My favourite book on C is “The C programming language” by Kernighan and Ritchie. I had recommended it to someone else on this forum but he found it wasn't ideal as a beginners book so I am a little reluctant to push it again. But, it has a clarity of writing that I found refreshing when I was learning the language many years ago. See if you can find a copy in your local library.
And yes, I am in the UK, I live in north west London.
BTW, there is an article here you may find interesting: http://www.btinternet.com/~jon00/electmon.shtml