Code Turns to Gibberish

[rebirf]

Hi I've been using emacs for c++ and c. the problem I have is that
sometimes my code will just turn into random characters. If I try to
open the file in a text editor it just won't open but if I open it in
emacs it displays a bunch of @'s and ^, says "init" a lot. before it
would happen when I saved the program, closed it, and tried to reopen.
This time it happened when I was in the middle of writing the
code..any help?

Thanks.