Under what circumstances can malloc return NULL?

Question

It has never happened to me, and I\'ve programming for years now.

Can someone give me an example of a non-trivial program in which malloc will actually

Answer 1

Just check the manual page of malloc.

On success, a pointer to the memory block allocated by the function.
The type of this pointer is always void*, which can be cast to the desired type of data pointer in order to be dereferenceable.
If the function failed to allocate the requested block of memory, a null pointer is returned.