 Line endings are generally not significant in C; however, line boundaries do have significance during the preprocessing phase.Comments may appear either between the delimiters codice_48 and codice_49, or (since C99) following codice_40 until the end of the line.Comments delimited by codice_48 and codice_49 do not nest, and these sequences of characters are not interpreted as comment delimiters if they appear inside string or character literals.