'UP'
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If the I/O rounding is set to the smallest representable value that is greater than or equal to the original value.
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'DOWN'
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If the I/O rounding is set to the largest representable value that is less than or equal to the original value.
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'ZERO'
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If the I/O rounding is set to the value closest to the original value, but no greater in magnitude than the original value.
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'NEAREST'
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Conforms to the ISO/IEC/IEEE 60559:2011 standard specification for roundTiesToEven.
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'COMPATIBLE'
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If the I/O rounding is set to the closer of the two nearest representable values, or the value farther from zero if halfway between them.
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'PROCESSOR_DEFINED'
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If the I/O rounding mode behaves differently than the UP, DOWN, ZERO, NEAREST, and COMPATIBLE modes.
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'UNDEFINED'
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If there is no connection or if the connection is not for formatted I/O.
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