Hi, I'm sorry. After your answer i realised that my message should be posted on a c/c++ mailing list not in this one.
Sorry again --- Eric Blake <[EMAIL PROTECTED]> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > According to community help on 10/20/2005 7:06 AM: > > Hi, > > > > I'm using g++ on cygwin for developping some c++ > > programs. > > > > I noticed that everytime i manipulate pointers i > have > > an error saying: > > "Segmentation Fault <Core Dumped>". > > Well, it's because you are trying to modify > read-only memory. Fix the bug > in your code. Your problem is not cygwin-specific, > although cygwin is a > little less forgiving of memory usage errors, and > more likely to core dump > when your code is buggy. > > > ---------------------- > > #include <iostream.h> > > #include <string.h> > > > > int main() > > { > > char * str; > > str = "hello"; > > The type of "hello" is const char*, because it lives > in read-only memory. > You are (silently) casting away the const, and that > is your bug; compile > with -Wall and you should be getting a warning. > > > *(str+1) = 'a'; > > Oops - now you are trying to change a read-only > location. > > Now, had you declared this instead: > char str[] = "hello"; > > Then *(str+1) = 'a' is legal, because C++ allows a > char[] initializer to > copy the contents of a string literal, without > putting it in read-only memory. > > - -- > Life is short - so eat dessert first! > > Eric Blake [EMAIL PROTECTED] > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.1 (Cygwin) > Comment: Public key at > home.comcast.net/~ericblake/eblake.gpg > Comment: Using GnuPG with Thunderbird - > http://enigmail.mozdev.org > > iD8DBQFDV5vv84KuGfSFAYARAg+yAJwIbqTkFDH5j9+a3Mmn2ON7KL8rwgCfTALA > v2bKNT8djHRvcVBHSSuFQ7g= > =/+gu > -----END PGP SIGNATURE----- > > -- > Unsubscribe info: > http://cygwin.com/ml/#unsubscribe-simple > Problem reports: > http://cygwin.com/problems.html > Documentation: http://cygwin.com/docs.html > FAQ: http://cygwin.com/faq/ > > __________________________________ Yahoo! Music Unlimited Access over 1 million songs. Try it free. http://music.yahoo.com/unlimited/ -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/