C null pointer

What is Null Pointer ?

• NULL Pointer is a pointer which is pointing to nothing.
• NULL pointer points the base address of segment.

NULL is macro constant which has been defined in the header file

• stdio.h
• alloc.h
• mem.h
• stddef.h
• stdlib.h as -

#define NULL 0

Visual Representaion :

Some Examples of NULL Pointer

float *ptr=(float *)0;
char *ptr=(char *)0;
double *ptr=(double *)0;
char *ptr='\0';
int *ptr=NULL;