.. ot-exercise:: python.exercises.herdt.while_even_numbers
   :dependencies: python.exercises.herdt.username_password,
		  python.basics.python_0193_while,
		  python.basics.python_0139_commandline_argv

.. include:: <mmlalias.txt>


Exercise: Even Numbers (``while``)
==================================

#. Write a program that outputs all even numbers from 0 (inclusive) up
   to a user-supplied upper bound (exclusive).

   Use a ``while`` loop!

.. code-block:: console

   $ python even.py 10
   2
   4
   6
   8

Dependencies
------------

.. ot-graph:: 
   :entries: python.exercises.herdt.while_even_numbers