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Grade Averaging and Letter Grade Project  RSS feed

 
Chris Hathaway
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Hello again Javaranch!

I am currently working on a project that asks the user to enter in two test grades for four different students, once you have the test grades, it gives you the average of both of the students test grades, followed by a letter grade to correspond to it.
I have everything working except for the letter grade part!!! I cant figure out how to make it present a letter grade(A, B, C, D, F) based on the average of both test scores.

Here is my code so far!
Please explain your reasoning behind your logic!!!

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William P O'Sullivan
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You need to index into your array of grades using the actual average itself (not the iterator variable).

Also, what happens when there is a fractional value? say 3.5 average.
Array indexes can only be integer!

I would suggest writing a helper method that takes the average as a parameter and returns the grade.
e.g:


WP
 
Chris Hathaway
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Ok I did some messing around and i got it to display the letter, but now its just displaying the wrong letter grade

heres what i added!
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Paul Clapham
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I don't understand why you are changing the values in the "grade" array.
 
Mike Simmons
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I agree with Paul C's comment. Also, consider this: if you had a score of, say, 65, which of those if statements will evaluate to true? I think I know which one you want to be true, but if you look at the code you've actually got written, which one will actually be true first?
 
Vince Stout
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Your if statement does not set the grade, it just jumbles up your 'grades' array. Consider making 'grades' final (that way you cannot manipulate it by mistake), then create a char to set each students grade. However, Williams' suggestion is probably best (using a getGrade method) and cleanest. This way, you could just call the method from your println statement.

Also remember that when you are testing a range of values, there is a beginning, AND an ending parameter or you will have...strange things happen. Yes, as William stated you could also work backwards and evaluate from the bottom up. But in the beginning stages, you'd probably be better off sticking to redundancy as a failsafe, then 'take off the training wheels' so to speak.

- VS
 
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