underflow

un·der·flow

U0051200 (ŭn′dər-flō′)n. A data-processing error arising when the absolute value of a computed quantity is smaller than the limits of precision of the computing device, retaining at least one significant digit.

underflow

(ˈʌndəˌfləʊ) n1. (Physical Geography) another word for undercurrent2. (Computer Science) computing a condition that occurs when arithmetic operations produce results too small to store in the available register

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", "floatingunderflow", after "overflow") A condition that can occurwhen the result of a floating-point operation would besmaller in magnitude (closer to zero, either positive ornegative) than the smallest quantity representable. Underflowis actually (negative) overflow of the exponent of thefloating point quantity. For example, an eight-bit twos complement exponent can represent multipliers of 2^-128 to2^127. A result less than 2^-128 would cause underflow.

Depending on the processor, the programming language and therun-time system, underflow may set a status bit, raise anexception or generate a hardware interrupt or somecombination of these effects. Alternatively, it may just beignored and zero substituted for the unrepresentable value,though this might lead to a later divide by zero error whichcannot 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.

单词	underflow
释义	underflow un·der·flow U0051200 (ŭn′dər-flō′)n. A data-processing error arising when the absolute value of a computed quantity is smaller than the limits of precision of the computing device, retaining at least one significant digit. underflow (ˈʌndəˌfləʊ) n1. (Physical Geography) another word for undercurrent2. (Computer Science) computing a condition that occurs when arithmetic operations produce results too small to store in the available register underflow 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", "floatingunderflow", after "overflow") A condition that can occurwhen the result of a floating-point operation would besmaller in magnitude (closer to zero, either positive ornegative) than the smallest quantity representable. Underflowis actually (negative) overflow of the exponent of thefloating point quantity. For example, an eight-bit twos complement exponent can represent multipliers of 2^-128 to2^127. A result less than 2^-128 would cause underflow. Depending on the processor, the programming language and therun-time system, underflow may set a status bit, raise anexception or generate a hardware interrupt or somecombination of these effects. Alternatively, it may just beignored and zero substituted for the unrepresentable value,though this might lead to a later divide by zero error whichcannot 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. See UDF See UDFThesaurusSeeundercurrent
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