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The characters * and # are line comment characters; each start a comment at the beginning of a line, but only at the beginning of a line. A # prefixes a hexadecimal number if found elsewhere on a line. If a # appears at the start of a line the whole line is treated as a comment, but the line can also act as a logical line number directive (see Comments) or a preprocessor control command (see Preprocessing).
Two other characters, % and !, each start a comment anywhere on the line. Thus you cant use the modulus and not operators in expressions normally associated with these two characters.
A ; is a line separator, treated as a new-line, so separate instructions can be specified on a single line.