def ceil_div(num, div):
    """
    Returns the ceiling function of a division between `num` and `div`.

    Usage::

        >>> ceil_div(100, 7)
        15
        >>> ceil_div(100, 10)
        10
        >>> ceil_div(1, 4)
        1

    :param num: Division's numerator, a number
    :param div: Division's divisor, a number

    :return: Rounded up result of the division between the parameters.
    """
    quanta, mod = divmod(num, div)
    if mod:
        quanta += 1
    return quanta
