Bitwise operators
	Logical operators
		&&, ||	and, or
		operate on entire value
			int x = 0, y = 1;
			(x && y)		value 0
			(x || y)		value 1
	May want to work with individual bits
		int x = 2, y = 7;
		(x && y)		value 1
		What about bits?									value
		x	0000	0000	0000	0000	0000	0000	0000	0010	2
		y	0000	0000	0000	0000	0000	0000	0000	0111	7
		Bitwise and
		x & y	0000	0000	0000	0000	0000	0000	0000	0010	2
		Bitwise or
		x | y	0000	0000	0000	0000	0000	0000	0000	0111	7
		Bitwise xor (exclusive-or)
		x ^ y	0000	0000	0000	0000	0000	0000	0000	0101	5
		Value of a bit is 1 if only one bit is 1
		Complement
		~x	1111	1111	1111	1111	1111	1111	1111	1101
		~y	1111	1111	1111	1111	1111	1111	1111	1000
		Each bit is "flipped" to opposite value
		How is this related to negative value?