Explanatory Question

What is NULL in C?

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Answer with Explanation

NULL is a macro which is 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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