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. BlockComment in italics is used here to indicate block comment style. InlineComment in italics is used here to indicate inline comment style.

LanguageIn-line commentBlock commentAda, Eiffel, Euphoria, Occam, SPARK, ANSI SQL, ToolBook OpenScript, and VHDL-- InlineComment ALGOL 60 comment BlockComment;ALGOL 68 ¢ BlockComment ¢

comment BlockComment comment
co BlockComment co
# 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, and Windows PowerShell# InlineComment<# BlockComment #>BASIC (various dialects):'InlineComment (not all dialects)

REM InlineComment

 C (K&R, ANSI/C89/C90), CHILL, PL/I, and REXX /* BlockComment */C (C99), C++, Go, and JavaScript// InlineComment/* BlockComment */C#// InlineComment
/// InlineComment (XML documentation comment)/* BlockComment */
/** BlockComment */ (XML documentation comment)CobolInlineComment (when * is in column 7) Curl|| InlineComment|# BlockComment #|

|foo# BlockComment #|

Cobra# InlineComment/# BlockComment #/ (nestable)D// InlineComment
/// Documentation InlineComment (ddoc comments)/* BlockComment */
/** Documentation BlockComment */ (ddoc comments)

/+ BlockComment +/ (nestable)
/++ Documentation BlockComment +/ (nestable, ddoc comments)

DCL$! InlineComment ECMAScript (JavaScript, ActionScript, etc.)// InlineComment/* BlockComment */Forth\ InlineComment( BlockComment ) (single line only)

( before -- after ) stack comment convention

FORTRAN 66/77C InlineComment (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 */ (Javadoc documentation comment)

Lisp and Scheme; 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, and ML: (* BlockComment *) (OCaml comments are nestable)Perl and Ruby# InlineComment=begin
BlockComment
=cut (POD documentation comment)

__END__
Comments after end of code

PHP# InlineComment
// InlineComment/* BlockComment */
/** Documentation BlockComment */ (PHP Doc comments)PILOTR:InlineComment PL/SQL and TSQL-- InlineComment/* BlockComment */REALbasic' InlineComment
// InlineComment
rem InlineComment SAS * BlockComment;
/* BlockComment */Seed7# InlineComment(* BlockComment *)Simula comment BlockComment;
! BlockComment;Smalltalk "BlockComment"Smarty {* BlockComment *}Standard ML (* BlockComment *)TeX, LaTeX, PostScript, Erlang, and S-Lang% InlineComment Texinfo@c InlineComment

@comment InlineComment

 TUTOR* InlineComment
command $$ InlineComment Visual Basic' InlineComment
Rem InlineComment Visual Basic .NET' InlineComment

''' InlineComment (XML documentation comment)
Rem InlineComment

 Visual Prolog% InlineComment/* BlockComment */



参考推荐：

Comparison of programming languages (syntax)  （wiki）