null pointer

常见例句

NULL is defined simply as a null pointer (0) because the null pointer is invalid as a pointer anyway.
NULL 被简单地定义为一个空指针（0），因为无论如何空指针都不是合法的指针。
Instead of defining a separate class for empty lists, it represents empty lists by putting a null pointer in both fields.
它在两个域中都放置一个空指针来表示空链表，而不是为空链表定义一个单独的类。
Unlike, for example, a class-cast exception, a null-pointer exception says nothing about what was expected instead of the null pointer.
例如，不像一个类转型异常，空指针异常不给出它所需要的内容的任何信息，只有一个空指针。