[ale] C and segmentation fault

[tew at wiencko.com (Tom Wiencko)]

c_fowler at hotmail.com wrote:
> 
> Why when I run this proggie do I get a segmentation fault?
> 
#include<stdio.h>
#include<string.h>
main()
{
        char *s1;
        char *s2;
        s1="S1";
        s2="S2";
        s2=strcat(s1,s2);
        return 0;
}

Very simple.  The line "s2=strcat(s1,s2)" is causing strcat to
try to physically overwrite the read-only memory space where "S2"
lives.  When you assigned s2="S2" you are pointing s2 to an address
in an area where only constants are supposed to live.  You cannot
modify things in that address space.

-Tom
----------------------------------------------------------------------
Tom Wiencko                                            tew at wiencko.com
President - Wiencko & Associates, Inc.