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Trying to understand Puzzle4..Head First

 
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Hi!! I'm trying to understand the sharpen your pencil Class Puzzle4 from head first java.. But the math and the logic is confusing me... I hope someone can give me some explanation before I move on in the book... The output of the code should be Result 543345





ivar is an instance and the value of it is unique to every object is that right?? The logic of the method is confusing me. I understand that x is the argument to

 
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