swcarpentry/bc — pull request #896 by chinchliff (2014-11-24 22:07:49+00:00)
Title: Some minor edits to the loops lesson

I added a challenge problem that introduces while loops--these don't seem to be critical to the lesson material but they are an important element of programming and it seems useful to at least mention them here. I also reworded some of the explanation/discussion of mutable vs. immutable variables, in an effort to improve clarity. Finally, I made a couple of other (very minor) changes to some examples.