Does the % drop the decimal before or after calculation? Student needs help

I'm a student taking a course on Java at home and I need to know if in a calculation, the % switch drops the decimal before or after calculation?

% as in mod, as in remainder? I believe this only works on int/long values, in which case, it would probably be before... but I have been known to be wrong.

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    [\code]

    In your example you selected the pair with the greatest
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    The most obvious approach is to systematically try
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    step. After all possible choices of the previous step,
    backtrack one more step and so on.
    This seems rather involved, and it probably is.
    Interestingly, if you know Prolog, it is ridiculously
    easy because Prolog does all the backtracking for you.
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    way as Prolog implementations do it--keep a list of all the
    choice points and work through them until success or there
    are none left.
    If you do know Prolog, you could generate lots of random
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