In this tutorial, you will learn about thedangling pointer,void pointer,NULL, andwild pointerin C. I have already written a brief article on these topics. The main aim of this blog post to give you a quick introduction to these important concepts. Also, I will describe different states of...
A pointer that doesn’t point to any memory location is called a Null Pointer in C.It saves the segment’s base address.While void is the pointer’s type, the null pointer essentially holds the Null value. Syntax : int * ptr = NULL; Null Pointers : A pointer is referred to as a n...
Void pointeris a specific pointertype-void *- a pointer that points to some data location in storage, which doesn't have any specific type. So, once again,null pointeris avalue, whilevoid pointeris atype. These concepts are totally different and non-comparable....
[Thevoidtype of pointer is a special type of pointer. In C++,voidrepresents the absence of type. Therefore,voidpointers are pointers that point to a value that has no type (and thus also an undetermined length and undetermined dereferencing properties). This givesvoidpointers a great flexibility...
There are times when it’s necessary to have a pointer that doesn’t point to anything. The macro NULL, defined in , has a value that’s guaranteed to be different from any valid pointer. NULL is a literal zero, possibly cast to void* or char*. Some people, notably C++ programmers,...
What is a Null Pointer in C? An integer constant expression with the value 0, or such an expression cast to typevoid *, is called a null pointer constant. The macro NULL is defined in<stddef.h>(and other headers) as a null pointer constant; It expands to an implementation-defined null...
反过来说,任何对象或者函数的地址都不可能是空指针。(tyc: 比如这里的(void*)0就是一个空指针。把它理解为null pointer还是null pointer constant会有微秒的不同,当然也不是紧要了 那么什么是NULL?? [6.3.2.3-Footnote] The macro NULL is defined in <stddef.h> (and other headers) as a null pointer ...
Learn: What is the NULL pointer in C language? When NULL pointer requires and what is the value of a NULL Macro? As we have discussed in chapter "Pointers Declarations in C programming language" that a pointer variable stores the address of another variable. But sometimes if we do not wan...
反过来说,任何对象或者函数的地址都不可能是空指针。(tyc: 比如这里的(void*)0就是一个空指针。把它理解为null pointer还是null pointer constant会有微秒的不同,当然也不是紧要了 那么什么是NULL?? [6.3.2.3-Footnote] The macro NULL is defined in <stddef.h> (and other headers) as a null pointer ...
[6.3.2.3-Footnote] The macro NULL is defined in <stddef.h> (and other headers) as a null pointer constant 即NULL 是一个标准规定的宏定义,用来表示空指针常量。因此可以用 a = NULL; 来使 a 成为一个空指针。(tyc:很多系统中的实现:#define NULL (void*)0,与这里的“a null pointer constant”...