How to use malloc in C?

Dear JuneMouse,
Hi,
Your explanation was clear and it made everything manifest.
Just as the last question I want to know which book is the best for learning C programming in details.
Searchng in amazon I found a lot of books about C programming but I couldn't decide which one to buy.
Please recommend me a book which is worth buying and reading.
Thanks in advance.
Regards,
Zest.