3/31/16 slide 19 and 20

slide 19 global

any line of code below a declared variable , within the same curly braces, can modify that variable.

Global variables are bad. All functions can modify it. A Global variable sits outside of all functions.
Global Variables are bad.

Local variables are best. Local variables exist within and only within the functions they are declared in.

There are static variables - variables that are not destroyed after the function ends.

slide 20

Static variables are always initialized to 0 by default, unless otherwise initialized.
Only initialized once.
Whatever its value at the end of function, is its value when the function is called again.
STATIC VARIABLE LIVES OUTSIDE OF FUNCTION BUT CAN ONLY BE ACCESSED FROM WITHIN FUNCTION.