underflow


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underflow

[′ən·dər‚flō]
(computer science)
The generation of a result whose value is smaller than the smallest quantity that can be represented or stored by a computer.

underflow

(programming)
(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.

underflow

(1) An error condition that occurs when the result of a computation is smaller than the smallest quantity the computer can store.

(2) An error condition that occurs when an item is called from an empty stack.
References in periodicals archive ?
To prevent overflow and underflow, we adopt a histogram shifting technique [21] that narrows the histogram from both sides as shown in Fig.
Underflow from the thickener goes to four-stage leaching.
In the proposed QoE monitoring system, the considered QoS metrics include underflow time ratio [QoS.sub.u], packet loss rate [QoS.sub.1], initial playout delay [QoS.sub.d], and normalized playout rate [QoS.sub.r].
Since the change of z with a big value is large after w is embedded into z, which may degrade severely the image imperceptibility and cause easily the situation of overflow and underflow, thus a compression operation on z should be made to decrease the change.
As discussed previously, with a fixed DP at the furthest loop, an underflow occurs when the furthest loop is closed.
[mathematical expression not reproducible]: the mass flow underflow of FeSi, kg/s
Moreover, inexact, underflow, or overflow exceptions are signaled when necessary.
"We use a similar process to check other critical run-time errors, such as the occurrence of overflow, underflow, etc."