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The presence of a `#' appearing anywhere on a line indicates the start of a comment that extends to the end of that 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 can also be a logical line number directive (see Comments) or a preprocessor control command (see Preprocessing).

If the --divide command line option has not been specified then the `/' character appearing anywhere on a line also introduces a line comment.

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