空指针和空指针有什么区别? [英] What's the difference between a null pointer and a void pointer?

问题描述

空指针和空指针有什么区别?空指针?

推荐答案

Null pointer 是指针的特殊保留值.任何类型的指针都有这样的保留值.形式上，每个特定的指针类型(int *、char * 等)都有自己专用的空指针值.从概念上讲，当指针具有空值时，它不会指向任何地方.

Null pointer is a special reserved value of a pointer. A pointer of any type has such a reserved value. Formally, each specific pointer type (int *, char * etc.) has its own dedicated null-pointer value. Conceptually, when a pointer has that null value it is not pointing anywhere.

Void pointer 是一个特定的指针 type - void * - 一个指向存储中某个数据位置的指针，它不会有任何特定类型.

Void pointer is a specific pointer type - void * - a pointer that points to some data location in storage, which doesn't have any specific type.

所以，再一次，空指针是一个值，而空指针是一个类型.这些概念完全不同，没有可比性.这基本上意味着您的问题，如上所述，并不完全有效.这就像问，例如，三角形和汽车有什么区别?".

So, once again, null pointer is a value, while void pointer is a type. These concepts are totally different and non-comparable. That essentially means that your question, as stated, is not exactly valid. It is like asking, for example, "What is the difference between a triangle and a car?".

这篇关于空指针和空指针有什么区别?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！