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The presence of a ; 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, 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).
The $ character can be used instead of a newline to separate statements. Note: the -mno-dollar-line-separator option disables this behaviour.