各种编程语言的注释符

常见语言：

c
行注释：none
块注释：
扩展名：.c/.h

c++
行注释：//这里是注释
块注释：
扩展名：.cpp/.h

c#
行注释：//这里是注释
块注释：
xml注释：///这里是xml注释
扩展名：.cs

vb
行注释：'这里是注释
块注释：none
扩展名：.bas

java
行注释：//这里是注释
块注释：
扩展名：.java

vb.net
行注释：'这里是注释
块注释：none
xml注释：///这里是xml注释
扩展名：.vb

perl
行注释：#这里是注释
块注释：none
扩展名：.pm

html
行注释：none
块注释：<!--这里是注释-->
扩展名：.htm/.html

SQL
行注释：--
块注释：

Comment comparison

There is a wide variety of syntax styles for declaring comments in source code.BlockCommentin italics is used here to indicate block comment style.InlineCommentin italics is used here to indicate inline comment style.

Language	In-line comment	Block comment
Ada,Eiffel,Euphoria,Occam,SPARK, ANSISQL,ToolBook OpenScript, andVHDL	--InlineComment
ALGOL 60		commentBlockComment;
ALGOL 68		¢BlockComment¢ commentBlockCommentcomment coBlockCommentco #BlockComment# £BlockComment£
AppleScript	--InlineComment	(*BlockComment*)
Assembly language(varies)	;InlineComment one example (most assembly languages use line comments only)
AutoHotkey	;InlineComment	/*BlockComment*/
AWK,Bash,Bourne shell,C shell,Maple,Python,R,Tcl, andWindows PowerShell	#InlineComment	<#BlockComment#>
BASIC(various dialects):	'InlineComment(not all dialects) REMInlineComment
C(K&R, ANSI/C89/C90),CHILL,PL/I, andREXX		/*BlockComment*/
C (C99),C++,Go, andJavaScript	//InlineComment	/*BlockComment*/
C#	//InlineComment ///InlineComment(XML documentation comment)	/*BlockComment*/ /**BlockComment*/(XML documentation comment)
Cobol	InlineComment(when * is in column 7)
Curl	||InlineComment	|#BlockComment#| |foo#BlockComment#|
Cobra	#InlineComment	/#BlockComment#/(nestable)
D	//InlineComment /// DocumentationInlineComment(ddoccomments)	/*BlockComment*/ /** DocumentationBlockComment*/(ddoccomments) /+BlockComment+/(nestable) /++ DocumentationBlockComment+/(nestable,ddoccomments)
DCL	$!InlineComment
ECMAScript(JavaScript,ActionScript, etc.)	//InlineComment	/*BlockComment*/
Forth	\InlineComment	(BlockComment)(single line only) (before--after)stack comment convention
FORTRAN66/77	CInlineComment(the letter 'C' in the first column makes the entire line a comment).
Fortran 90	!InlineComment(all characters on the line, from the exclamation mark onwards, are comments)
Haskell	--InlineComment	{-BlockComment-}
Java	//InlineComment	/*BlockComment*/ /**BlockComment*/(Javadocdocumentation comment)
LispandScheme	;InlineComment	#|BlockComment|#
Lua	--InlineComment	--[==[BlockComment]==](variable number of = signs)
Maple	#InlineComment	(*BlockComment*)
Mathematica		% (* BlockComment *)
Matlab	%InlineComment	%{ BlockComment (nestable) %} Note: Both percent–bracket symbols must be the only non-whitespace characters on their respective lines.
Object Pascal (Delphi)	//InlineComment	(*BlockComment*) {BlockComment}
OCaml		(*BlockComment (* nestable *)*)
Pascal,Modula-2,Modula-3,Oberon, andML:		(*BlockComment*)(OCaml comments are nestable)
PerlandRuby	#InlineComment	=begin BlockComment =cut(PODdocumentation comment) __END__ Comments after end of code
PHP	#InlineComment //InlineComment	/*BlockComment*/ /** DocumentationBlockComment*/(PHP Doc comments)
PILOT	R:InlineComment
PL/SQLandTSQL	--InlineComment	/*BlockComment*/
REALbasic	'InlineComment //InlineComment remInlineComment
SAS		*BlockComment; /*BlockComment*/
Seed7	#InlineComment	(*BlockComment*)
Simula		commentBlockComment; !BlockComment;
Smalltalk		"BlockComment"
Smarty		{*BlockComment*}
Standard ML		(*BlockComment*)
TeX,LaTeX,PostScript,Erlang, andS-Lang	%InlineComment
Texinfo	@cInlineComment @commentInlineComment
TUTOR	*InlineComment command$$InlineComment
Visual Basic	'InlineComment RemInlineComment
Visual Basic .NET	'InlineComment '''InlineComment(XML documentation comment) RemInlineComment
Visual Prolog	%InlineComment	/*BlockComment*/

参考推荐：

Comparison of programming languages (syntax) （wiki）