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Line Comments

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Example from Java, JavaScript, C, C++, PHP, C#, Go, Scala, Swift, Rust, Kotlin, TypeScript, Objective-C, Dart, Verilog, Solidity, Reason, Delphi, F#, Yacc, Groovy, D, OpenCL, Chapel, Haxe, Pug, ANTLR, Lasso, CIL, Protocol Buffers, V, BCPL, Processing, Dylan, Hack, FLUX, DOT, idyll, Rust MIR, Fantom, Squirrel, Ballerina, Nemerle, Zephir, Vala, Flow, QML, Scilab, Io, xBase, Click, Ceylon, Java Bytecode, JSON5, Clean, SystemVerilog, SuperCollider, Stata, Bison, HCL, POV-Ray SDL, Pike, Deno, odin, MiniD, Wren, ATS, C3, Dafny, Lex, eC, Xojo, Alloy, Modelica, PEG.js, halide, Clipper, Objective-J, Bicep, ECL, PowerBuilder, Less, AspectJ, XBase++, Falcon, Croc, Ion, mlir, CIL, Cue, Eve, Koka, Argdown, Ron, OpenVera, SIL, BETA, Cg, PAWN, IGOR Pro, Felix, P4, Taichi, JAI, LPC, MQL5, Jule, Angelscript, Pizza, beads-lang, Volt, JADE, Yoix, NetLinx, Concise Encoding, OpenSCAD, Apex, DM, Linden Scripting Language, ShaderLab, FutureBASIC, Mask, Harbour, Whiley, CartoCSS, SugarSS, Ch, Observable, 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, Frink, flagship, DAX, ddfql, Tuple space, neeilang, hilvl, PowerQuery M, holyc, CFScript, Nymph, Jsonnet, Language Server Index Format, Ligo, Adventure Game Studio Script, dlvm, epsilon, JS++, 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, Deesel, Tick C, cooC, Real-Time Concurrent C, Static Typescript:

// A comment

Example from Python, Perl, Ruby, R, PowerShell, Bash, Elixir, Julia, Tcl, awk, Crystal, CoffeeScript, Maple, YAML, Sage, GraphQL, Nginx, Smali, Nim, fish, MIPS architecture, AMPL, PicoLisp, Nearley, Makefile, TOML, Icon, Boo, SPARQL, Cython, AGC, API Blueprint, Perl 6, Embedded Crystal, E, LiveScript, M4, Seed7, GAP, YASnippet, PRQL, starlark, Dc, Golo, CWL, WDL, Ren'Py, Ragel, Java Properties, Reia, Ring, Unicon, Hjson, Expect, UNLAMBDA, Dockerfile, mgmt, Filebench WML, LookML, Mu, Logica, GDScript, PIC, Tea, ArkScript, Praat Script, storyscript, Alpine Abuild, Vigil, Raku, Ezhil, spry, Pan, FML, S-PLUS, NestedText, Rc, Gentoo Ebuild, BitBake, RELAX NG, Parser 3, Parrot BASIC, Gherkin, Recfiles, 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, YAMP, SubX, bawk:

# A comment

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

-- A comment

Example from MATLAB, Prolog, Erlang, LaTeX, PostScript, Oz, Tex, GNU Octave, Turing, Mercury, Datalog, KaTeX, Eclipse Command Language, Mary, Charity, CLPR, GAEA, Progol:

% A comment

Example from Fortran:

C A comment

Example from COBOL:

MOVE ABC to XYZ *> This is a comment.

Example from ARM, Clojure, Scheme, Racket, Common Lisp, LLVM IR, Red, LFE, PureBasic, Logo, REBOL, EuLisp, MUMPS, AutoIt, Emacs Lisp, x86 Assembly, Hy, CLIPS, NetLogo, Ini, Csound, AutoHotkey, wisp, Netwide Assembler, NSIS, Augmented Backus-Naur Form, Fennel, datascript, Action!, carp, Guile, NCAR Command Language, KiXtart, Bel, CLOS, carth, Jasmin, GCC Machine Description, SMT, SRecode Template, lispyscript, Gerbil Scheme, Guix Workflow Language, MACRO-10, turnstile, PROMAL, neut, Ren, Boron, 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 SAS, ABAP, SNOBOL, Refal, ActiveVFP:

* A comment

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

' A comment

Example from BASIC, Batchfile:

REM A comment

Example from APL:

⍝ A comment

Example from Forth:

\ A comment

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

! A comment

Example from HAML:

-# A comment

Example from J:

NB. A comment

Example from TLA:

\* A comment

Example from K:

/ A comment

Example from HOPE:

--- A comment

Example from High Level Assembly:

// comment

Example from Slope:

; I am a comment

Example from Quaint:

;; A comment

Example from Cyber:

-- Counts iterations.

Example from Mouse:

~ A comment

Example from GraphQL Schema Definition Language:

“”” A comment

Example from Uniform eXchange Format:

#<A comment>

Example from popr:

__ A comment

Example from Lexon:

COMMENT A comment

Languages with Line Comments include Java, JavaScript, C, Python, SQL, C++, PHP, Perl, MATLAB, C#, Fortran, Ruby, MySQL, R, Go, COBOL, Scala, Swift, Ada, PostgreSQL, Rust, Kotlin, PowerShell, ARM, Haskell, Lua, TypeScript, SAS, Prolog, Bash, Clojure, Objective-C, Elixir, Visual Basic, Erlang, Scheme, Julia, Dart, Tcl, VBA, ActionScript, Verilog, Solidity, Reason, BASIC, awk, Delphi, Crystal, CoffeeScript, F#, Maple, Elm, Eiffel, YAML, Yacc, Racket, Groovy, D, Sage, Common Lisp, GraphQL, VHDL, LaTeX, Nginx, APL, OpenCL, Smali, LLVM IR, Nim, PostScript, Visual Basic .NET, Chapel, Red, Haxe, Pug, WebAssembly, LFE, PureBasic, Forth, fish, ANTLR, MIPS architecture, Lasso, VBScript, Oz, CIL, Applescript, 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, Agda, EuLisp, 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, xBase, Click, Pony, Boo, QBasic, Ceylon, Java Bytecode, SPARQL, JSON5, Clean, SystemVerilog, SuperCollider, CLIPS, Stata, Cython, NetLogo, SNOBOL, Bison, HCL, AGC, PL/pgSQL, API Blueprint, POV-Ray SDL, Pike, Deno, odin, Ini, Batchfile, TLA, MiniD, Wren, ATS, C3, Dafny, ClojureScript, Csound, S-algol, Perl 6, Lex, eC, Xojo, FoxPRO, Alloy, Dhall, Embedded Crystal, E, LiveScript, Modelica, AutoHotkey, PEG.js, halide, Clipper, Objective-J, Bicep, ECL, M4, Datalog, wisp, PowerBuilder, Less, Seed7, GAP, Classroom Object Oriented Language, Pig Latin, YASnippet, PRQL, Transact-SQL, AspectJ, SETL, XBase++, KaTeX, starlark, Falcon, Netwide Assembler, Cap'n Proto, Dc, LiveCode, unison, PEG, Croc, NSIS, Golo, WxBasic, Ion, True BASIC, JCL, Augmented Backus-Naur Form, Fennel, mlir, Sather, K, CWL, SourcePawn, CIL, WDL, Cue, datascript, Ren'Py, Eve, Ragel, Java Properties, Reia, Koka, Argdown, HLSL, Ring, muPad, Ron, Unicon, HOPE, High Level Assembly, Gosu, OpenVera, SIL, GLSL, Hjson, Expect, BETA, Action!, carp, 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, Filebench WML, Spin, JADE, Bel, Yoix, ThinBasic, NetLinx, Concise Encoding, CLOS, Cryptol, LookML, Mu, Aldor, OpenSCAD, Apex, BlitzMax, DM, Logica, Gettext Catalog, Linden Scripting Language, GDScript, Eclipse Command Language, Nit, clay, PIC, Tea, ShaderLab, FutureBASIC, Mask, PowerBASIC, Turbo Basic, ArkScript, Harbour, StarOffice Basic, Whiley, zephyr-asdl, Praat Script, carth, CartoCSS, SugarSS, Ch, Jasmin, Literate Agda, Refal, Observable, Fancy, Game Maker Language, storyscript, Objective C++, Not Quite C, omega, OX, Alpine Abuild, Slice, mun-lang, BLISS, SimCode, Vigil, GCC Machine Description, ActiveVFP, JSON with Comments, Shen, Brightscript, MVEL, SCSS, Script.NET, Cell, Cycript, Raku, winxed, Caché Basic, Strips, SMT, Ezhil, spry, Pan, Not eXactly C, Mary, Spatial, SRecode Template, Creative Basic, LoomScript, Flow9, Type Language, Treelang, dex, Operational Control Language, VHDL-AMS, Fable, Opal, FML, Cypher Query Language, Quaint, Maya Embedded Language, Logos, XBLite, lispyscript, Gerbil Scheme, HiveQL, Guix Workflow Language, MACRO-10, Cyber, KRL, Q#, NS Basic, Module Management System, turnstile, S-PLUS, tht, 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, Frink, Gherkin, flagship, JSLT, DAX, Recfiles, ddfql, Tuple space, neeilang, hilvl, PowerQuery M, Ren, Yet Another Scripting Language, holyc, CFScript, Zimpl, Nymph, Jsonnet, Boron, Mouse, Language Server Index Format, Ligo, 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, 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, tremor-query, Heron, taf, atomese, Reactive Plan Language, FloScript, Action Code Script, ISETL, Boogie, rosette-lang, rbs, xxl, Pnuts, Bla, Lexon, Portable Bit Map Format, blz, ca65 Assembly, ctalk-lang, CLPR, Plot, Netpbm grayscale image format, wah, Wart, stella, Savi, OptimJ, AmbientTalk, Robots.txt, ppm-format, YAMP, Amazon Redshift, USD, wescheme, Rita, lain, luau, sora, SubX, Sweet Expressions, PromQL, boa, Spice, rbscript, Deesel, PacmanConf, PkgConfig, Lighttpd configuration file, Tick C, cooC, Real-Time Concurrent C, GAEA, bawk, Static Typescript, Progol

Languages without Line Comments include HTML, XML, JSON, CSS, Pascal, Mathematica, Modula-2, Regular Expressions, OCaml, Modula-3, Smalltalk, Markdown, XQuery, SPSS, Rexx, ML, SVG, Standard ML, OWL, Object Pascal, Wolfram Language, JSONiq, Superjson, Marp, ADLIB, Extended Pascal, Modula-2+

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