[algogeeks] Allocating memory of size 0

[Prakhar Jain]

Hi everyone,

Someone plz explain why this C code works fine as memory allocated is of 0
size...

main()
{
  int *p=malloc(0);
  *p=2566;
  printf(%d\n,*p);
  getchar();
}

-- 
Prakhar Jain
IIIT Allahabad
B.Tech IT 3rd Year
Mob no: +91 9454992196
E-mail: rit2009...@iiita.ac.in
  jprakha...@gmail.com

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Re: [algogeeks] Allocating memory of size 0

[Karthikeyan V.B]

It does not return a valid address.

The result of malloc(0) is implementation defined and therefore unreliable.

Some compiler implementations will cause it to return a NULL pointer,
others may return some other value (but it still can't/shouldn't be used to
access memory).

The memory cannot be used, (however it may require free()ing).

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