... 10 3. Variables, Expressions, and Statements (Oh My) “It takes all kinds to make a world, does it not, ... types of things you can find in a program, so we can be clear what we're talking about. 3.1. Variables A variable is simply a name for a number. The number associated with that variable is ... variable named foo might have the value 2, the next you might change it to 3. It's variable, see? Variables can have different types, as well. In C, because it's such a picky language about...