OSDev.org

where can i get more free e-books about C?

do not expect us to provide illegal links offering e-books you should buy for free ... but if you're looking for C tutorials online, we'll try to offer what we found so far (personally, i own the Kernighan&Ritchie book on paper so i don't really need C tuts and therefore i have none)

there are plenty of tutorials for c-programming in the net. google is your friend.

try this one f. ex.:
[url=http://www.juicystudio.com/tutorials.html]Juicy studio tutorials[url]

But if i were you, i'd go to a book store and purchase a copy of c for dummies or the kerrigan&richie-book - they have created c, they are expected to know the goodies and the flaws of c. Given the time, I'll provide myself with that book too. The more you should get a book about basic algorithms - linked lists, sorting, binary trees and so forth. I have a stack of those books in my book shelf.