What is a null pointer?

There are times when it�s necessary to have a pointer that doesn�t point to anything. The macro NULL, defined in <stddef.h>, has a value that�s guaranteed to be different from any valid pointer. NULL is a literal zero, possibly cast to void* or char*. Some people, notably C++ programmers, prefer to use 0 rather than NULL. The null pointer is used in three ways: 1) To stop indirection in a recursive data structure 2) As an error value 3) As a sentinel value

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supriya ahire

Mar 22nd, 2006

hi,
Null pointer: When referring to computer memory, a null pointer is a command used to direct a software program or operating system to an empty location in the computer memory. Commonly, the null pointer is used to denote the end of a memory search or processing event. In computer programming, a null pointer is a pointer that does not point to any object or function.
In the programming language c, NULL is an available command that can be used.
Regards,
Supriya Ahire.