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NULL    音标拼音: [n'ʌl]
n. 空,零迅号,零
a. 无效力的,无效的,无价值的

空,零迅号,零无效力的,无效的,无价值的

null
空的; 空; 无; 零; 空白; 虚字; 空( 字元 ) NUL

null
空

null
adj 1: lacking any legal or binding force; "null and void" [synonym:
{null}, {void}]
n 1: a quantity of no importance; "it looked like nothing I had
ever seen before"; "reduced to nil all the work we had
done"; "we racked up a pathetic goose egg"; "it was all for
naught"; "I didn't hear zilch about it" [synonym: {nothing},
{nil}, {nix}, {nada}, {null}, {aught}, {cipher}, {cypher},
{goose egg}, {naught}, {zero}, {zilch}, {zip}, {zippo}]

Null \Null\, v. t. [From null, a., or perh. abbrev. from annul.]
To annul. [Obs.] --Milton.
[1913 Webster]


Null \Null\, n. [Etymol. uncertain.]
One of the beads in {nulled work}.
[1913 Webster]


Null \Null\, a. [L. nullus not any, none; ne not ullus any, a
dim. of unus one; cf. F. nul. See {No}, and {One}, and cf.
{None}.]
1. Of no legal or binding force or validity; of no efficacy;
invalid; void; nugatory; useless.
[1913 Webster]

Faultily faultless, icily regular, splendidly null,
Dead perfection; no more. --Tennyson.
[1913 Webster]

2. Having a value of zero; as, of null utility.
[PJC]

3. (Math.) Empty; having no members; as, the null set.
[PJC]

4. (Computers) Unassigned or meaningless; -- a special value
given to variables, especially pointers or logical
variables, indicating that it is meaningless and cannot be
used in computation; as, an uninitialized pointer in "C"
is given a null value. The actual value that is stored in
memory to indicate the null condition may vary with the
computer language used.
[PJC]


Null \Null\, n.
1. Something that has no force or meaning.
[1913 Webster]

2. That which has no value; a cipher; zero. --Bacon.
[1913 Webster]

{Null method} (Physics.), a zero method. See under {Zero}.
[1913 Webster]

51 Moby Thesaurus words for "null":
aimless, bad, bare, barren, bland, blank, bleached, characterless,
clear, designless, devoid, empty, existless, featureless, garbled,
hollow, importless, inane, ineffective, ineffectual, inefficacious,
insignificant, insipid, invalid, lacking, meaningless, minus,
missing, negative, nonconnotative, nondenotative, nonexistent,
null and void, phatic, purportless, purposeless, scrambled,
senseless, unexisting, unmeaning, unrelieved, unsignificant,
useless, vacant, vacuous, void, white, with nothing inside,
without being, without content, worthless

A special value used in several languages to
represent the thing referred to by an uninitialised pointer.

A special value that may be stored in some database
columns to represent an unknown, missing, not applicable, or
undefined value. Nulls are treated completely differently
from ordinary values when evaluating SQL expressions and there
are several SQL constructs for dealing with nulls.

(2003-06-17)


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英文字典中文字典相关资料:


  • NULL Definition Meaning - Merriam-Webster
    Null often pops up in legal and scientific contexts; it was originally used in Scottish law and still carries the meaning "having no legal or binding force," especially in the phrase "null and void "
  • Null (SQL) - Wikipedia
    In the SQL database query language, null or NULL is a special marker used to indicate that a data value does not exist in the database
  • Null - Wikipedia
    Null (SQL) (or NULL), a special marker and keyword in SQL indicating that a data value does not exist, is not known, or is missing Null character, the zero-valued ASCII character, also designated by NUL, often used as a terminator, separator or filler
  • What Is Null? - Computer Hope
    The concept of null and its significance in computing with our comprehensive definition, examples, and explanations Learn how null differs from zero and empty
  • NULL - cppreference. com
    A null pointer constant may be converted to any pointer type; such conversion results in the null pointer value of that type
  • NULL | English meaning - Cambridge Dictionary
    NULL definition: 1 having no legal force: 2 with no value or effect: 3 (of a set or matrix) containing nothing… Learn more
  • null - JavaScript | MDN - MDN Web Docs
    JavaScript is unique to have two nullish values: null and undefined Semantically, their difference is very minor: undefined represents the absence of a value, while null represents the absence of an object
  • NULL Synonyms: 135 Similar and Opposite Words - Merriam-Webster
    Synonyms for NULL: void, invalid, null and void, illegal, inoperative, nugatory, nonbinding, bad; Antonyms of NULL: valid, good, legal, binding, working, worthy, valuable, useful
  • Everything you wanted to know about $null - PowerShell
    What is NULL? You can think of NULL as an unknown or empty value A variable is NULL until you assign a value or an object to it This can be important because there are some commands that require a value and generate errors if the value is NULL
  • NULL - cppreference. com
    The macro NULL is an implementation-defined null pointer constant In C, the macro NULL may have the type void*, but that is not allowed in C++ because null pointer constants cannot have that type int* p = NULL; int* p2 = static_cast<std::nullptr_t>(NULL); void(*f)(int) = NULL; int S::*mp = NULL; void(S::*mfp)(int) = NULL;





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