Comment (computer programming): Difference between revisions

Revision as of 13:04, 11 January 2025

Revision as of 13:14, 11 January 2025

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====Curly brace languages====

Many of the [[curly brace language]]s such as C, C++ and their many derivatives delimit a line comment with {{code|//}} and a block comment with {{code|/*}} and {{code|*/}}. Originally, C lacked the line comment, but it was added in [[C99]]. Notable languages include: C, C++, [[C# (programming language)|C#]], [[Java (programming language)|Java]], [[Javascript]] and [[JavascriptSwift (programming language)|Swift]]. For example:

<syntaxhighlight lang="c">

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// TODO implement

}

</syntaxhighlight>

Some languages, including Swift, allow blocks to be nested while other do not, including C and C++. An example of nested blocks in Swift:

<syntaxhighlight lang="swift">

/* This is the start of the outer comment.

/* This is the nested comment. */

This is the end of the outer comment. */

</syntaxhighlight>

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</syntaxhighlight>

=====InBlock in Python=====

Although Python does not provide for block comments<ref name=triple>{{cite web |url=https://www.tutorialdocs.com/tutorial/python3/python3-basic-syntax.html |title=Python 3 Basic Syntax |access-date=25 February 2019 |quote=Triple quotes are treated as regular strings with the exception that they can span multiple lines. By regular strings I mean that if they are not assigned to a variable they will be immediately garbage collected as soon as that code executes. hence are not ignored by the interpreter in the same way that #a comment is. |archive-date=19 August 2021 |archive-url=https://web.archive.org/web/20210819164828/https://www.tutorialdocs.com/tutorial/python3/python3-basic-syntax.html |url-status=dead }}</ref> a bare [[string literal]] represented by a triple-quoted string is often used for this purpose.<ref>[https://twitter.com/gvanrossum/status/112670605505077248 "Python tip: You can use multi-line strings as multi-line comments"], 11 September 2011, Guido van Rossum</ref><ref name=triple/> In the examples below, the triple double-quoted strings act like comments, but are also treated as [[docstring]]s:

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MySQL also supports comments from the hash (#) character to the end of the line.

==== Swift ====

In [[Swift (programming language)|Swift]], line comments begin {{code|//}}. Block comments are delimited by {{code|/*}}(/*) and {{code|*/}}. For example:

<syntaxhighlight lang="swift">

// This is a comment.

/* This is also a comment

but is written over multiple lines. */

</syntaxhighlight>

Block comments can be nested. For example:

<syntaxhighlight lang="swift">

/* This is the start of the outer comment.

/* This is the nested comment. */

This is the end of the outer comment. */

</syntaxhighlight>

====XML and HTML====