Local Variables

• The Factorial function is defined outside of the main function.

• The main function declares one variable: "i".

• The Factorial function declares two variables: "product" and "i".

In general, when inside a function, you can only refer to the variables declared within it, its local variables. The formal parameters of a function are also local variables that may be used within that function.

What happens if we have two variables with the same name? -- You will always be using the local one.