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<NaN> returned for my Junit test case  RSS feed

 
Stephen Shaw
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Here is the complete code for my class and my test class. I've highlighted the problem areas and described the problem below.



Start of test class:


I'm working on a lab for school but blueJ is telling me that my surrenderValue is returning "NaN" (which I know is Not a Number). I believe the issue is with the objects I am trying to use in the calculation in my WholeLifePolicy class's surrenderVal method. Any help asap would be greatly appreciated.


 
Ernest Friedman-Hill
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In this constructor:



What you want to do is put the values of the parameters into the member variables. Is that what those three assignments are doing? Or are they maybe doing exactly the opposite?

Or to put it another way, dividing by 0 gives a NaN. If policyYrs were to remain zero after this constructor, then the value you're testing would be NaN. Are you sure policyYrs is not zero?
 
Stephen Shaw
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Thank you!

You were right, I had them reversed. I would have never noticed if it wasn't for you, thanks. I'll be keeping this place bookmarked from now on. I can see how much you guys will help my learning.
 
Campbell Ritchie
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Welcome to the Ranch

More precisely, you get NaN if you divide 0 by 0, but it only works in floating-point arithmetic. In floating point, if you divide anything else by 0 you get (±)∞, and in integer arithmetic you get an Exception if you divide by 0.
 
It is sorta covered in the JavaRanch Style Guide.
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