Comments and Compiler Directives

Comments are ignored by the compiler, except when they function as separators (delimiting adjacent tokens) or compiler directives.

There are several ways to construct comments:

  • Text between a left brace and a right brace constitutes a comment. }
  • Text between a left-parenthesis-plus-asterisk and an asterisk-plus-right-parenthesis is also a comment *)
  • Any text between a double-slash and the end of the line constitutes a comment.

Comments that are alike cannot be nested. For instance, {{}} will not work, but (*{}*) will. This is useful for commenting out sections of code that also contain comments.

A comment that contains a dollar sign ($) immediately after the opening { or (* is a compiler directive. For example,

{$WARNINGS OFF}

tells the compiler not to generate warning messages.

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