9.29.2.1 Special Characters

The presence of a `!' or `/' on a line indicates the start of a comment that extends to the end of the current line.

If a `#' appears as the first character of a line then the whole line is treated as a comment, but in this case the line could also be a logical line number directive (see Comments) or a preprocessor control command (see Preprocessing).

The `;' character can be used to separate statements on the same line.