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null是什么意思

2024-01-27 09:16:17
null
美[nʌl]  英[nʌl]
adj.  无效的;无价值的;无效力的
n.  零;空
vt.  使无效
  过去式:nulled  过去分词:nulled  现在分词:nulling  第三人称单数:nulls
  近义词:worthless,invalid,valueless,insignificant,useless,void,nullandvoid,unacceptable,unsound,untrue,unimportant,ineffectual,nonexistent,piddling,inoperative,immaterial,blank,trivial,inexistent,clear,hollow,trifling,no-good,inutile,bare,empty,unsubstantial,unprofitable,foolish,good-for-nothing,vacuous,nugatory,inane,purposeless,inconsequential,futile,senseless,unavailing,inefficacious,extinguished,destroyed,annihilated,expunged,obliterated,exterminated,effaced,dissolved,extirpated,eliminated,binding,not,naught,Nada,Zippo,nil,nix,gooseegg,zip,aught,cipher,zero,nothing,zilch,cypher,

详细释义

adj.(形容词)
  1. 无效的,无效力的,无用的,无益的
  2. 无价值的
  3. 无束缚力的
  4. 等于零的,零值的
  5. 【数】零的,空的
  6. 没特征的,没表情的
  7. 不存在的,没有的
  8. 零(位)的
  9. 毫不引起注意的
  10. 无法律效力的
n.(名词)
  1. 【数】零,零位,空
  2. 【无线电】零讯号,微弱讯号
  3. 平衡
  4. 无感点
  5. 静音点
v.(动词)
  1. 使无效
  2. 在零位
  3. 使恢复零位

英英释义

Noun
  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 didnt hear zilch about it"

Adjective
  1. lacking any legal or binding force;

    "null and void"

例句

用作形容词(adj.)
  1. Their actions rendered the contract null and void.他们的行为使合同无效。
  2. The marriage was declared null and void.婚姻已宣告无效了。
用作名词(n.)
  1. The path must end with a null character.该路经必须以零结尾。
  2. Vomit in null gravity wouldnt be fun.如果在零重力下呕吐了可不是件好笑的事。
  3. A null reference pointer was passed to the stub.向占位程序传送了空的索引指针。
  4. Primary keys do not allow null values.主键不允许空值。