null是什麽意思

null

英 [nʌl] 美 [nʌl]

adj. 無效的，無價值的；等於零的
n. 零，[數] 空

英文詞源

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).

雙語例句

1. A spokeswoman said the agreement had been declared null and void.: 女發言人稱該協議已宣布無效。

2. Failure. The NULL value has been passed as a parameter.: 失敗. 將空指針NULL傳給了一個參數.

3. If mem block is NULL, pointer is ignored and free immediately returns.: 如果NULL內存塊,操作將被忽略並且函數立即返回.

4. This function returns the removed node on success, or NULL on failure.: 這個函數如果執行成功,將返回被刪除的子節點;如果執行失敗, 將返回null[空值].

5. A pointer to a NULL - terminated string representing a device instance identifier.: 指向一個以NULL結尾的字符串,象征設備實例描述符.

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