# Author:  James Tam
# Version: Oct 2013

def fun (num): # Copy the value of 12 into a local variable
    print(num)  
    num = num + num # Only local copy changed
    print(num)  
    return(num)  # Pass changes back to caller of function

def start():
    num = 12
    print(num)  # OK within scope
    num = fun(num)  # Changes saved
    print(num) 

start()