Basic and Advance C Question: Download Questions PDF
What is a null pointer in C?
Answer:
There are times when it’s necessary to have a pointer that doesn’t point to anything. The macro NULL, defined in , 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
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
Download C Programming Interview Questions And Answers
PDF
| Previous Question | Next Question |
| When should a type cast be used? | What is the stack in C? |