# Author:  James Tam
# Version: March 6, 2010

# Learning concepts: pass by reference (passing a reference to a
# list).

# In function fun another local reference refers to the original list in main.
# Since this copy refers to the original list changes made via the local reference
# will change the original list.
def fun(list):
    list[0] = 99
    print(list)

def main():
    list = [1,2,3]
    print(list)
    fun(list)
    print(list)

main()