9.41.2.1 Special Characters

! ’ is the line comment character.

You can use ‘ ; ’ instead of a newline to separate statements.

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 ).

Since ‘ $ ’ has no special meaning, you may use it in symbol names.