Session Aims and Instructions

Classes in C++
[Savitch 6.2, 7.1; Stroustrup 10.1-2.2,10.3.1; Horstmann 8]

• Slides
• Lab exercise
• Lab exercise solutions (only available after the lab session)

  Model solutions for this lab session:

  • account.cc
  • lab2.cc

  • Yes, the solutions represent the balance as a long (**NOT** floating point!) number, because floating point numbers lose accuracy and so are never used for representing money.
    See here why floating-point numbers are very bad for representing money: https://stackoverflow.com/questions/3730019/why-not-use-double-or-float-to-represent-currency
    Here are the SQL data types used in two well-known databases - check money (decimal is a fixed-point number, so not a floating-point number, so an integer):
    • https://msdn.microsoft.com/en-us/library/cc716729%28v=vs.110%29.aspx
    • https://docs.oracle.com/html/B10544_01/apa.htm
  • Can you see how account deposit re-uses the account constructor to implement itself and how withdraw re-uses deposit?
    Never copy-paste code - re-use it!

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