C99 explicitly does \-splicing of lines before comment processing: //\ this is a comment /\ / this is also a comment GCC has an option (-Wcomment, en

C99 explicitly does \-splicing of lines before comment processing: //\ this is a comment /\ / this is also a comment GCC has an option (-Wcomment, enabled by -Wall) to warn about this and other likely mistakes involving comments (e.g. nested /* */ comments).