int c3=076; <--- This is troublesome
int c4=098; <--- Ahhhh!!!!!! (actually throws a compiler error!)
I don't know why it always makes me crack up, but I love this comment in the 2nd edition of K&R:
Everyone's favorite trivial change: 8 and 9 are not octal digits
So pre-ANSI, your 098 might not have thrown an error, but I have no idea what it would do.