Benno wrote:
On Tue Nov 22, 2005 at 17:35:23 +1100, Benno wrote:
On Tue Nov 22, 2005 at 13:51:59 +0800, [EMAIL PROTECTED] wrote:
Ummmm ...
Coding 3.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
char *
somefunction()
{
char *string2 = "some words";
return string2;
}
int main (void)
{
char *string;
string = somefunction();
printf ("\n\nString is: %s\n\n", string);
return 0;
}
somefunction returns string2 which is trash!
formally: The scope of string2 does not extend to main!
(even if it works, and it might, it's WRONG)
"some words" will be allocated in the .rodata section not on the stack
so it will actually work. (Not that I'd recommend doing this!!).
I can't find anything in the C spec about return the address of a string
literal,
it doesn't say wether it is allowed or not.
I can't actually find it in the C spec but from googling it does appear
that string literals are constants with static storage duration which
means they have lifetime of the program.
(But I still wouldn't use that style, it is confusing at best.)
Try compiling my codes with '-g' and run 'gdb'.
Benno
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