This tip actually comes out of a "bug" that Blommis found a while back. If you want to create a string (or you can do this for comments too) that sits on more than one line, you can use a backslash at the end of the line to extend it to the next. For example:
#include <stdio.h>

// My Comment \
ends here
int main() {
    printf("I\
like\
to\
code\
weird");

    return 0;
}
Now that you have this knowledge, I don't really recommend you ever use it (especially for comments, since you can use /* */ for comments). But for really long strings, it might be useful.

For slightly more information on this, see here: http://forums.sdltutorials.com/viewtopic.php?f=18&t=67