techpreparation-homepage

Home  Interview Questions  Certifications  Aptitude Questions  Tutorials  Placement Papers  Search  Resume  Soft Skills  Video  Forum  Blog

Android app on Google Play

Technical Interview Questions

Java Interview Questions
Unix Interview Questions
SQL Interview Questions
C# Interview Questions
                              .........More

Aptitude Interview Questions
C/C++ Aptitude Questions
C Aptitude Questions
                              .........More

Tutorials
C Tutorial
C++ Tutorial
                              .........More

Programming Source Codes
C/C++ Source Codes
C# Source Codes
                              .........More

Online Quiz
C Online Quiz
C++ Online Quiz
                              .........More

 

 
Home > C Interview Questions >

What is a null pointer?

There are times when itís necessary to have a pointer that doesnít point to anything. The macro NULL, defined in , has a value thatís 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. 

<< Go Back to C Interview Questions. 

Have a Question ? post your questions here. It will be answered as soon as possible.

Check Object Oriented Interview Questions for more Object Oriented Interview Questions with answers

Check Data Structure Interview Questions for more data structure interview questions with answers