What is NULL in C?

Answer:

-NULL is a macro which defined in C header files. The value of NULL macro is 0. It is defined in C header files as below:
#define NULL (void *) 0;
-NULL is used for pointers only as it is defined as (void *) 0. It should not be used other than pointers. If NULL is assigned to a pointer, then pointer is pointing to nothing.

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