This chapter involves math related to whole numbers that you learned in grade school: the processes of addition and subtraction. There you learned about the number line in which numbers just go on forever in positive and negative directions. In computers, as the numbers increase in a positive or negative amount they actually approach a limit (the end of their finite space). Upon reaching the end of the world (Flat Earth Society), they overflow and wrap to the opposite end of the number line (quantum physics, or was that string theory?). Well, anyway, your integer range of numbers is limited by the size of the data used to store them.