OSDev.org

I'm using a 64 bit system with Ubuntu. For every program I write that does anything more than

printf("name of program + copyright\n");

when I run it the konsole always says : "core dump segmentation fault"

or something like that , what could be the problem

I suppose the real question is.. what "more" are you doing after the printf?

Seriously man, http://catb.org/~esr/faqs/smart-questions.html

i remember the good old days when i programmed on windows and it accepted code like this then i switched to linux and it segfault'd

c needs to be pointing somewhere valid....

Coping up with segmentation faults
-----------------------------------------
You should learn how to use gdb properly ...
when compiling use the g flag .. eg gcc -g <urfile> -o<outputfile>
The run ur program in gdb ... eg gdb outputfile ...
at the gdb prompt use break <line no or func name > to use breakpoints
... use next and step to go through your code ... up and down etc for going up and down frames ... use print <variable name > to view variables in gdb prompt ..use list view source file etc .... There is more to gdb than this ... i just gave a quick summary ... use gdb effectively to sqat out your bugs

Pyrofan1 Posted: Mon Feb 11, 2008 4:53 am Post subject:

i remember the good old days when i programmed on windows and it accepted code like this Code:

char *c;

gets(c);


then i switched to linux and it segfault'd

It should segfault for your program's and your good .... When you declare a pointer like that it is pointing to a random address ... It will seg fault in windows also ... but you may be able to run it in dos using turbo C or some legacy compilers ... you should always use malloc before using gets(c) .... You have made a conceptually erraneous statement ....

Pyrofan1 wrote:i remember the good old days when i programmed on windows and it accepted code like this [...] then i switched to linux and it segfault'd

Means you still don't run your compiler with proper warnings enabled, or you would have caught that problem long before it segfaults.

*to all those who replied to my post telling me that i need the pointer to point somewhere, re-read the post and notice how i was talking in the past.