Bitshift operators
	x << n	Shift bits of x left by n digits
		Insert 0's on the right
	x >> n	Shift bits of x right by n digits
		If unsigned or non-negative, insert 0's on left
		If signed, may be system dependent
	Important: x DOES NOT CHANGE!
		(just like x + 2 does not change x)
		x <<= n		change x
		x >>= n
	x and n must be int