I second the Programming in C by Kochan. I initially learned using the KNR but starting using this book after doing CS50 which is actually another great way to get introduced to C if you have the time to watch the lectures because they give you some training wheels that allow you to taste "doing things" with C before you know everything. There is something to be said for having that feeling of doing something cool once to motivate you to learn and get that feeling again.