Integers: 1's complement
	Another way to represent negative values:
		Negate (flip) each bit.
	Use the operator ~ to represent flipping each bit.
		~B is B with all of its bits flipped.
	This is called 1's complement (1C).
	Example: 11ten is 01011 in 5-bit unsigned binary.  Call this number B.
		B = 01011
		-B = 10100