Comments - language feature

Example from C, C++, Tick C, Real-Time Concurrent C:

/* hello world */
// hi

Example from Python, Julia, Cython:

# This is a comment

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 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 Ruby:

# This is a single line comment.

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

-- A comment

Example from R, Bash, Crystal, Sage, GraphQL, Nginx, Smali, MIPS architecture, AMPL, Nearley, Makefile, TOML, Icon, Boo, SPARQL, AGC, API Blueprint, Perl 6, Embedded Crystal, LiveScript, YASnippet, PRQL, starlark, Dc, Golo, CWL, WDL, Ren'Py, Ragel, Java Properties, Reia, Unicon, Hjson, Expect, Dockerfile, mgmt, Filebench WML, LookML, Mu, Logica, GDScript, PIC, Tea, ArkScript, Praat Script, storyscript, Alpine Abuild, Vigil, Raku, Ezhil, spry, Pan, S-PLUS, NestedText, Rc, Gentoo Ebuild, BitBake, Parser 3, Parrot BASIC, Gherkin, Yet Another Scripting Language, Zimpl, C shell, Claro, Yedalog, BuddyScript, ldpl, tremor-query, rbs, Portable Bit Map Format, blz, Netpbm grayscale image format, Wart, 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 ARM, LLVM IR, Red, LFE, EuLisp, MUMPS, Emacs Lisp, x86 Assembly, Hy, CLIPS, NetLogo, Csound, wisp, Netwide Assembler, Augmented Backus-Naur Form, Fennel, datascript, Action!, carp, Guile, NCAR Command Language, KiXtart, Bel, CLOS, carth, Jasmin, GCC Machine Description, SMT, SRecode Template, lispyscript, Guix Workflow Language, MACRO-10, turnstile, PROMAL, neut, Fjölnir, z80, Project Mentat, Caché ObjectScript, taf, atomese, Reactive Plan Language, rosette-lang, ca65 Assembly, Plot, stella, wescheme, lain, Sweet Expressions:

; A comment

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

// A comment

Example from Elixir:

# this is a comment

Example from Erlang:

% hello world program

Example from CUDA, ActionScript, Jison, X10, PL/I, Nextflow, PostCSS, 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 XQuery:

(: Hello World with XQuery :)

Example from SPSS:

* A comment where first character must be *.

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

' A comment

Example from Rexx:

* => 1000000000 */

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

(* A comment
*)

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

% 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 SNOBOL, Refal, ActiveVFP:

* A comment

Example from Ini:

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

Example from Batchfile:

REM A 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 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 FML:

# This is a line comment

###
This is a block comment
###

Example from Quaint:

;; A comment

Example from RELAX NG:

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

Example from HAGGIS:

''' A comment
'''

Example from Orc:

{- A comment
-}

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 Mouse:

~ 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 popr:

__ A comment

Example from dedukti:

(; This is a comment ;)

Example from Lexon:

COMMENT A comment

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

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

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

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