int)Math.sqrt(x),2));
if(y == x)

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How to dtermine if num is a power of 2

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