From: Bob Stout 

On Wed, 2 Jun 2004, Bruce D. Wedding wrote:

> 3. Find if the given number is a power of 2.

This one's in SNIPPETS

----[ snip ]----
#include 
#include "snipmath.h"

int ispow2(int x)
{
      return! ((~(~0U>>1)|x)&x -1) ;
}

#ifdef TEST

int main(void)
{
      int i;

      for (i = 0; i < 256; ++i)
            printf("%3d: %d\n", i, ispow2(i));
      return 0;
}

#endif /* TEST */
----[ snip ]----

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