未初始化指针和空指针的区别 [英] Difference between uninitialized and null pointer

问题描述

空指针和未初始化指针有什么区别吗?这个问题是在一次采访中被问到的.你能解释一下它们之间的区别吗?

Is there any difference between null pointer and uninitialized pointer? This question was asked in one of the interviews. Could you please explain the difference that they have?

推荐答案

取一个未初始化的指针:

Take an uninitialized pointer:

int* ptr;//points to any location in memory

取一个空指针:

int* ptr = NULL;//normally points to 0x0 (0)

如果取消引用，两者都会导致未定义的行为.NULL 通常定义为 0.

Both would cause undefined behaviour if dereferenced. NULL is often defined as 0.

这篇关于未初始化指针和空指针的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！