Integers: excess/bias
	One disadvantage of 2C:
		Can't sort values just using the bit representation.
		Would look like negative numbers were greater than positive numbers.
	Another idea:
		Consider the unsigned values for a 3-bit representation
			representation			value
			000			0
			001			1
			010			2
			011			3
			100			4
			101			5
			110			6
			111			7
		Represent negative values, but keep the values in representation order
		First half of the representations for negative, second half for positive
		This is called excess, or biased, representation.