def make_greeting(name):
    '''Return a string greeting
    the specified name.'''
    return 'Hi there, ' + name + '!'


def triple_function(num):
    '''Return num times 3'''
    return num * 3


def triple_procedure(num):
    '''Print the value of num times 3.
    This procedure does not return anything!
    That is to say, it implicitly returns the special value None'''
    print(num * 3)
    

def triple_wrong(num):
    '''This function is wrong! It is returning the result
    of a procedure (print), which returns None. This, this
    function always returns None (just as in the true procedure above.'''
    return print(num * 3)


def ask_age():
    '''Ask the user for their age in years,
    then print their age in days.'''
    age_years = input('Enter your age: ')
    age_days = int(age_years) * 365
    print('You are ' + str(age_days) + ' days old!')
    print('You are', age_days, 'days old!')