1. Nate Brunelle Today: Functions again, Scope
CS1110
Nate Brunelle
Today: Functions again, Scope

2. Questions?

3. Last Time
Functions

4. Visualizing Programs

5. Scope Scope- The area where a variable has meaning
Usually: variable is in scope when it is created onward.
Functions: variable is in scope only in the function in which it is defined

6. What happens when you invoke a function?
Create memory for the function
Copy argument values into parameter names
Do what the function says
Know what to return
Remove the memory for the function

7. Which variable v is in scope?
If the variable v is available in the local scope, use that one
If the variable v is not available in the local scope, use the variable v available in the global scope
If a function ever will have the local variable v, you can only use that variable v

8. Global variables
Allow you to have something “remembered” from one run of a function to another.