null

英 [nʌl]      美
  • adj. 无效的,无价值的;等于零的
  • n. 零,[数] 空
星级词汇:
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记忆单词“null”可以采用以下方法:

想象“null”是一个空心的球体(n),中间没有内容(ull)。这个空心的球体可以代表“null”一词的含义,即“无”或“零”。通过这个图像,你可以快速回忆起“null”的含义。

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null (adj.)
"void of legal force," 1560s, from Middle French nul, from Latin nullus "not any, none," from ne- "not, no" (see un-) + illus "any," diminutive of unus "one" (see one).
1. A spokeswoman said the agreement had been declared null and void.
女发言人称该协议已宣布无效。
2. Failure. The NULL value has been passed as a parameter.
失败. 将空指针NULL传给了一个参数.
3. If mem block is NULL, pointer is ignored and free immediately returns.
如果NULL内存块,操作将被忽略并且函数立即返回.
4. This function returns the removed node on success, or NULL on failure.
这个函数如果执行成功,将返回被删除的子节点;如果执行失败, 将返回null[空值].
5. A pointer to a NULL - terminated string representing a device instance identifier.
指向一个以NULL结尾的字符串,象征设备实例描述符.