Low-level operations in C
	C was invented as a high-level systems programming language
		Higher than assember, but still close to the machine
	Binary data representation
		int type: two's complement
		float type: IEEE 754
		hexadecimal: another representation for binary
	Hexadecimal constant:
		int i = 0x1234abcd;
		Can use upper or lower case for digits
	Read or print hex values:
		scanf ("%x", &i);
		printf ("%x", i);
	Manipulating individual bits:
		bitwise logical operators
		bitshift operators