[Java] Choose The Correct RoundingMode For Checking Decimal OutOfBounds #14731
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Signed-off-by: Raza Jafri <[email protected]> Added tests
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ttnghia
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Jan 10, 2024
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ttnghia
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| // In ex:1 If we rounded down the rhs 100.19 would become 100.1, and now 100.1 is not < 100.1 | ||
| // In ex:2 If we rounded up the rhs -100.19 would become -100.2, and now -100.2 is not < -100.2 |
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So what are the correct rounding for these examples? I'm confused. Please be explicit.
ttnghia
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Jan 10, 2024
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| // First we have to round the scalar (rhs) to the same scale as lhs. | ||
| // Because this is a greater-than, and it is rhs that we are rounding, we will round towards 0 (DOWN) in case rhs is | ||
| // positive and away from 0 (UP) if rhs is negative to make sure we always return the correct value. | ||
| // For example: | ||
| // ex:1 100.2 > 100.19 | ||
| // ex:2 -100.1 > -100.19 | ||
| // In ex:1 If we rounded up the rhs 100.19 would become 100.2, and now 100.2 is not > 100.2 | ||
| // In ex:2 If we rounded down the rhs -100.19 would become -100.1, and now -100.1 is not > -100.1 | ||
| BigDecimal roundedRhs = rhs.setScale(-cvScale, rhs.signum() > 0 ? BigDecimal.ROUND_DOWN : BigDecimal.ROUND_UP); |
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This is just repeated of the code above. We should not copy-paste code around. If there is the same code used multiple times, let's extract it into a function and call it multiple times instead.
jlowe
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Jan 10, 2024
jlowe
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Jan 10, 2024
Co-authored-by: Jason Lowe <[email protected]>
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jlowe
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Jan 10, 2024
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revans2
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Jan 11, 2024
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Description
This PR fixes an error in the
outOfBoundsmethod in which theRoundingModewas selected based on positive values only. The RHS should be rounded towards positive infinity (ROUND_CEILING) for the lower bound and towards negative infinity (ROUND_FLOOR) for the upper boundcloses #14732
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