function power2(x)
{
	var x1 = 2;
	for(var j=1;j<x;j=j+1)
	{
		x1=x1*2;
	}
	return(x1);
}

function root2(x)
{
	for(var j=0;x>1;j=j+1)
	{
		x=x/2;
	}
	return(j);
}

function log2(x)
{
	var NATLOG_TO_LOG2 = 1.4426950408889634;
	var result = NATLOG_TO_LOG2 * Math.log(x);
	return result;
}
function log10ToLog2(x)
{
	var LOG10_TO_LOG2 = 3.3219280948873626;
	var result = LOG10_TO_LOG2 * Math.log(x);
	return result;
}