thanks guys!
On Wed, Aug 24, 2011 at 6:37 PM, Don <[email protected]> wrote:
> Yes, the memory provided by malloc will not be in the structure. Only
> the pointer to that memory will be in the structure. The size of a
> struct is defined at compile time, so it can't be dynamically sized at
> run time.
>
> struct junk
> {
> int size;
> int *data;
> };
>
> Somewhere in the code:
>
> struct junk myJunk;
> myJunk.size = n;
> myJunk.data = (int *)malloc(n * sizeof(int));
>
> for(i = 0; i < n; ++i)
> myJunk.data[i] = i;
>
> That should work for values of n which your memory can support.
> sizeof(struct junk) is eight bytes even if it contains a pointer to a
> million integers.
>
> Don
>
> On Aug 24, 11:04 am, sagar pareek <[email protected]> wrote:
> > See if we use dynamic memory allocation then still the size of pointer
> will
> > be 4 bytes only....
> > Mean that int* pointer still have the size equals to pointer ... malloc
> only
> > returns new alloted memory which is now only *pointed *by that pointer
> >
> > check this out :-http://www.ideone.com/20ayq
> >
> >
> >
> > On Wed, Aug 24, 2011 at 8:10 PM, Don <[email protected]> wrote:
> > > If you are working in C++, stl has a vector container class which will
> > > do this. Otherwise, declare an integer pointer in the struct and use
> > > malloc to allocate memory for it. Then you can use it like an array.
> > > Don
> >
> > > On Aug 23, 11:51 pm, Arun Vishwanathan <[email protected]> wrote:
> > > > say that you have a structure with some fields of known size and
> unknown
> > > > size.For example, a char, an integer and an integer array.I do not
> know
> > > the
> > > > size of the integer array until the user mentions the number of bytes
> he
> > > > needs this integer array to cover in the command line as an
> argument.Is
> > > it
> > > > possible to have a structure with an integer dynamic array?
> >
> > > > Arun
> >
> > > > --
> > > > "People often say that motivation doesn't last. Well, neither does
> > > bathing
> > > > - that's why we recommend it daily."
> >
> > > --
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> >
> > --
> > **Regards
> > SAGAR PAREEK
> > COMPUTER SCIENCE AND ENGINEERING
> > NIT ALLAHABAD
>
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--
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- that's why we recommend it daily."
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