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

def main():
    value = 99
    print(f'The value is {value}.')
    change_me(value)
    print(f'Back in main the value is {value}.')

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

# Call the main  function.
main()
