1. CSC 253
Lecture 7

2. Storage Classes Of the following storage class modifiers,
extern auto
register const
volatile static
which are in some sense “opposites”?
which of them are mutually exclusive?

3. static variables
Let’s write a program that demonstrates what a static variable does.
What are some uses of static variables?

4. Let’s try a program with externs
Declare int i in one file.
Declare int j in another file.
Declare one function in each of the two files.
What do we need to do to use all the variables and functions from a single main()?
What happens if we make them static?
Why?

5. Common errors Let’s write programs demonstrating these …
Same name, different type
this would occur if you used extern to declare a variable, but
then gave it a different type than its original declaration.
Multiple different definitions of the same function with external scope.

6. Variable # of arguments
Let’s write a sum function that takes a variable number of arguments.