ITEC 120 2007spring ibarland, jpittges

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lect07c
review
lect07c

We'll be reviewing the class material so far!

Some motivating questions:

• (Program design, and Functions calling functions:)
  Recall: The ebay-fee question, where an auction fee consists of three parts: the listing fee (flat), the gallery-usage fee , and the final-value-fee (a commission, with tiered rates). We had eBay experts able to answer what the overall fee was.
  Desired: But for billing purposes etc., it's also often useful to ask what any of the three sub-fees comes too. (Certainly, an itemized bill needs to know that.) So our method, as it stands, is a bit limited.
  Task How to modify an EbayExpert, so that it can also answer these smaller questions? Rewrite the overall computeEbayFee, in light of your new smaller methods.
• (Fields vs. local variables) What's good & bad about the following code, for PizzaServer's bank balance?

  class PizzaServer { // Fields not related to the balance are omitted... /** This pizzaServer's bank balance (in $). double balance = 0.0; double latestDeposit = 0.0; /** Make a deposit. * @param deposit The amount deposited (in $). */ void addToBalance( double deposit ) { this.latestDeposit = deposit; } /** Return the current balance (including the most recent deposit). * @return the current balance. */ double getBalance() { this.setBalance( this.balance + this.latestDeposit ); return this.balance; } // Methods not directly related to the balance are omitted... // Note that tip(double) and work(double) will both call addToBalance(double). }

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©2007, Ian Barland, Radford University Last modified 2007.Aug.27 (Mon)

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