在C语言中，NULL指针和指向0的指针之间是否有区别?如果是这样，该怎么办? [英] In C, is there a difference between a NULL pointer and a pointer that points to 0? If so, what?

问题描述

在C语言中，NULL指针和指向0的指针之间有什么区别?

In C, what is the difference between a NULL pointer and a pointer that points to 0?

推荐答案

6.3.2.3 Pointers

3值为0的整数常量表达式，或这样的表达式 强制类型转换为void *，称为空指针常量.55)如果为空 将指针常量转换为指针类型，结果 指针，称为空指针，保证将不等于与 指向任何对象或函数的指针

3 An integer constant expression with the value 0, or such an expression cast to type void *, is called a null pointer constant.55) If a null pointer constant is converted to a pointer type, the resulting pointer, called a null pointer, is guaranteed to compare unequal to a pointer to any object or function

宏NULL扩展为实现定义的空指针常量.

The macro NULL expands to an implementation-defined null pointer constant.

任何两个空指针都应相等.

Any two null pointers shall compare equal.

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