Comments in Programming Languages

01/03/2025

In programming, developers use comments to leave notes within the code. The syntax of comments varies between programming languages.

Language	Single Line Comment	Multiline Comment
C/C++	// C/C++ Single Line Comment	/* C/C++ Multiline Comments */
Java	// Java Single Line Comment	/* Java Multiline Comments */
Python	# Python Single Line Comment	“”” Python Multiline Comments “””
JavaScript	// JavaScript Single Line Comment	/* JavaScript Multiline Comments */
Ruby	# Ruby Single Line Comment	=begin Ruby Multiline Comments =end
PHP	// veya # PHP Single Line Comment	/* PHP Multiline Comments */
HTML	<– HTML Comment –>	<– HTML Comments –>
CSS	/* CSS Comment */	/* CSS Comments */
SQL	— SQL Single Line Comment	/* SQL Multiline Comments */
Bash/Shell	# Bash/Shell Single Line Comment	: ‘ Bash/Shell Multiline Comments ‘
Perl	# Perl Single Line Comment	=pod Perl Multiline Comments =cut
Swift	// Swift Single Line Comment	/* Swift Multiline Comments */
R	# R Single Line Comment	if (FALSE) { R Multiline Comments }
MATLAB	% MATLAB Single Line Comment	%{ MATLAB Multiline Comments %}
Kotlin	// Kotlin Single Line Comment	/* Kotlin Multiline Comments */
Go	// Go Single Line Comment	/* Go Multiline Comments */
Rust	// Rust Single Line Comment	/* Rust Multiline Comments */
Haskell	— Haskell Single Line Comment	{- Haskell Multiline Comments -}
TypeScript	// TypeScript Single Line Comment	/* TypeScript Multiline Comments */

Python Comments

# Python Single Line Comment

Python Multiline Comments

"""
Python Multiline
Comments
"""

C/C++ Comments

// C/C++ Single Line Comment

C/C++ Multiline Comments

/* 
   C/C++ Multiline
   Comments
*/

Java Comments

// Java Single Line Comment

Java Multiline Comments

/* 
   Java Multiline
   Comments
*/

Ruby Comments

# Ruby Single Line Comment

Ruby Multiline Comments

=begin
  Ruby Multiline 
  Comments
=end

PHP Comments

# PHP Single Line Comment

PHP Multiline Comments

/* 
   PHP Multiline 
   Comments
*/

HTML Comments

<!-- HTML Comments -->

CSS Comments

/* CSS Comments */

For detailed information about its usage, click on the CSS comment line.

JS Comments

// Javascript Single Comment Line

JS Multiline Comments

/* 
   JavaScript Multiline
   Commments
*/

SQL Comments

-- SQL Single Line Comment

SQL Multiline Comments

/* 
   SQL Multiline
   Comments
*/

Swift Comments

// Swift Single Comment Line

Swift Multiline Comments

/* 
   Swift Multiline
   Comments
*/

Kotlin Comments

// Kotlin Single Comment Line

Kotlin Multiline Comments

/* 
   Kotlin Multiline
   Comments
*/

Go Comments

// Go Single Line Comments

Go Multiline Comments

/* 
   Go Multiline
   Comments
*/

Rust Commets

// Rust Single Line Comments

Rust Multiline Comments

/* 
   Rust Multiline
   Comments
*/

Haskell Comments

-- Haskell Single Line Comments

Haskell Multiline Comments

{-
  Haskell Multiline 
  Comments
-}

TypeScript Comments

// TypeScript Single Line Comment

TypeScript Multiline Comments

/* 
   TypeScript Multiline
   Comments
*/

MATLAB Comments

% MATLAB Single Line Comment

MATLAB Multiline Comments

%{
  MATLAB Multiline
  Comments
%}

R Comments

# R Single Line Comments

R Multiline Comments

if (FALSE) {
  R Multiline
  Comments
}

Perl Comments

# Perl Single Line Comment

Perl Multiline Comments

=pod
  Perl Multiline
  Comments
=cut

Bash/Shell Comments

# Bash/Shell Single Line Comments

Bash/Shell Multiline Comments

: '
This is a 
multi-line comment
'

Software & Coding > Comments in Programming Languages