undefined [,ʌndi'faind]

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adj. ����ȷ�ģ�δ�¶����

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a. vague

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a.   defined

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1. Using an undefined member in any way other than as the target of an assignment is an error.
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2. The environment variable(s) specified in the debugging information file path are undefined.
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3. Floating to Floating conversions are defined only if N is representable; if it is not, the conversion has undefined behavior.
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adj.
  1. not precisely limited, determined, or distinguished

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Undefined
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undefined variable
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undefined structure
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undefined behavior
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undefined operation
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