Hui Buddies can anyone tell me what is a NULL Macro? What is the difference between a NULL Pointer and a NULL Macro?

Null macro is defined in stdio.h and stddef.h.It is used to represent a null pointer in your code.

its value is zero.

Null pointer is same as an uninitialized pointer..It does not point anywhere.

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A NULL pointer is a pointer that's guarnteed to point to nothing. This may be 0 in a UNIX/Linux system or some other address in another system

Using the NULL macro to set/initialize your pointers will make your programs more portable among systems than using something like the 0.

NULL Macro is simply what is defined as 0 in a macro provided by the library

Null pointer is a pointer which has 0 or NULL value stored and points to nowwhere still it points to 0x00 i.e. the first memory location of the OS

Null pointer != Uninitialized pointer because an uninitialised pointer can point anywhere in the memory location ...but a NULL pointer surely points to no where(but still behind the scene we can say that it only points to 0x00). Never we can retrive a Null pointer location using th"&" operator..neither will malloc/calloc return NULL IF THERE IS SPACE IN THE MEMORY. NULL pointer is unique !!

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