What is a null pointer?

Question:What is a null pointer??

Answer: </I>There are times when it's necessary to have a pointer that doesn't point to anything. The macro NULL, defined in &lt;stddef.h&gt;, 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. &nbsp;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 &nbsp;

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