ITEC 120 2008fall aaray, ejderrick, ibarland, jmdymacek

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lect07b
Decisions!

1. compute student exam average. (Or, batting average.) What's the average at the start of the semester, according to MLB? (Note that mathematically, the average is truly undefined.)
   See Student.java: before changes, and after changes..

2. bank account withdrawl, including numTransations. Compute the transaction fee correctly (only after a certain #transaction).
   See BankAccount.java: before changes, and after changes..

   We also discussed:

   • how it matters whether we compare using < or using <=,
   • how it matters whether we update the transaction count before or after we make that comparison.
   • Indentation matters! (To any human reading your program, including the grader.)
   • factoring out common code: In the "after changes" code, we decided that we didn't want the same code repeated inside both deposit and withdraw. Our solution? We made another method, updateTransactionCount, and we called that method from each of deposit,withdraw. Doing so led us to the implicit variable “this”.

3. We compare numbers with >, >=, <, <=, ==, and !=.

4. Don't confuse = and ==!

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©2008, Ian Barland, Radford University Last modified 2008.Oct.15 (Wed)

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