[9fans] constant string

[Prem Mallappa <prem_mallappa@hotpop.com>]

hi,

this is my program
------------------------------------------
#include <stdio.h>

int main(void)
{
	char *s = "Hello";
	
	s[2] = 'z';
	
	printf ("%s\n", s);
	
	return 0;
}

------------------------------------------

my question is when i compile this in Linux (gcc) i get a segmentation 
fault at the second statement of main(),
As far as my knowledge i think this is because in 2nd chapter of K&R book
it is being mentioned that
' any thing enclosed between " and " is a string constant' so here i am
changing a constant, and i get a segmentation fault ( and i also noticed
that gcc stores the string Hello in read-only datasegment)

but when i compile the same thing in plan9 C compiler ( both native "8c"
and "pcc" i get a output of "Hezlo")
why this is happenning..

sorry if i am posting to wrong group,
thanks in advance
prem