# This program demonstrates what happens when you
# change the value of a parameter.

def main():
    value = 99
    print 'The value is', value
    change_me(value)
    print 'Back in main the value is', value

def change_me(arg):
    print 'I am changing the value.'
    arg = 0
    print 'Now the value is', arg

# Call the main  function.
main()