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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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  • 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 - 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
  • 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
  • A quick and thorough guide to ‘null’: what it is, and how you should use it
    null is a fundamental concept in many programming languages It is ubiquitous in all kinds of source code written in these languages So it is essential to fully grasp the idea of null We have to understand its semantics and implementation, and we need to know how to use null in our source code
  • Null - Glossary - MDN
    In computer science, a null value represents a reference that points, generally intentionally, to a nonexistent or invalid object or address The meaning of a null reference varies among language implementations
  • 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
  • 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
  • earth :: a global map of wind, weather, and ocean conditions
    See current wind, weather, ocean, and pollution conditions, as forecast by supercomputers, on an interactive animated map Updated every three hours
  • 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
  • NULL - cppreference. com
    POSIX requires NULL to be defined as an integer constant expression with the value 0 cast to void*





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