How to modify an initialised string
 

Hi,

here is small segment of code:
Iam getting SEGMENTATION FAULT because of the statement
why it is so ???
And, how to change the content of the above string??

Thanks in advance

Dileep

you're derefrencing it. meaning when you change src[0] to L, you're actually changing the first part of the address it points to. when you call printf, printf tries to print from some nonexistant address, and you segfault.

try changing it to:

src[0]='L'

#include <stdio.h>
main()
{
char *src="linux";
src[0]='L';
printf("%s",src);
}

This code gives me a segfault...

erm, what are you compiling it with?

If it's strict it might be worth adding in

return 0;

gcc 3.4.2

Well, this _does_ segault too:
#include <stdio.h>
int main()
{
char *src="linux";
src[0]='L';
printf("%s",src);
return 0;
}

A preinitialized string is a constant. At least, we shouldn't modify it because it points to a data area that's not writable by us (I think). This works:

#include <stdio.h>
main()
{
char *src = malloc(6);
strcpy(src, "linux");
printf("%s\n", src);
*(src+0)='L';
printf("%s\n", src);
return 0;
}

So it's not actually a problem with Linux, but with the program itself..