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underflow    
下溢

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underflow
下溢; 缺; 欠位; 超下限; 低於下限

underflow
下溢

(or "floating point underflow", "floating
underflow", after "{overflow}") A condition that can occur
when the result of a {floating-point} operation would be
smaller in magnitude (closer to zero, either positive or
negative) than the smallest quantity representable. Underflow
is actually (negative) {overflow} of the {exponent} of the
{floating point} quantity. For example, an eight-bit {twos
complement} exponent can represent multipliers of 2^-128 to
2^127. A result less than 2^-128 would cause underflow.

Depending on the {processor}, the programming language and the
{run-time system}, underflow may set a status bit, raise an
{exception} or generate a {hardware} {interrupt} or some
combination of these effects. Alternatively, it may just be
ignored and zero substituted for the unrepresentable value,
though this might lead to a later {divide by zero} error which
cannot be so easily ignored.

(2006-11-09)


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