Cofusion regarding NULL macro

[Bargi]

Hi!
I have a confusion regarding NULL macro.
Since ascii value of NULL is 0 ,so instead of using 0 why we used NULL macro for comparison
purpose.
Is it due to logical reason or something else?

Please explain it...

Thanks

Bargi

[vart]

when you read the code

p == NULL - you understand that here it suposed to be used the pointer comparison

when you see
p == 0 - you cannot be sure is this code suppose to be

p == NULL
or
*p == 0

Also when you write
*p == NULL compiler will warn you that you comparing pointer value to non-pointer value...

So using this macro helps to prevent different typing errors

[whiteflags]

> So using this macro helps to prevent different typing errors
There is no right answer.
http://c-faq.com/null/nullor0.html

[KIBO]

In C, NULL is often defined as ((void *)0) which makes it impossible to accidently do:

int x = NULL;

In C++ NULL cant be defined with a cast to void * because void * cant be converted to any other type automatically