How will you determine if a number is power of 2

Fri, Mar 5, 2010

unsigned int v; // we want to see if v is a power of 2
bool f; // the result goes here
f = (v & (v – 1)) == 0;
Note that 0 is incorrectly considered a power of 2 here. To remedy this, use:
f = !(v & (v – 1)) && v;

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How will you determine if a number is power of 2

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