1
A comment starts with two adjacent hyphens and extends up to the end of the line.
2
comment::= −−{non_end_of_line_character}
3
A comment may appear on any line of a program.
4
The presence or absence of comments has no influence on whether a program is legal or illegal. Furthermore, comments do not influence the meaning of a program; their sole purpose is the enlightenment of the human reader.
5
Examples of comments:
6
−− the last sentence above echoes the Algol 68 report end; −− processing of Line is complete −− a long comment may be split onto −− two or more consecutive lines −−−−−−−−−−−−−−−− the first two hyphens start the comment