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Which line rests on a mistaken assumption?

public class Sample43
{
    public static void main(String[] args)
    {
        assert Math.round(-2.5) == -3 : Math.round(-2.5);
        System.out.println(Math.round(-2.5));
    }
}

  • A.public static void main(String[] args)
  • B.Every line above is correct as written.
  • C.assert Math.round(-2.5) == -3 : Math.round(-2.5);
  • D.System.out.println(Math.round(-2.5));

Answer: C

Math.round adds one half and takes the floor, so a value exactly halfway rounds toward positive infinity: -2.5 becomes -2, not -3. The assertion assumes rounding moves away from zero on both sides, which holds for positive halves only.

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