RE: [Dev-C++] dynamic allocation and structs

What was the final answer to the the original question asked:
"what is the duration of memory allocated by malloc (etc.)? "

If not freed manually or by a destructor, Does the memory ALWAYS get
released when the main() program ends with a normal exit  ? 


--- Scott Williams <se...@al...> wrote:
> Thanks for the replies to my question (and the entertaining discussion
> it
> led to).  It was all very helpful.
> 
> Scott
> 
> -----Original Message-----
> From: Per Westermark [mailto:pw...@ia...]
> Sent: Thursday, October 24, 2002 9:13 AM
> To: Scott Williams
> Cc: dev...@li...
> Subject: Re: [Dev-C++] dynamic allocation and structs
> 
> 
> 
> // Alternative 1, array of entries.
> mystruct *myarray;
> void func(int count) {
>     int i;
>     myarray = (mystruct*)malloc(count*sizeof(mystruct));
>     for (i = 0; i < count; i++) {
>         myarray[i].xx = yy;
>     }
> }
> 
> // Alternative 2, array of pointers to entries.
> mystruct **myarray;
> void func(int count) {
>     int i;
>     myarray = (mystruct**)malloc(count*sizeof(*mystruct));
>     for (i = 0; i < count; i++) {
>         myarray[i] = (mystruct*)malloc(sizeof(mystruct));
>         myarray[i]->xx = yy;
>     }
> }
> 
> /Per W
> 
> On Thu, 24 Oct 2002, Scott Williams wrote:
> 
> > Hi,
> >
> > I'm working in C (no C++ please).  Got a couple of questions related
> to
> > dynamic allocation and in particular, dynamically allocating an array
> of
> > structs.
> >
> > First, what is the duration of memory allocated by malloc (etc.)?  In
> > particular, I want to dynamically allocate/de-allocate several global
> > variables within a single subroutine called from main and so want to
> be
> sure
> > that the allocated memory exists beyond the scope of that subroutine.
> >
> > Second, it is my understanding that it is perfectly acceptable to have
> an
> > array of structs.  E.g.,
> >
> > struct mystruct {
> >   double var1;
> >   long   var2;
> >   etc...
> > }
> >
> > . . .
> >
> > struct mystruct data[100];
> >
> > Is this correct?  If so, what then is the calling sequence to
> dynamically
> > allocate an array of structs, and, in particularly, make the result
> > available globally?
> >
> > Thanks for your help (& sorry if this is naive).
> >
> > Scott Williams
> >
> >
> >
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