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@Norm : thanks, I am trying to add the System.out.println to each section to see what is going on.

Edit: I think I figure out the error. Thanks again Norm, your trick works.:cool:

This is what I got from running those codes:

Please help me, I got stuck on this one from yesterday til now. Long story short : I have to build an java apps for doing polynomial : addition, subtraction, derivative .... The data structure chosen...