gistfile1.txt

package main

//round n up to a multiple of a.  a must be a power of 2.
func round(n, a int) int {
	return (n + a - 1) &^ (a - 1)
}

func main() {
	println(round(3, 4))
	println(round(5, 4))
	println(round(13, 4))

}


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0110 => 6     1000 => 8    10000 => 16
0011 => 3     0011 => 3    00011 => 3
----------    ----------  -------
0100 => 4     1000 => 8   10000 =>16