i read all replies. because of i am new in C and my english is not enough to understand all, some explanatories are complicated for me. may be the other reason is the OS (so windows). i want to use linux but i think it is early for me now. of course i am waiting your advices about this issue. about my main issue, cleaning the screen, at least if i don't try to clean it it will be better for now :))
best regards umut
