NULL is defined as either 0 or (void*)0. These values are almost identical; either a literal zero or a void pointer is converted automatically to any kind of pointer, as necessary, whenever a pointer is needed (although the compiler can?t always tell when a pointer is needed).

#include<stdio.h>
int main()
{
if(NULL==(void *)0)
printf("true");
else
printf("false");

if(NULL == 0)
printf(" Value is zero");
getch();
}
This gives the output as
True
Value is Zero

NULL in c is defined as a macro in stdio.h as
#define NULL 0
as we know that we don't have to include the stdio directive we can access the NULL

it's depend on system but default is zero....

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