Comments - language feature

# This is a comment

Example from C, C++, Tick C:

/* hello world */
// hi

Example from HTML:

Example from Perl:

# This is a comment in perl
=begin comment
This is all part of multiline comment.
You can use as many lines as you like
These comments will be ignored by the 
compiler until the next =cut is encountered.
=cut

Example from Ruby:

# This is a single line comment.

Example from MATLAB:

% This is a comment

Example from C#, Go:

// This is a comment

Example from Fortran:

C
C Lines that begin with 'C' (in the first or 'comment' column) are comments
C

Example from MySQL, Ada, PostgreSQL, Idris, PL/SQL, MoonScript, Terra, Frege, Agda, Dhall, Classroom Object Oriented Language, Pig Latin, unison, Transact-SQL, Aldor, zephyr-asdl, Literate Agda, omega, dex, Opal, VHDL-AMS, HiveQL, OCL, Grammatical Framework, manool, ISETL, Bla, Amazon Redshift, luau:

-- A comment

Example from R, Bash, Crystal, Sage, GraphQL, Smali, Nginx, MIPS architecture, AMPL, Nearley, TOML, Makefile, Icon, Boo, SPARQL, API Blueprint, AGC, Embedded Crystal, Perl 6, LiveScript, YASnippet, PRQL, starlark, Dc, Golo, CWL, WDL, Reia, Ragel, Ren'Py, Java Properties, Hjson, Unicon, Expect, mgmt, Dockerfile, Filebench WML, Mu, Logica, LookML, Praat Script, GDScript, ArkScript, Tea, PIC, storyscript, Alpine Abuild, Vigil, spry, Pan, Raku, Ezhil, NestedText, S-PLUS, Rc, BitBake, Gentoo Ebuild, Parser 3, Yet Another Scripting Language, Gherkin, Parrot BASIC, Zimpl, Claro, C shell, ldpl, Yedalog, BuddyScript, tremor-query, blz, Wart, rbs, Portable Bit Map Format, Netpbm grayscale image format, Robots.txt, ppm-format, SubX:

# A comment

Example from CSS:

/* This is a single-line comment */ p { color: red; }

Example from Rust:

// https://doc.rust-lang.org/reference/comments.html
// a comment

Example from Pascal, ADLIB, Extended Pascal:

{ This is a single line comment in pascal. But needs to be closed. }

Example from Haskell:

 -- a single line comment
 {- A multiline comment
    which can continue for many lines
 -}

Example from TypeScript, Objective-C, Solidity, Reason, Yacc, Groovy, OpenCL, Pug, ANTLR, CIL, V, Protocol Buffers, FLUX, BCPL, Hack, DOT, idyll, Fantom, Ballerina, Zephir, Flow, Vala, QML, Click, xBase, Ceylon, JSON5, Java Bytecode, SystemVerilog, HCL, SuperCollider, Bison, odin, POV-Ray SDL, Wren, Dafny, MiniD, ATS, eC, Alloy, PEG.js, Halide, Bicep, Modelica, Objective-J, Clipper, PowerBuilder, Less, AspectJ, XBase++, mlir, Croc, Cue, Eve, Koka, Ron, Argdown, CIL, OpenVera, Taichi, SIL, Objective C++, BETA, Cg, PAWN, Felix, IGOR Pro, P4, JAI, MQL5, Angelscript, Volt, LPC, Rust MIR, beads-lang, JADE, Concise Encoding, Yoix, NetLinx, DM, Linden Scripting Language, Mask, ShaderLab, SugarSS, Whiley, Not Quite C, FutureBASIC, Harbour, mun-lang, CartoCSS, SCSS, Game Maker Language, JSON with Comments, Slice, SimCode, OX, Script.NET, Cell, winxed, Spatial, Strips, MVEL, Flow9, Cycript, Not eXactly C, LoomScript, Type Language, Treelang, Cypher Query Language, Operational Control Language, Fable, Maya Embedded Language, Logos, tht, Vale, gentee, KRL, Q#, dslx, spiral, Rescript, neeilang, hilvl, NS Basic, Tuple space, flagship, Nymph, Jsonnet, CIR, Language Server Index Format, Ligo, ddfql, DAX, dlvm, PowerQuery M, Hocon, holyc, silk, Adventure Game Studio Script, owen-lang, epsilon, HuJSON, kai, CFScript, Sophia, Judoscript, Finite State Language, Soy, StruQL, verifpal, Heron, fizz, OEM, JSL, Lite-C, xxl, Action Code Script, Pnuts, ctalk-lang, OptimJ, sora, rbscript, cooC, Static Typescript:

// A comment

Example from ARM, LLVM IR, Red, LFE, EuLisp, x86 Assembly, MUMPS, Hy, Emacs Lisp, NetLogo, CLIPS, Csound, wisp, Netwide Assembler, Fennel, Augmented Backus-Naur Form, datascript, carp, Action!, Guile, NCAR Command Language, Bel, KiXtart, CLOS, carth, Jasmin, GCC Machine Description, SMT, SRecode Template, lispyscript, neut, Guix Workflow Language, MACRO-10, turnstile, PROMAL, Project Mentat, Fjölnir, z80, taf, Caché ObjectScript, Atomese, Reactive Plan Language, rosette-lang, stella, ca65 Assembly, Plot, wescheme, lain, Sweet Expressions:

; A comment

Example from Elixir:

# this is a comment

Example from Erlang:

% hello world program

Example from CUDA, ActionScript, Jison, X10, PostCSS, Nextflow, PL/I, Opa, Lex, B, XS, JFlex, DTrace, Closure Templates, SourcePawn, Xtend, PARI/GP, PL/M, blockml, ARexx, RenderScript, WebIDL, Edje Data Collection, CLIST, Arden syntax, Handel-C, Plus, Simple Actor Language System and Architecture, ProbeVue, bioscript, PL/I-FORMAC:

/* A comment
*/

Example from Dart:

// Hi
/* Assume address is not null. */

Example from BASIC:

REM This BASIC program shows the use of the PRINT and GOTO Statements.

Example from OCaml:

(* This is a single-line comment. *)
(* This is a
 * multi-line
 * comment.
 *)

Example from SPSS:

* A comment where first character must be *.

Example from XQuery:

(: Hello World with XQuery :)

Example from Visual Basic .NET, Monkey, WxBasic, QB64, Spin, ThinBasic, StarOffice Basic, Turbo Basic, PowerBASIC, Brightscript, Caché Basic, Creative Basic, XBLite, Xbasic:

' A comment

Example from Rexx:

* => 1000000000 */

Example from Tex, Turing, Mercury, Datalog, KaTeX, Eclipse Command Language, Mary, Charity:

% A comment

Example from Oberon, Isabelle, UrWeb, Bluespec, EBNF, Fortress, COMPONENT PASCAL:

(* A comment
*)

Example from HAML:

-# A comment

Example from Object Pascal:

(* This is a multi-line comments
 and it will span multiple lines. *)
{ This is a single line comment in pascal }

Example from Ini:

# a '#' or ';' character indicates
; a comment

Example from SNOBOL, Refal, ActiveVFP:

* A comment

Example from Batchfile:

REM A comment
:: Another type of comment

Example from TLA:

\* A comment

Example from C3:

// A comment
/* Another comment */

Example from S-algol, True BASIC, BLISS, Module Management System, Structured Query Reporter:

! A comment

Example from Wolfram Language:

(* A comment *)

Example from Speedie:

// comment

Example from Twig:

{# A comment
#}

Example from HOPE:

--- A comment

Example from Slope:

; I am a comment

Example from Jule:

// A comment
/* A comment */

Example from S3:

@ a comment @

Example from groff:

Test
\" comment
Test
Test
\# comment
Test

Example from Fibonacci:

(* query examples *)

Example from Quaint:

;; A comment

Example from FML:

# This is a line comment

###
This is a block comment
###

Example from RELAX NG:

# Comments start with a # and continue to the end of the line:

Example from Recfiles:

# Blah blah…
# Unlike some file formats, comments in recfiles must be complete lines. You cannot start a comment in the middle of a line.

Example from Orc:

{- A comment
-}

Example from HAGGIS:

''' A comment
'''

Example from Z:

-- A simple function, that is used inside the macro below.
defun ap x y
     ++ x
        y
defmacro : input
         z:string input
-- Example with print:
print : Hello, World!
        What's going on in here?

Example from Uniform eXchange Format:

# <This is a comment>

Example from Mouse:

~ A comment

Example from popr:

__ A comment

Example from dedukti:

(; This is a comment ;)

Example from Lexon:

COMMENT A comment

Languages with Comments include Java, JavaScript, Python, C, SQL, HTML, C++, XML, PHP, Perl, Ruby, MATLAB, C#, Fortran, MySQL, R, Go, COBOL, CSS, Swift, Scala, Ada, Rust, PostgreSQL, Kotlin, PowerShell, Pascal, Haskell, TypeScript, ARM, Lua, Julia, SAS, Clojure, Prolog, Bash, Objective-C, Mathematica, Elixir, Visual Basic, Erlang, CUDA, Scheme, Dart, Modula-2, Solidity, Tcl, ActionScript, VBA, Verilog, Reason, BASIC, Crystal, awk, Delphi, CoffeeScript, F#, YAML, Elm, Maple, Eiffel, OCaml, Modula-3, Racket, Yacc, Smalltalk, D, Sage, Groovy, GraphQL, Common Lisp, LaTeX, VHDL, APL, Smali, Nginx, OpenCL, LLVM IR, SPSS, Nim, XQuery, Visual Basic .NET, PostScript, Pug, Chapel, Red, WebAssembly, Haxe, Rexx, ANTLR, LFE, fish, PureBasic, Forth, MIPS architecture, Lasso, Applescript, VBScript, Oz, Idris, Tex, SVG, Oberon, CIL, V, ABAP, PureScript, Simula, Protocol Buffers, AMPL, PicoLisp, sed, Logo, FLUX, HAML, Processing, BCPL, Dylan, Hack, PL/SQL, REBOL, Nearley, MoonScript, Squirrel, DOT, Terra, idyll, Jison, Monkey, Fantom, Ballerina, BlitzBasic, Frege, Agda, EuLisp, ColdFusion, x86 Assembly, Zig, TOML, MUMPS, J, AutoIt, Hy, Lean, GNU Octave, NewLisp, Emacs Lisp, Zephir, Makefile, Flow, Nemerle, X10, Vala, Icon, Turing, Scilab, QML, PostCSS, Nextflow, Pony, Mercury, PL/I, Click, EDN, Io, xBase, Opa, IDL, Ceylon, JSON5, Boo, QBasic, Java Bytecode, SPARQL, NetLogo, Clean, SystemVerilog, CLIPS, Stata, HCL, Object Pascal, SuperCollider, Factor, Ini, Cython, Bison, API Blueprint, AGC, SNOBOL, odin, POV-Ray SDL, PL/pgSQL, ClojureScript, Wren, Pike, Batchfile, Isabelle, Dafny, TLA, MiniD, C3, ATS, S-algol, eC, Embedded Crystal, Dhall, Lex, Csound, B, Perl 6, Alloy, FoxPRO, GW-BASIC, Xojo, PEG.js, Halide, E, LiveScript, Bicep, Modelica, ECL, AutoHotkey, Objective-J, wisp, Clipper, M4, Datalog, Wolfram Language, Speedie, UrWeb, PowerBuilder, GAP, Gambas, Seed7, YASnippet, Twig, Less, Befunge, XS, PRQL, Cap'n Proto, starlark, Classroom Object Oriented Language, Oberon-2, JFlex, Pig Latin, KaTeX, unison, Transact-SQL, AspectJ, Genie, XBase++, FreeBASIC, SETL, Maxima, Netwide Assembler, Dc, Falcon, DTrace, Golo, mlir, Croc, Bluespec, LiveCode, PEG, Fennel, NSIS, Cue, Ion, WxBasic, Eve, JCL, Augmented Backus-Naur Form, K, Closure Templates, janet, CWL, WDL, SourcePawn, True BASIC, Sather, Koka, datascript, Reia, Ragel, Ron, Xtend, Argdown, CIL, Ren'Py, HLSL, Java Properties, Ring, Hjson, carp, PARI/GP, XSLT, EBNF, Unicon, High Level Assembly, Fortress, muPad, Mirah, Gosu, OpenVera, HOPE, Taichi, SIL, Objective C++, Expect, BETA, Action!, Cg, PAWN, GLSL, Futhark, Felix, PL/M, LilyPond, progsbase, mgmt, IGOR Pro, UNLAMBDA, Slope, Euphoria, QB64, P4, Jule, JAI, Guile, MQL5, NCAR Command Language, Angelscript, Volt, LPC, Dockerfile, Rust MIR, beads-lang, Filebench WML, Spin, Pizza, Bel, Cryptol, KiXtart, JADE, Concise Encoding, blockml, Mu, Yoix, LotusScript, Logica, NetLinx, S3, ThinBasic, BlitzMax, ooc, Neko, LookML, Aldor, Lily, Apex, Nit, Gettext Catalog, clay, DM, OpenSCAD, Linden Scripting Language, Praat Script, GDScript, ARexx, CLOS, Mask, Eclipse Command Language, ArkScript, ShaderLab, Tea, PIC, SugarSS, Whiley, Not Quite C, FutureBASIC, StarOffice Basic, Fancy, Harbour, carth, Joy, COMPONENT PASCAL, zephyr-asdl, mun-lang, Observable, CartoCSS, SCSS, Ch, Jasmin, RenderScript, Literate Agda, Refal, storyscript, WebIDL, Game Maker Language, JSON with Comments, Turbo Basic, Edje Data Collection, PowerBASIC, Slice, SimCode, omega, CLIST, OX, Alpine Abuild, BLISS, Vigil, Script.NET, GCC Machine Description, ActiveVFP, OpenEdge ABL, Shen, C2, spry, Cell, groff, Brightscript, winxed, Spatial, Pan, Strips, MVEL, Flow9, Cycript, Raku, SMT, Caché Basic, Ezhil, Logtalk, SRecode Template, Fibonacci, Not eXactly C, Mary, MAXScript, LoomScript, Creative Basic, Type Language, lispyscript, MOO, Treelang, dex, Opal, Arden syntax, NetRexx, Quaint, Cypher Query Language, Operational Control Language, VHDL-AMS, Fable, FML, Gerbil Scheme, Maya Embedded Language, Logos, Handel-C, Dale, neut, HiveQL, NestedText, tht, monte, Guix Workflow Language, S-PLUS, Lingo, Vale, gentee, MACRO-10, KRL, Q#, basic calculator, XBLite, Plus, Module Management System, turnstile, OCL, dslx, spiral, Xbasic, ACL2, Rc, BitBake, Gentoo Ebuild, PROMAL, Rescript, Simple Actor Language System and Architecture, Grammatical Framework, Parser 3, neeilang, hilvl, NS Basic, RELAX NG, JSLT, Mako, Yet Another Scripting Language, Frink, Tuple space, Redcode, Gherkin, flagship, Nymph, Recfiles, Jsonnet, CIR, Parrot BASIC, Orc, Language Server Index Format, Ligo, ddfql, HAGGIS, Z, DAX, dlvm, PowerQuery M, Ren, Hocon, holyc, silk, Uniform eXchange Format, txr, Zimpl, manool, Boron, Mouse, Claro, Adventure Game Studio Script, C shell, Charity, Pawn, owen-lang, epsilon, GraphQL Schema Definition Language, HuJSON, popr, kai, JS++, CFScript, ldpl, pointless, Sophia, Project Mentat, Judoscript, parasail, Finite State Language, Soy, StruQL, NESL, Augeas, dedukti, Fjölnir, z80, verifpal, Yedalog, Structured Query Reporter, Heron, taf, BuddyScript, fizz, OEM, JSL, Easytrieve, Lite-C, Caché ObjectScript, Atomese, Manchester syntax, FloScript, xxl, Reactive Plan Language, tremor-query, blz, rosette-lang, TAL, Wart, Action Code Script, wah, XPL0, ISETL, Boogie, rbs, Savi, Pnuts, Bla, False, Lexon, Portable Bit Map Format, CLPR, Urbiscript, YAMP, stella, ca65 Assembly, ctalk-lang, Rita, ProbeVue, Plot, Netpbm grayscale image format, RLaB, OptimJ, AmbientTalk, Robots.txt, ppm-format, Amazon Redshift, USD, wescheme, lain, luau, bioscript, sora, SubX, Spice, Sweet Expressions, PromQL, SNOBOL4, KonsolScript, SARL, Oracle Java, boa, Deesel, rbscript, Smithy, PacmanConf, PkgConfig, BABEL, Lighttpd configuration file, Tick C, bawk, cooC, S-Snobol, GAEA, ADLIB, Static Typescript, Extended Pascal, Modula-2+, PL/I-FORMAC, Progol

Languages without Comments include JSON, Regular Expressions, JSONiq, Tree Notation, Superjson, JCOF

This question asks: Does the language have a syntax and support for comments?

Read more about Comments on the web: 1. 2.

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