Prestwood IT: Comments (Cross Reference Coding Encyclopedia: Access VBA)

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Comments

Languages Focus

Commenting code generally has three purposes: to document your code, for psuedo coding prior to coding, and to embed compiler directives. Most languages support both a single line comment and a multiple line comment. Some languages also use comments to give instructions to the compiler or interpreter.

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

Access VBA Comments (' or REM)

Cross Reference Examples:

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" -->

ASP Classic Comments (' or REM)

C#: "Multiple Line Comment" // or /* */

Commenting Code
C# uses "//" for a single line comment and /* */ for a multiple line comment.

Syntax Example:

//Single line comment.

/*
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.

*/

C++/CLI: // or /* ... */

Commenting Code
Same as standard C++. 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.

Syntax Example: 1 certification question.

;Single line comment.
 
{

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 Comments (// or { ... } or (* ... *)) 2 certification questions.

Delphi Prism: // or { ... } or (* ... *)

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 Comments (// or { ... } or (* ... *)) 1 certification question.

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.

Syntax Example:

//This is a single line comment.
 
/*
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

Syntax Example:

#This is a comment in Perl.

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 Classic Comments (' or REM)

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.

VB.Net Comments (' or REM) 2 certification questions.