It is not bad. It could be better and go into more depth I feel. If you are curious, here are some things I found.

Rather damn good advice. And free like beer should be. http://c.learncodethehardway.org

C grammar pocket reference. Pure cheating. Actually has the sample code on how to use C. http://www.amazon.co.jp/dp/4774146102

Messing with C programs makes things easier. http://nostarch.com/debugging.htm

I hate it. Mainly because the layout and design gets to me. But I can't deny that it has good info. http://shop.oreilly.com/product/0636920015482.do

The next book to read after your intro to C. Actually explains how to write C programs after you know the grammar. http://www.amazon.co.jp/dp/4774146129

Says object oriented C. But actually it is about using scoping in C to organize your code. http://www.amazon.co.jp/dp/4798121134

Just about every way you can debug your C program. www.amazon.co.jpdp/4774133620

Starting Linux programming. Shows how to use system calls. And make a simple web server. http://www.amazon.co.jp/dp/4797328355

100 Examples of C programs. Brute force yourself into using learning C. http://www.amazon.co.jp/dp/4798017396

How to use various C libraries like BLAS and Cairo in C. http://www.amazon.co.jp/dp/4797361204

I know what you are saying, most of these are in Japanese. But the code is not. And rather easy to look at the code and see what they are doing. Anyhow, live dangerous I say. Not many books in English explain this stuff it seems. However, if anyone has nice C related info in any language, I would be appreciative.

"It's only in Japanese". You realize your language is crazy-hard? I wish you had no kanji, it would make my life easier. nihongo ga muzukashi desu...

I've been reading the early release. So far it's the best resource on C I've come across, although I am a C beginner. It's quite practical, focusing on basic tools at the start and then getting into syntax, code structure, and libraries.