Line Comments - language feature

Example from Java, JavaScript, C, C++, PHP, C#, Go, Swift, Scala, Rust, Kotlin, TypeScript, Objective-C, Dart, Solidity, Verilog, Reason, Delphi, F#, Yacc, D, Groovy, OpenCL, Pug, Chapel, Haxe, ANTLR, Lasso, CIL, V, Protocol Buffers, FLUX, Processing, BCPL, Dylan, Hack, Squirrel, DOT, idyll, Fantom, Ballerina, Zephir, Flow, Nemerle, Vala, Scilab, QML, Click, Io, xBase, Ceylon, JSON5, Java Bytecode, Clean, SystemVerilog, Stata, HCL, SuperCollider, Bison, POV-Ray SDL, odin, Wren, Pike, Dafny, MiniD, ATS, C3, Lex, eC, Alloy, Xojo, PEG.js, Halide, Bicep, Modelica, ECL, Objective-J, Clipper, PowerBuilder, Less, AspectJ, XBase++, Falcon, mlir, Croc, Cue, Ion, Eve, Koka, Ron, CIL, Argdown, OpenVera, Taichi, SIL, Objective C++, BETA, Cg, PAWN, Felix, IGOR Pro, P4, Jule, JAI, MQL5, Angelscript, LPC, Volt, Rust MIR, beads-lang, Pizza, JADE, Concise Encoding, Yoix, NetLinx, Apex, DM, OpenSCAD, Linden Scripting Language, Mask, ShaderLab, SugarSS, Whiley, Not Quite C, FutureBASIC, Harbour, mun-lang, CartoCSS, Observable, SCSS, Ch, Game Maker Language, JSON with Comments, Slice, SimCode, OX, Script.NET, Cell, winxed, Spatial, Strips, MVEL, Cycript, Flow9, 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, Frink, flagship, Tuple space, Nymph, Jsonnet, Language Server Index Format, Ligo, ddfql, CIR, dlvm, PowerQuery M, DAX, Hocon, holyc, silk, Adventure Game Studio Script, owen-lang, epsilon, HuJSON, kai, JS++, CFScript, Sophia, Judoscript, Finite State Language, Soy, StruQL, verifpal, Heron, fizz, OEM, JSL, Lite-C, xxl, Action Code Script, Pnuts, ctalk-lang, OptimJ, sora, Oracle Java, Deesel, rbscript, Tick C, cooC, Static Typescript:

// A comment

Example from Python, Perl, Ruby, R, PowerShell, Julia, Bash, Elixir, Tcl, Crystal, awk, CoffeeScript, YAML, Maple, Sage, GraphQL, Smali, Nginx, Nim, fish, MIPS architecture, AMPL, PicoLisp, Nearley, TOML, Makefile, Icon, Boo, SPARQL, Cython, API Blueprint, AGC, Embedded Crystal, Perl 6, E, LiveScript, M4, GAP, Seed7, YASnippet, PRQL, starlark, Dc, Golo, CWL, WDL, Reia, Ragel, Ren'Py, Ring, Hjson, Java Properties, Unicon, Expect, mgmt, UNLAMBDA, Dockerfile, Filebench WML, Mu, Logica, LookML, Praat Script, GDScript, ArkScript, PIC, Tea, storyscript, Alpine Abuild, Vigil, spry, Pan, Raku, Ezhil, FML, NestedText, S-PLUS, Rc, BitBake, Gentoo Ebuild, Parser 3, RELAX NG, Yet Another Scripting Language, Gherkin, Recfiles, Parrot BASIC, Zimpl, Claro, C shell, ldpl, Yedalog, BuddyScript, tremor-query, blz, Wart, rbs, Portable Bit Map Format, YAMP, Netpbm grayscale image format, Robots.txt, ppm-format, SubX, bawk:

# A comment

Example from SQL, MySQL, Ada, PostgreSQL, Haskell, Lua, Elm, Eiffel, VHDL, Applescript, Idris, PureScript, PL/SQL, MoonScript, Terra, Frege, Agda, Dhall, Classroom Object Oriented Language, Pig Latin, unison, Transact-SQL, SETL, LiveCode, Sather, Euphoria, Aldor, zephyr-asdl, Literate Agda, omega, dex, Opal, VHDL-AMS, 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, x86 Assembly, MUMPS, AutoIt, Hy, Emacs Lisp, NetLogo, CLIPS, Ini, Csound, AutoHotkey, wisp, Netwide Assembler, Fennel, NSIS, Augmented Backus-Naur Form, datascript, carp, Action!, Guile, NCAR Command Language, Bel, KiXtart, CLOS, carth, Jasmin, GCC Machine Description, SMT, SRecode Template, lispyscript, Gerbil Scheme, neut, Guix Workflow Language, MACRO-10, turnstile, PROMAL, Ren, Boron, 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 SAS, ABAP, SNOBOL, Refal, ActiveVFP:

* A comment

Example from Visual Basic, VBA, Visual Basic .NET, VBScript, Monkey, WxBasic, QB64, Spin, ThinBasic, StarOffice Basic, Turbo Basic, PowerBASIC, 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 High Level Assembly:

// comment

Example from HOPE:

--- A comment

Example from Slope:

; I am a comment

Example from Quaint:

;; A comment

Example from Cyber:

-- Counts iterations.

Example from Uniform eXchange Format:

#<A comment>

Example from Mouse:

~ A comment

Example from GraphQL Schema Definition Language:

“”” A comment

Example from popr:

__ A comment

Example from Lexon:

COMMENT A comment

Languages with Line Comments include Java, JavaScript, Python, C, SQL, C++, PHP, Perl, Ruby, MATLAB, C#, Fortran, MySQL, R, Go, COBOL, Swift, Scala, Ada, Rust, PostgreSQL, Kotlin, PowerShell, Haskell, TypeScript, ARM, Lua, Julia, SAS, Clojure, Prolog, Bash, Objective-C, Elixir, Visual Basic, Erlang, Scheme, Dart, Solidity, Tcl, ActionScript, VBA, Verilog, Reason, BASIC, Crystal, awk, Delphi, CoffeeScript, F#, YAML, Elm, Maple, Eiffel, Racket, Yacc, D, Sage, Groovy, GraphQL, Common Lisp, LaTeX, VHDL, APL, Smali, Nginx, OpenCL, LLVM IR, Nim, Visual Basic .NET, PostScript, Pug, Chapel, Red, WebAssembly, Haxe, ANTLR, LFE, fish, PureBasic, Forth, MIPS architecture, Lasso, Applescript, VBScript, Idris, Oz, Tex, 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, Monkey, Fantom, J, Ballerina, BlitzBasic, Frege, Agda, EuLisp, x86 Assembly, Zig, TOML, MUMPS, AutoIt, Hy, Lean, GNU Octave, NewLisp, Emacs Lisp, Zephir, Makefile, Flow, Nemerle, X10, Vala, Icon, Turing, Scilab, QML, Pony, Mercury, Click, Io, xBase, Ceylon, JSON5, Boo, QBasic, Java Bytecode, SPARQL, NetLogo, Clean, SystemVerilog, CLIPS, Stata, HCL, SuperCollider, Ini, Cython, Bison, API Blueprint, AGC, SNOBOL, POV-Ray SDL, odin, PL/pgSQL, ClojureScript, Wren, Pike, Batchfile, Dafny, TLA, MiniD, ATS, C3, S-algol, Dhall, Lex, Embedded Crystal, eC, Csound, Perl 6, Alloy, FoxPRO, Xojo, PEG.js, Halide, E, LiveScript, Bicep, Modelica, ECL, AutoHotkey, Objective-J, Clipper, wisp, M4, Datalog, PowerBuilder, GAP, Seed7, YASnippet, Less, PRQL, Cap'n Proto, starlark, Classroom Object Oriented Language, KaTeX, Pig Latin, unison, Transact-SQL, AspectJ, XBase++, SETL, Netwide Assembler, Dc, Falcon, mlir, Golo, Croc, LiveCode, PEG, Fennel, NSIS, Cue, Ion, WxBasic, Eve, JCL, K, Augmented Backus-Naur Form, CWL, WDL, True BASIC, SourcePawn, Sather, Koka, datascript, Reia, Ragel, Ron, CIL, Argdown, Ren'Py, HLSL, Ring, Hjson, Java Properties, carp, Unicon, High Level Assembly, muPad, Gosu, OpenVera, HOPE, Taichi, SIL, Objective C++, Expect, BETA, Action!, Cg, GLSL, PAWN, Futhark, Felix, LilyPond, mgmt, progsbase, IGOR Pro, UNLAMBDA, Slope, Euphoria, QB64, P4, Jule, JAI, Guile, MQL5, NCAR Command Language, Angelscript, LPC, Volt, Dockerfile, Rust MIR, beads-lang, Filebench WML, Spin, Pizza, Bel, KiXtart, Cryptol, JADE, Concise Encoding, Yoix, Mu, Logica, NetLinx, ThinBasic, BlitzMax, LookML, Aldor, Apex, Nit, Gettext Catalog, DM, clay, OpenSCAD, Linden Scripting Language, Praat Script, GDScript, CLOS, Eclipse Command Language, Mask, ShaderLab, ArkScript, PIC, Tea, SugarSS, Whiley, Not Quite C, FutureBASIC, StarOffice Basic, Harbour, carth, Fancy, zephyr-asdl, mun-lang, CartoCSS, Observable, SCSS, Jasmin, Literate Agda, Ch, Refal, storyscript, Game Maker Language, Turbo Basic, JSON with Comments, PowerBASIC, Slice, SimCode, omega, OX, Alpine Abuild, Vigil, BLISS, Script.NET, GCC Machine Description, ActiveVFP, Shen, spry, Cell, Brightscript, winxed, Spatial, Pan, Strips, MVEL, Cycript, Raku, Flow9, SMT, Caché Basic, Aardvark, Ezhil, SRecode Template, Not eXactly C, Mary, LoomScript, Creative Basic, Type Language, Treelang, dex, lispyscript, Opal, Quaint, Cypher Query Language, Operational Control Language, VHDL-AMS, Fable, Cyber, FML, Gerbil Scheme, Maya Embedded Language, Logos, HiveQL, neut, NestedText, tht, Guix Workflow Language, S-PLUS, Vale, gentee, MACRO-10, KRL, Q#, XBLite, Module Management System, turnstile, OCL, dslx, spiral, Xbasic, Rc, BitBake, Gentoo Ebuild, PROMAL, Rescript, Grammatical Framework, Parser 3, neeilang, hilvl, NS Basic, RELAX NG, JSLT, Yet Another Scripting Language, Frink, Gherkin, flagship, Tuple space, Redcode, Nymph, Recfiles, Jsonnet, Language Server Index Format, Ligo, ddfql, CIR, Parrot BASIC, Z, dlvm, PowerQuery M, Ren, DAX, Hocon, holyc, silk, Uniform eXchange Format, 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, Fjölnir, z80, verifpal, Yedalog, Structured Query Reporter, Heron, taf, BuddyScript, fizz, OEM, JSL, Easytrieve, Lite-C, Caché ObjectScript, Atomese, FloScript, xxl, Reactive Plan Language, tremor-query, blz, rosette-lang, Wart, Action Code Script, wah, ISETL, Boogie, rbs, Savi, Pnuts, Bla, Lexon, Portable Bit Map Format, CLPR, YAMP, stella, ca65 Assembly, ctalk-lang, Rita, Plot, Netpbm grayscale image format, OptimJ, AmbientTalk, Robots.txt, ppm-format, Amazon Redshift, USD, wescheme, lain, luau, sora, SubX, Spice, Sweet Expressions, PromQL, Oracle Java, boa, Deesel, rbscript, PacmanConf, PkgConfig, Lighttpd configuration file, Tick C, bawk, cooC, GAEA, Static Typescript, Progol

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

This question asks: Does the language have line comments?

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