[c-prog] Re: Problem with dynamic memory allocation

[John]

--- In c-prog@yahoogroups.com, Tyler Littlefield <ty...@...> wrote:
>
> Second, you allocate a block of memory of 40 bytes, or 10 integers

Actaully the OP only allocates space for 10 bytes, not integers. Hence even 
i[2] consists partly of unallocated memory.

The reason you aren't seeing a crash is that the compiler (actually it will be 
the OS) has probably allocated a larger block of memory than you asked for, and 
there aren't any additional run-time checks that might detect the invalid 
accesses.

The program is still wrong however, and in fact I do see a crash when free() is 
called on my system (linux, g++).

Using malloc() it should be:

  i = (int *)malloc((SIZE + EXTRA) * sizeof(int));

But as Tyler says, in C++ you should be using new().