Thanks to everyone who offered answers to my question. It's starting to make
sense now. Hope you don't mind if I dig a little further.
If I understand correctly, char s1[]= "Hello"; puts that array of characters
(plus the NULL) on the stack. Could I then execute something like
printf("%s", s1) and have it print Hello? If true, when that printf runs,
how does it know which bytes to pull off the stack. I might have added
additional things to the stack, so how does it know where to find it if
there is no pointer to it? If I could understand that, I'd really be getting
somewhere. Thanks.
Mitch
> -----Original Message-----
> From: Greg Winton [SMTP:[EMAIL PROTECTED]]
> Sent: Wednesday, March 10, 1999 12:48 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Variable storage question
>
> At 12:18 PM 3/10/99 -0500, you wrote:
> >> char s1[]= "Hello"; // array of characters
> >> CharPtr s2; // pointer to a string
> >> char s3[20]; // array of 20 caharacters
> >> CharPtr s4[10]; // array of 10 pointers
> >> int i; // integer
> >> int j[10]; // array of 10 integers
> >>
> >> s2 = "Goodbye";
> >> i = 15;
> >>
> >
> > In your example, s, s2, s3, s4, i, and j are all on the stack
> (total
> >usage 92 bytes, assuming ints are 2 bytes), and where that constant
> string
> >lives depends on your compiler settings. I'll let the compiler jockeys
> >figure out where that one goes - it's probably in your global data, which
> I
> >think is on the heap, but don't quote me. If you wanted to allocate one
> of
> >your arrays on the heap, you'd declare it as a pointer and use MemPtrNew
> to
> >allocate it.
> >
>
> I'm no compiler jockey, but the declaration for s1 will allocate 6 bytes
> on
> the stack, and initialize it to "Hello\0". This is because you declared
> it
> as a non-const array.
>
> const char s1[] = "Hello";
>
> would have generated 6 bytes for the string "Hello" and 4 bytes for the
> pointers (s1 and sP) to these strings.
>
> Hope this helps.
>
> Regards,
> Greg
>
> Greg Winton
> Bachmann Software and Services, LLC
> mailto:[EMAIL PROTECTED]
> http://www.bachmannsoftware.com
> Software Development for Handheld & Mobile Computing, Windows and the
> Internet
> Home of Bachmann Print Manager, the only graphical printing solution for
> the Palm Computing Platform
>
