Can any 1 help me in learning c logics?

Actually I hv read all the topics and know every concept in c ie i know the types of loops and its uses.But the problem is that I dont understand what to write in the coding like the factorial,fibonacci.while,do while & for loop.Plz is there any way to develop a good logic.Plz dont tell me to read the books like kanetkar,bal guruswamy as I hv already read it.plz help me out.