Access VBA:
' or REM
Commenting Code Access VBA, like all the VB-based languages, uses a single quote (' ) or the original class-style basic "REM " (most developers just use a quote). Access VBA does NOT have a multiple line comment.
Directives - #
Directives are sometimes called compiler or preprocessor directives. A # is used for directives within Access VBA code. Access VBA offers only an #If..then/#ElseIf/#Else directive.
Syntax Example: 'Single line comment. REM Old school single line comment. #If MyDirective Then '...some code. #End If
ASP Classic:
' or REM
Commenting Code ASP Classic, like all the VB-based languages, uses a single quote (' ) or the original class-style basic "REM " (most developers just use a quote). ASP Classic does NOT have a multiple line comment.
Preprocessor Directives - @ and # An @ is used for preprocessor directives within ASP code (within <% %> ) and a # is used for HTML-style preprocessor directives.
Note: ASP Classic does not support VB Classic's #If directive.
Syntax Example: 'Single line comment. REM Old school single line comment.
Common Preprocessor Directives include:
<%@LANGUAGE=VBScript%> <!-- #Include File="includes.inc" -->
C#:
"Multiple Line Comment" // or /* */
Commenting Code C# uses "//" for a single line comment and /* */ for a multiple line comment.
C++:
// or /* ... */
Commenting Code C++ uses "//" for a single line comment and /* */ for a multiple line comment.
Syntax Example:
//Single line comment in MS (not ANSI compliant so do NOT use). /* ANSI compliant single line comment. */ /* Multiple line comment. */ /* * This is another popular * way to write multi-line * comments. */
Corel Paradox:
; and { ... }
Commenting Code ObjectPAL uses ; for a single line comment and { } for a multiple line comment.
Delphi:
// or { ... } or (* ... *)
Commenting Code Delphi uses // for a single line comment and both {} and (**) for multiple line comments. Although you can nest different types of multiple line comments, it is recommended that you don't.
Compiler Directives - $ A special comment. Delphi compiler directives are in the form of {$DIRECTIVE}. Of interest for comments is using the $IFDEF compiler directive to remark out code.
Syntax Example: //This is a single line comment. { Multiple line comment. } (* This too is a multiple line comment. *) {$IFDEF TEMPOUT} //...code here {$ENDIF}
Delphi Prism:
// or { ... } or (* ... *)
Commenting Code Delphi uses // for a single line comment and both {} and (**) for multiple line comments. Although you can nest different types of multiple line comments, it is recommended that you don't.
Compiler Directives - $ A special comment. Delphi compiler directives are in the form of {$DIRECTIVE}. Of interest for comments is using the $IFDEF compiler directive to remark out code.
Syntax Example: //This is a single line comment. { Multiple line comment. } (* This too is a multiple line comment. *) {$IFDEF TEMPOUT} //...code here {$ENDIF}
Java:
// or /* ... */
Commenting Code Java uses "//" for a single line comment and /* */ for a multiple line comment.
Syntax Example:
//Single line comment in MS (not ANSI compliant so do NOT use). /* ANSI compliant single line comment. */ /* Multiple line comment. */ /* * This is another popular way * to write multi-line comments. */
JavaScript:
// or /* ... */
Commenting Code JavaScript uses "//" for a single line comment and /* */ for a multiple line comment.
Perl:
#
Commenting Code Perl uses # for single line comments and Perl does NOT have a multiple line comment.
Compiler Directives (A special comment.)
Perl also uses compiler directives embedded in comments with #! as in:
#!/usr/local/bin/perl -w
PHP:
# or // or /* ... */
Commenting Code Use the multi-line to comment out large blocks of code and to write multiple line comments.
Syntax Example:
#This is a comment in PHP. //This is too! /* This is a multi-line comment. */
VB Classic:
' or REM
Commenting Code VB Classic, like all the VB-based languages, uses a single quote (' ) or the original class-style basic "REM " (most developers just use a quote). VB Classic does NOT have a multiple line comment.
Directives - #
Directives are sometimes called compiler or preprocessor directives. A # is used for directives within VB Classic code. VB Classic offers only an #If..then/#ElseIf/#Else directive.
Syntax Example: 'Single line comment. REM Old school single line comment. #If MyDirective Then '...some code. #End If
VB.Net:
' or REM
Commenting Code VB.Net, like all the VB-based languages, uses a single quote (' ) or the original class-style basic "REM " (most developers just use a quote). VB.Net does NOT have a multiple line comment.
Syntax Example: 'Single line comment. REM Old school single line comment.