Converting number bases: fractions
	Given: decimal fraction representation
	Find: binary representation
	value:	0.375ten
			b-1	b-2	b-3	b-4	b-5
	weight		2-1	2-2	2-3	2-4	2-5
			0.5	0.25	0.125	0.0625	0.03125
	digit	0.
	To convert a whole number, we successively divided by 2
	What should we do with a fraction?
		0.375ten	= b-1 * 2-1 + b-2 * 2-2 + b-3 * 2-3 + b-4 * 2-4 + etc.