Problem 5: Max Digit (100pts)

Write a function that takes in a non-negative integer and return its max digit. (Using floor division and modulo might be helpful here!)

def max_digit(x):
    """Return the max digit of x.

    >>> max_digit(10)
    1
    >>> max_digit(4224)
    4
    >>> max_digit(1234567890)
    9
    >>> # make sure that you are using return rather than print
    >>> a = max_digit(123)
    >>> a
    3
    """
    pass  # YOUR CODE HERE

Test your implementation with python ok -q max_digit.

Test your code for lab01 with python ok, and submit with python ok --submit.

If you want to submit manually, you can upload lab01.py to OJ website.