This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
A calculation usually involves numbers like 2 + 2 = 4. But in this case you don't really need to add, subtract or multiply. You may need to do some calculation for this assignment. It depends on your approach.
JavaBeginnersFaq "Yesterday is history, tomorrow is a mystery, and today is a gift; that's why they call it the present." Eleanor Roosevelt