# โปรแกรมเฮลโลเวิลด์
โปรแกรมเฮลโลเวิลด์ เป็นโปรแกรมคอมพิวเตอร์พื้นฐานที่ทำการแสดงผลคำว่า "Hello, World!" บนอุปกรณ์แสดงผล ซึ่งเป็นหนึ่งในโปรแกรมที่ง่ายที่สุดเท่าที่จะเป็นไปได้ในการเขียนภาษาโปรแกรมต่าง ๆ และมักถูกใช้เป็นตัวอย่างที่ง่ายที่สุดในการแสดงวากยสัมพันธ์ของภาษาโปรแกรมหนึ่ง ๆ โดยมักจะเป็นโปรแกรมแรกที่ผู้เริ่มต้นเขียนโปรแกรมเขียนออกมา นอกจากนี้ โปรแกรมเฮลโลเวิลด์ ยังสามารถใช้เพื่อตรวจสอบเบื้องต้นได้ว่า เครื่องมือของภาษาโปรแกรมถูกติดตั้งอย่างสมบูรณ์หรือไม่

 ประวัติ 
โปรแกรมเฮลโลเวิลด์โปรแกรมแรกเกิดขึ้น จากหนังสือการเขียนโปรแกรมภาษาซี แต่งโดยไบรอัน เคอร์นิงแฮน และ เดนนิส ริตชี ตีพิมพ์ในปี พ.ศ. 2521 (ค.ศ. 1978) โดยตัวอย่างโปรแกรมมาจาก กระดาษจดข้อมูลของไบรอันขณะที่ทำงานที่ เบลล์แล็บ (Bell Laboratories) ปี พ.ศ. 2517 (ค.ศ. 1974) ตัวอย่างในหนังสือ พิมพ์ข้อความว่า "hello, world" (โดยไม่ใช้ตัวพิมพ์ใหญ่และเครื่องหมายตกใจ ซึ่งได้ถูกเพิ่มมาในภายหลัง) 

main {
        printf("hello, world\n");
}

การเขียนคำนี้ มีการใช้งานโดยเขียนหลายแบบคือ ตัวอักษร H ใหญ่ และ h เล็ก ขณะเดียวกับ W ใหญ่ และ w เล็ก รวมถึงการเขียนเครื่องหมาย และแบบไม่มีเครื่องหมาย

การเขียนชุดคำสั่งนี้ในขณะที่บางโปรแกรมสามารถใช้คำสั่งได้อย่างเรียบง่าย ในขณะที่บางโปรแกรมต้องใช้คำสั่งซับซ้อนในการแสดงผล โดยเฉพาะอย่างยิ่งที่ใช้ GUI โปรแกรมเฮลโลเวิลด์มีประโยชน์ในการทดสอบว่าคอมไพเลอร์และส่วนต่างๆหลักของโปรแกรมทำงานได้ การรวบรวมคำสั่ง "hello world" ในภาษาโปรแกรมต่าง ๆ ถูกใช้ในการช่วยเรียน และการเปรียบเทียบการใช้งานของภาษาต่างๆ 
 ตัวอย่างของ Hello world ในภาษาโปรแกรมต่าง ๆ 
 4GL - Computer Associates with Ingres/DB 

 message "Hello, World!" with style = popup;

 ABAP - SAP AG 

 REPORT ZELLO.
 WRITE 'Hello, World!'.

 ABC 

 WRITE "Hello, world!"

 Ada 

 with Ada.Text_IO;
 
 procedure Hello is
 begin
    Ada.Text_IO.Put_Line ("Hello, world!") ;
 end Hello;

For explanation see wikibooks:Ada Programming:Basic.

 ALGOL 68 

In the popular upper-case stropping convention for bold words:

 BEGIN
     print (("Hello, World!", newline))
 END

or using prime stropping suitable for punch cards:

 'BEGIN'
     PRINT (("HELLO, WORLD!", NEWLINE))
 'END'

or minimally using the short form of begin and end, and implied newline at program termination:

 (print ("Hello, World!"))

 AmigaE 

 PROC main 
    WriteF ('Hello, World!') ;
 ENDPROC

 APL 

 'Hello World'

 AppleScript 
See also GUI section.

 return "Hello World!"

 ASP 

 <%
 Response.Write ("Hello World")
 %>

or simply:

 <%="Hello World" %>

 ASP.NET 

 Response.Write ("Hello World")

 Assembly language 

 Accumulator-only architecture: DEC PDP-8, PAL-III assembler 
See the example section of the PDP-8 article.

 First successful µP/OS combinations: Intel 8080/Zilog Z80, CP/M, RMAC assembler 

 bdos    equ    0005H    ; BDOS entry point
 start:  mvi    c,9      ; BDOS function: output string
         lxi    d,msg$   ; address of msg
         call   bdos
         ret             ; return to CCP
 
 msg$:   db    'Hello, world!$'
 end     start

 Accumulator + index register machine: MOS Technology 6502, CBM KERNAL, ca65 assembler 

 MSG:   .ASCIIZ "Hello, world!"
         LDX    #$F3
 @LP:    LDA    MSG-$F3,X ; load character
         JSR    $FFD2     ; CHROUT (KERNAL) , output to current output device (screen)
         INX
         BNE    @LP       ; 
         RTS

 Accumulator/Index microcoded machine: Data General Nova, RDOS 
See the example section of the Nova article.
 Expanded accumulator machine: Intel x86, DOS, TASM 

 MODEL   SMALL
 IDEAL
 STACK   100H
 
 DATASEG
         MSG DB 'Hello, world!', 13, '$'
 
 CODESEG
 Start:
         MOV AX, @data
         MOV DS, AX
         MOV DX, OFFSET MSG
         MOV AH, 09H      ; DOS: output ASCII$ string
         INT 21H
         MOV AX, 4C00H
         INT 21H
         END Start

 Expanded accumulator machine: Intel x86, Microsoft Windows, FASM 
Assumes that enviromnent variable %fasminc% is set
 format PE GUI 4.0
 include '%fasminc%\win32a.inc'
 section '.code' code readable executable
 invoke MessageBox,0,hellomsg,hellolb,MB_OK+MB_ICONINFORMATION
 invoke ExitProcess,0
 section '.data' data readable writable
 hellomsg db 'Hello, World!',0
 hellolb db 'Hello World',0
 data import
 library user32,'user32.dll',kernel32,'kernel32.dll'
 include '%fasminc%\apia\user32.inc'
 include '%fasminc%\apia\kernel32.inc'
 end data

 Expanded accumulator machine: Intel x86, Linux, GAS 

 .data
 msg:
     .ascii     "Hello, world!\n"
     len = . - msg
 .text
     .global _start
 _start:
     movl	$len,%edx
     movl	$msg,%ecx
     movl	$1,%ebx
     movl	$4,%eax
     int	$0x80
     movl	$0,%ebx
     movl	$1,%eax
     int	$0x80

 General-purpose fictional computer: MIX, MIXAL 

 TERM    EQU    19          console device no. (19 = typewriter)
         ORIG   1000        start address
 START   OUT    MSG (TERM)   output data at address MSG
         HLT                halt execution
 MSG     ALF    "HELLO"
         ALF    " WORL"
         ALF    "D    "
         END    START       end of program

 General-purpose fictional computer: MMIX, MMIXAL 
string BYTE "Hello, world!",#a,0 string to be printed (#a is newline and 0 terminates the string)
   Main  GETA   $255,string            get the address of the string in register 255
         TRAP   0,Fputs,StdOut         put the string pointed to by register 255 to file StdOut
         TRAP   0,Halt,0               end process

 General-purpose-register CISC: DEC PDP-11, RT-11, MACRO-11 

 .MCALL  .REGDEF,.TTYOUT,.EXIT
         .REGDEF
 
 HELLO:  MOV    #MSG,R1
         MOVB   (R1) ,R0
 LOOP:  .TTYOUT
         MOVB  + (R1) ,R0
         BNE    LOOP
        .EXIT
 
 MSG:   .ASCIZ  /HELLO, WORLD!/
        .END    HELLO

 CISC on advanced multiprocessing OS: DEC VAX, VMS, MACRO-32 
.title hello
 
         .psect    data, wrt, noexe
 
 chan:   .blkw     1
 iosb:   .blkq     1
 term:   .ascid    "SYS$OUTPUT"
 msg:    .ascii    "Hello, world!"
 len =   . - msg
 
         .psect    code, nowrt, exe
 
         .entry    hello, ^m<>
 
         ; Establish a channel for terminal I/O
         $assign_s devnam=term, -
                   chan=chan
         blbc      r0, end
 
         ; Queue the I/O request
         $qiow_s   chan=chan, -
                   func=#io$_writevblk, -
                   iosb=iosb, -
                   p1=msg, -
                   p2=#len
 
         ; Check the status and the IOSB status
         blbc      r0, end
         movzwl    iosb, r0
 
         ; Return to operating system
 end:    ret
 
        .end       hello

 RISC processor: ARM, RISC OS, BBC BASIC's in-line assembler 

 .program         
          ADR R0,message
          SWI "OS_Write0"
          SWI "OS_Exit"
 .message         
          DCS "Hello, world!"
          DCB 0
           ALIGN

หรือเวอร์ชันย่อ (จาก qUE) ;

          SWI"OS_WriteS":EQUS"Hello, world!":EQUB0:ALIGN:MOVPC,R14

 AutoHotkey 
MsgBox, "Hello, World!"

 Autoit 
MsgBox (1,'','Hello, world!') 

 AWK 

 BEGIN { print "Hello, world!" }

 Bash 

 echo Hello,\ world!

 BASIC 

 General 

The following example works for any ANSI/ISO-compliant BASIC implementation, as well as most implementations built into or distributed with microcomputers in the 1970s and 1980s (usually some variant of Microsoft BASIC) :

 10 PRINT "Hello, world!"
 20 END

Such implementations of BASIC could also execute instructions in an immediate mode when line numbers are omitted. The following examples work without requiring a RUN instruction.

 PRINT "Hello, world!"
 ? "Hello, world!"

Later implementations of BASIC allowed greater support for structured programming and did not require line numbers for source code. The following example works when RUN for the vast majority of modern BASICs.

 PRINT "Hello, world!"
 END

Again, the "END" statement is optional in many BASICs.

 PBASIC 

 DEBUG "Hello, world!", CR

or, the typical microcontroller Hello World program equivalent with the only output device present being a light-emitting diode (LED) (in this case attached to the seventh output pin) :

 DO
     HIGH 7 'Make the 7th pin go high (turn the LED on)
     PAUSE 500 'Sleep for half a second
     LOW 7 ' Make the 7th pin go low (turn the LED off)
     PAUSE 500 'Sleep for half a second
 LOOP
 END

 StarOffice/OpenOffice Basic 
 sub main
     print "Hello, World"
 end sub

 TI-BASIC 

On TI calculators of the TI-80 through TI-86 range:

 :Disp "HELLO, WORLD!"           or
 :Output (x,y,"HELLO, WORLD!")    or
 :Text (x,y,"HELLO, WORLD!")      or
 :Text (-1,x,y,"HELLO, WORLD!")   ;only on the 83+ and higher

or simply
 :"HELLO, WORLD!"

On TI-89/TI-92 (+) /Voyage 200 calculators:

 :hellowld 
 :Prgm
 :Disp "Hello, world!"
 :EndPrgm

 Visual Basic 

 Sub Main
   MsgBox "Hello World!"
 End Sub

 Visual Basic .NET 

 Module HelloWorldApp
   Sub Main 
      System.Console.WriteLine ("Hello, world!")
   End Sub
 End Module

or, defined differently,

 Class HelloWorldApp
   Shared Sub Main 
      System.Console.WriteLine ("Hello, world!")
   End Sub
 End Class

 Blitz BASIC 
Print "Hello, World!"

 DarkBASIC 
PRINT "HELLO WORLD"
 TEXT 0,0,"Hello World"
 WAIT KEY

 BCPL 
GET "LIBHDR"
 
 LET START  BE
 $ (
     WRITES ("Hello, world!*N")
 $)

 BLISS 

 %TITLE 'HELLO_WORLD'
 MODULE HELLO_WORLD (IDENT='V1.0', MAIN=HELLO_WORLD,
         ADDRESSING_MODE (EXTERNAL=GENERAL)) =
 BEGIN
 
     LIBRARY 'SYS$LIBRARY:STARLET';
 
     EXTERNAL ROUTINE
        LIB$PUT_OUTPUT;
 
 GLOBAL ROUTINE HELLO_WORLD =
 BEGIN
 
     LIB$PUT_OUTPUT (%ASCID %STRING ('Hello World!'))
 END;
 
 END
 ELUDOM

 boo 
See also GUI Section.

 print "Hello, world!"

 Casio FX-9750 
This program will work on the fx-9750 graphing calculator and compatibles.

 "HELLO WORLD"↵

 C 
 #include <stdio.h>
 
 int main
 {
    printf("Hello, world!");
    return 0;
 }

 Ch 

The above C code can run in Ch as examples. The simple one in Ch is:

  printf ("Hello, world\n") ;

 C# 
See also GUI Section.
 
 class HelloWorldApp
 {
     static void Main 
     {
         System.Console.WriteLine ("Hello, world!") ;
     }
 }

 C++ 

 #include <iostream>
 using namespace std;
 
 int main 
 {
     cout << "Hello, world!\n";
 }

 C++/CLI 

 int main 
 {
    System::Console::WriteLine ("Hello, world!") ;
 }

 C++, Managed (.NET) 

 #using <mscorlib.dll>
 
 using namespace System;
 
 int wmain 
 {
     Console::WriteLine ("Hello, world!") ;
 }

 ColdFusion (CFM) 

 Hello, world!

 COMAL 

 PRINT "Hello, World!"

 CIL 

 .method public static void Main  cil managed
 {
      .entrypoint
      .maxstack 8
      ldstr "Hello, world!"
      call void [mscorlib]System.Console::WriteLine (string)
      ret
 }

 Clean 

 module hello
 
 Start = "Hello, world"

 CLIST 

 PROC 0
 WRITE Hello, World!

 Clipper 

 @1,1 say "Hello World!"

 COBOL 

 IDENTIFICATION DIVISION.
 PROGRAM-ID.     HELLO-WORLD.
 
 ENVIRONMENT DIVISION.
 
 DATA DIVISION.
 
 PROCEDURE DIVISION.
 DISPLAY "Hello, world!".
 STOP RUN.

 D 

 import std.stdio;
 void main 
 {
     writefln ("Hello, world!") ;
 }

 DC an arbitrary precision calculator 

 [Hello, world!]p

 DCL batch 

 $ write sys$output "Hello, world!"

 DOLL 

 // The program is itself an object. The program "this" object can be overloaded
 // as a function that work as "main" function in a C program.
 this 
 {
     system.stdout ("Hello, World!") ;
 }

 Dylan 

 module: hello
 
 format-out ("Hello, world!\n") ;

 Ed and Ex (Ed extended) 

 a
 hello world!
 .
 p

 Eiffel 

 class HELLO_WORLD
 
 creation
     make
 feature
     make is
     local
             io:BASIC_IO
     do
             !!io
             io.put_string ("%N Hello, world!")
     end -- make
 end -- class HELLO_WORLD

 Erlang 

 -module (hello).
 -export ([hello_world/0]).
 
 hello_world  -> io:fwrite ("Hello, world!\n").

 Euphoria 

 puts (1, "Hello, world!")

 F# 

 print_endline "Hello world"

 Factor 

 "Hello world" print

 filePro 

 @once
    mesgbox "Hello, world!"
    exit

 Fjölnir 

 "hello" < main
 {
    main ->
    stef (;)
    stofn
        skrifastreng (;"Halló Veröld!") ,
    stofnlok
 }
 *
 "GRUNNUR"
 ;

 FOCAL 

 type "Hello, World!",!
or
 t "Hello, World!",!

 Focus 

 -TYPE Hello World

 Forte TOOL 

 begin TOOL HelloWorld;
 
 includes Framework;
 HAS PROPERTY IsLibrary = FALSE;
 
 forward  Hello;
 
 -- START CLASS DEFINITIONS
 
 class Hello inherits from Framework.Object
 
 has public  method Init;
 
 has property
     shared= (allow=off, override=on) ;
     transactional= (allow=off, override=on) ;
     monitored= (allow=off, override=on) ;
     distributed= (allow=off, override=on) ;
 
 end class;
 -- END CLASS DEFINITIONS
 
 -- START METHOD DEFINITIONS
 
 ------------------------------------------------------------
 method Hello.Init
 begin
 super.Init  ;
 
 task.Part.LogMgr.PutLine ('HelloWorld!') ;
 end method;
 -- END METHOD DEFINITIONS
 HAS PROPERTY
     CompatibilityLevel = 0;
     ProjectType = APPLICATION;
     Restricted = FALSE;
     MultiThreaded = TRUE;
     Internal = FALSE;
     LibraryName = 'hellowor';
     StartingMethod = (class = Hello, method = Init) ;
 
 end HelloWorld;

 Forth 

 : halloforth (--) ." Hello, world!" CR ;

 FORTRAN 

    PROGRAM HELLO
      PRINT *, 'Hello, world!'
    END

 Fril 

  ? ((pp "Hello, world!"))

 Frink 

 println["Hello, world!"]

 Gambas 
See also GUI section.

 PUBLIC SUB Main 
   Print "Hello, world!"
 END

 Game Maker 
In the draw event of some object:

 draw_text (x,y,"Hello World")

Or to show a splash screen message:

 show_message ("Hello World")

 Haskell 

 module Main (main) where
 
 main = putStrLn "Hello World"
or
 main = putStrLn "Hello World"

 Heron 

 program HelloWorld;
 functions {
   _main  {
     print_string ("Hello, world!") ;
   }
 }
 end

 HP-41 & HP-42S 
(Handheld Hewlett-Packard RPN-based alphanumeric engineering calculators.)
 
 01 LBLTHELLO
 
 02 THELLO, WORLD
 
 03 PROMPT

HP-41 output

 HyperTalk (Apple HyperCard's scripting programming language) 

 put "Hello world"
or

Answer "Hello World"

 IDL 

 print,"Hello world!"

 Inform 

 [ Main;
   print "Hello, world!^";
 ];

 Io 

 "Hello world!" print

or

 write ("Hello world!\n")

 Iptscrae 

 ON ENTER {
     "Hello, " "World!" & SAY
 }

 J 
Simplest:
  Hello World

Probably closest in semantics:
 'Hello World'

 Jal 
include 16f877_20
  include hd447804
  
  hd44780_clear
  
  hd44780 = "H"
  hd44780 = "e"
  hd44780 = "l"
  hd44780 = "l"
  hd44780 = "o"
  hd44780 = " "
  hd44780 = "W"
  hd44780 = "o"
  hd44780 = "r"
  hd44780 = "l"
  hd44780 = "d"
  hd44780 = "!"

 Java 
See also GUI section.

 public class Work_name_or_tag
 {
     public static void main (String[] args) 
     {
         System.out.println ("Hello, world!") ;
     }
 }

 Java byte-code 
(disassembler output of javap -c Hello.class)

 public class Hello extends java.lang.Object {
     public Hello  ;
     public static void main (java.lang.String[]) ;
 }
 
 Method Hello 
    0 aload_0
    1 invokespecial #1 <Method java.lang.Object  >
    4 return
 
 Method void main (java.lang.String[])
    0 getstatic #2 <Field java.io.PrintStream out>
    3 ldc #3 <String "Hello, world!">
    5 invokevirtual #4 <Method void println (java.lang.String) >
    8 return

 K 

 `0:"Hello world\n"

 Kogut 

 WriteLine "Hello, world!"

 Lisp 

Lisp has many dialects that have appeared over its almost fifty-year history.

 Common Lisp 

 (format t "Hello world!~%")

or

 (write-line "Hello World!")

or merely:

  "Hello World!"

 Scheme 

 (display "Hello, world!")
 (newline)

 Emacs Lisp 

  (print "Hello World")

 Logo 

 print [hello  world!]
or
 pr [Hello World!]

In mswlogo only

 messagebox [Hi] [Hello World]

 Lua 

 print "Hello, world!"

 LuaPSP 

 screen:print (1,1,"Hello, world!")
 screen:flip 

 M (MUMPS) 

 W "Hello, world!"

 Macsyma, Maxima 

 print ("Hello, world!") $

 Maple 

 print ("Hello, World!") ;

 Mathematica 

 Print["Hello World"]

 MATLAB 

 disp ('Hello World')

 Max 

 max v2;
 #N vpatcher 10 59 610 459;
 #P message 33 93 63 196617 Hello world!;
 #P newex 33 73 45 196617 loadbang;
 #P newex 33 111 31 196617 print;
 #P connect 1 0 2 0;
 #P connect 2 0 0 0;
 #P pop;

 Modula-2 

 MODULE Hello;
 
 FROM Terminal2 IMPORT WriteLn; WriteString;
 
 BEGIN
    WriteString ("Hello, world!") ;
    WriteLn;
 END Hello;

 MOO 

 notify (player, "Hello, world!") ;

 MS-DOS batch 
 (with the standard command.com interpreter. The @ symbol is optional and prevents the system from repeating the command before executing it. The @ symbol must be omitted on versions of MS-DOS prior to 3.0.) 

 @echo Hello, world!

 MUF 

 : main
   me @ "Hello, world!" notify
 ;

 Natural 
 WRITE "Hello, World!"
 END

 Nemerle 
The easiest way to get Nemerle print "Hello, world!" would be that:

 System.Console.WriteLine ("Hello, world!") ;

however, in bigger applications the following code would be probably more useful:

 using System.Console;
 
 module HelloWorld
 {
    Main  :void
    {
       WriteLine ("Hello, world!") ;
    }
 }

 Oberon 
Oberon is both the name of a programming language and an operating system.

Program written for the Oberon operating system:

 MODULE Hello;
         IMPORT Oberon, Texts;
  VAR W: Texts.Writer;
 
  PROCEDURE World*;
  BEGIN
    Texts.WriteString (W, "Hello World!") ;
    Texts.WriteLn (W) ;
    Texts.Append (Oberon.Log, W.buf)
  END World;
 
 BEGIN
  Texts.OpenWriter (W)
 END Hello.

Freestanding Oberon program using the standard Oakwood library:

 MODULE Hello;
    IMPORT Out;
 BEGIN
    Out.String ("Hello World!") ;
    Out.Ln
 END Hello.

 Objective C 
 Functional C Version 
 #import <stdio.h>
 
 int main  {
     printf ("Hello, World!\n") ;
     return 0;
 }

 Object-Oriented C Version 
 import <stdio.h>
 
 //An object-oriented version.
 @interface Hello : Object
 {
    const char str[] = "Hello world";
 }
 - (id) hello (void) ;
 @end
 
 @implementation Hello
 - (id) hello (void)
 {
    printf ("%s\n", str) ;
 }
 @end
 
 int main (void)
 {
    Hello *h = [Hello new];
    [h hello];
    
    [h free];
    return 0;
 }

 OPENSTEP/Cocoa Version 
 import <Foundation/Foundation.h>
 
 int main (int argc, const char * argv[])
 {
    NSLog (@"Hello, World!") ;
    return 0;
 }

 OCaml 

 print_endline "Hello world!"

 OPL 
See also GUI section.

 PROC hello:
   PRINT "Hello, World"
 ENDP

 OPS5 

 (object-class request
          ^action)
 
 (startup
    (strategy MEA)
    (make request ^action hello)
)
 
 
 (rule hello
    (request ^action hello)
    (write |Hello World!| (crlf))
)

 OPS83 

 module hello (main)
 {  procedure main 
    {
       write  |Hello, world!|, '\n';
    };
 };

 Parrot assembly language 

 print "Hello, world!\n"
 end

 Pascal 

 program hello (output) ;
 begin
     writeln ('Hello, world!') 
 end.

 Perl 

 print "Hello, world!\n";

(This is the first example in Learning Perl; the semicolon is optional.)

 Perl 6 
say "Hello World";

 PHP 

 Hello, world!

or

 <?php
  echo "Hello, world!\n";
 ?>

or

 <?="Hello, world!\n"?>

(Note: This will not work unless short open tags are enabled.)

 Pike 

 int main  {
     write ("Hello, world!\n") ;
     return 0;
 }

 PL/SQL 

 -- start anonymous block
 set serveroutput on size 10000000;
 begin
     dbms_output.enable (1000000) ;
     dbms_output.put_line ('Hello World!') ;
 end;
 -- end anonymous block

 PL/I 

 Test: proc options (main) reorder;
   put skip edit ('Hello, world!') (a) ;
 end Test;

 POP-11 

 'Hello world' =>

 PostScript 
See PDL section

 Processing 

 println ("Hello, world!") ;

 Prolog 

 write ('Hello, world') ,nl.

 Python 

 print "Hello, world!"

หรือใน Python 3.x

 print("Hello, world!")

 REFAL 

 $ENTRY GO{=<Prout 'Hello, world!'>;}

 REXX, ARexx, NetRexx, and Object REXX 

 say "Hello, world!"

 RPL 
See also GUI section.

(On Hewlett-Packard HP-28, HP-48 and HP-49 series graphing calculators.)

 <<
   CLLCD
   "Hello, world!" 1 DISP
   0 WAIT
   DROP
 >>

 Ruby 
See also GUI section.

 puts "Hello, world!"

 SAS 

 data _null_;
 put 'Hello, world!';
 run;

 Sather 

 class HELLO_WORLD is
   main is 
    #OUT+"Hello, world\n"; 
   end; 
 end;

 Scala (programming language) 

 object HelloWorld with Application {
   Console.println ("Hello, world!") ;
 }

 Scriptol 

 print "Hello world!"

 sed 
(note: requires at least one line of input)

 sed -ne '1s/.*/Hello, world!/p'

 Seed7 
$ include "seed7_05.s7i";
 
  const proc: main is func
    begin
      writeln ("Hello, world!") ;
    end func;

 Self 

 'Hello, World!' print.

 Simula 
BEGIN
     OutText ("Hello, world!") ;
     OutImage;
 END

 Smalltalk 

 Transcript show: 'Hello, world!'; cr

 SML 

 print "Hello, world!\n";

 SNOBOL 

     OUTPUT = "Hello, world!"
 END

 Span 

 class Hello {
   static public main: args {
     Console << "Hello, world!\n";
   }
 }

 SPARK 

 with Spark_IO;
 --# inherit Spark_IO;
 --# main_program;
 
 procedure Hello_World
 --# global in out Spark_IO.Outputs;
 --# derives Spark_IO.Outputs from Spark_IO.Outputs;
 is
 begin
   Spark_IO.Put_Line (Spark_IO.Standard_Output, "Hello, world!", 0) ;
 end Hello_World;

 SPITBOL 

     OUTPUT = "Hello, world!"
 END

 SQL 

 CREATE TABLE message (text char (15)) ;
 INSERT INTO message (text) VALUES ('Hello, world!') ;
 SELECT text FROM message;
 DROP TABLE message;

or (e.g. Oracle dialect)

 SELECT 'Hello, world!' FROM dual;

or (for Oracle's PL/SQL proprietary procedural language)
 BEGIN
   DBMS_OUTPUT.ENABLE (1000000) ;
   DBMS_OUTPUT.PUT_LINE ('Hello World, from PL/SQL') ;
 END;

or (e.g. MySQL or PostgreSQL dialect)

 SELECT 'Hello, world!';

or (e.g. T-SQL dialect)

 PRINT 'Hello, world!'

or (for KB-SQL dialect)
 select Null from DATA_DICTIONARY.SQL_QUERY
 
 FOOTER or HEADER or DETAIL or FINAL event
 write "Hello, world!"

 STARLET 

 RACINE: HELLO_WORLD.
 
 NOTIONS:
 HELLO_WORLD : ecrire ("Hello, world!").

 TACL 

 #OUTPUT Hello, world!

 Tcl (Tool command language) 
See also GUI section.

 puts "Hello, world!"

 Turing 

 put "Hello, world!"

 TSQL 

 Declare @Output varchar (16)
 Set @Output='Hello, world!'
 Select @Output
 
or, simpler variations:
 
 Select 'Hello, world!'
 Print 'Hello, world!'

 UNIX-style shell 

 echo 'Hello, world!'

or

 printf '%s' $'Hello, world!\n'

or for a curses interface:

 dialog --msgbox 'Hello, world!' 0 0

 Visual Prolog console program 

 #include @"pfc\console\console.ph"
 
 goal
   console::init  ,
   stdio::write ("Hello World!").

 Graphical user interfaces (GUIs) 

 ActionScript (Macromedia flash mx) 

  this.createTextField ("hello_txt",0,10,10,100,20) ;
  this.hello_txt.text="Hello, world";

 AppleScript 
See also TUI section.

display dialog "Hello World!" buttons {"OK"} default button 1

Or to have the OS synthesize it and literally speak out the words "hello world!" (with no comma, as that would cause the synthesizer to pause)
 say "Hello world!"

 boo 
See also TUI section.
 import System.Drawing
 import System.Windows.Forms
 f = Form 
 f.Controls.Add (Label (Text: "Hello, World!", Location: Point (40,30)))
 f.Controls.Add (Button (Text: "Ok", Location: Point (50, 55) , Click: {Application.Exit  }))
 Application.Run (f)
Functional equivalent of C# program below.

 C# 
See also TUI section.

 using System;
 using System.Drawing;
 using System.Windows.Forms;
 class HelloWorldForm : Form {
     public static void Main  {
         Application.Run (new HelloWorldForm ) ;
     }
    public HelloWorldForm  {
        Label label = new Label  ;
        label.Text = "Hello, World!";
        label.Location = new Point (40,30) ;
        Controls.Add (label) ;
        Button button = new Button  ;
        button.Text = "OK";
        button.Location = new Point (50,55) ;
        Controls.Add (button) ;
        button.Click += new EventHandler (OnButtonOk) ;
    }
     void OnButtonOk (Object sender, EventArgs e) {
        Application.Exit  ;
    }
 }

or ||

 using System;
 using System.Drawing;
 using System.Windows.Forms;
 
 namespace HelloWorld
 {
     public class HelloWorld : Form
     {
         public HelloWorld 
         {
             ShowMessage  ;
         }
         
         [STAThread]
         static void Main  
         {
             Application.Run (new HelloWorld ) ;
         }
         
         private void ShowMessage 
         {
             MessageBox.Show (
                 "Hello World!!!", 
                 "Hello World - C#", 
                 MessageBoxButtons.OK, 
                 MessageBoxIcon.Information, 
                 MessageBoxDefaultButton.Button1) ;
         }
     }
 }
 Cocoa or GNUStep (In Objective C) 
#import <Cocoa/Cocoa.h>
 @interface hello : NSObject {
 }
 @end
 
 @implementation hello
 
 - (void) awakeFromNib
 {	
      NSBeep  ; // we don't need this but it's conventional to beep 
                // when you show an alert
      NSRunAlertPanel (@"Message from your Computer", @"Hello, world!", @"Hi!",
                      nil, nil) ;
 }
 
 @end

 Curl 

 {curl 3.0, 4.0 applet}
 {curl-file-attributes character-encoding = "utf-8"}
 
 Hello, world!

 Delphi, Kylix 

 program Hello_World;
 uses    
   Windows;
    
 begin
   ShowMessage ("Hello, world!") ;
 end.
 Euphoria 
MS-Windows only - basic.
 include msgbox.e
 if message_box ("Hello, world!", "Hello", 0) then end if
MS-Windows only - using Win32Lib library
 include win32lib.ew
 createForm ({
        ";Window; Hello",
        ";Label;  Hello, World!"
    })
 include w32start.ew

 FLTK2 (in C++) 

 #include <fltk/Window.h>
 #include <fltk/Widget.h>
 #include <fltk/run.h>
 using namespace fltk;
    
 int main (int argc, char **argv)
 {
     Window *window = new Window (300, 180) ;
     window->begin  ;
         Widget *box = new Widget (20, 40, 260, 100, "Hello, World!") ;
         box->box (UP_BOX) ;
         box->labelfont (HELVETICA_BOLD_ITALIC) ;
         box->labelsize (36) ;
         box->labeltype (SHADOW_LABEL) ;
      window->end  ;
      window->show (argc, argv) ;
 
     return run  ;
 }

 Gambas 
See also TUI section.

 PUBLIC SUB Main 
   Message.Info ("Hello, world!")
 END

 GTK+ (in C++) 

 #include <iostream>
 #include <gtkmm/main.h>
 #include <gtkmm/button.h>
 #include <gtkmm/window.h>
 using namespace std;
 
 class HelloWorld : public Gtk::Window {
 public:
   HelloWorld  ;
   virtual ~HelloWorld  ;
 protected:
   Gtk::Button m_button;
   virtual void on_button_clicked  ;
 };
 
 HelloWorld::HelloWorld 
 : m_button ("Hello, world!") {
     set_border_width (10) ;
     m_button.signal_clicked .connect (SigC::slot (*this,
                                       &HelloWorld::on_button_clicked)) ;
     add (m_button) ;
     m_button.show  ;
 }
 
 HelloWorld::~HelloWorld  {}
 
 void HelloWorld::on_button_clicked  {
     cout << "Hello, world!" << endl;
 }
 
 int main (int argc, char *argv[]) {
     Gtk::Main kit (argc, argv) ;
     HelloWorld helloworld;
     Gtk::Main::run (helloworld) ;
     return 0;
 }

 GTK+ (in Python) 
from gtk import *
 window = Window (WINDOW_TOPLEVEL)
 window.set_title ("Hello World!")
 window.connect ("destroy", main_quit)
 window.add (VBox )
 window.child.pack_start (Label ("Hello World!"))
 button=Button ("OK")
 window.child.pack_end (button)
 button.connect ("clicked", main_quit)
 window.show_all 
 main 

or

 import gtk
 gtk.MessageDialog (message_format="Hello World!").run 

 Gtk# (in C#) 
using Gtk;
 using GtkSharp;
 using System;
 
 class Hello {
 
     static void Main 
     {
         Application.Init  ;
 
         Window window = new Window ("") ;
         window.DeleteEvent += cls_evn;
         Button close  = new Button ("Hello World") ;
         close.Clicked += new EventHandler (cls_evn) ;
 
         window.Add (close) ;
         window.ShowAll  ;
         
         Application.Run  ;
 
     }
 
     static void cls_evn (object obj, EventArgs args)
     {
         Application.Quit  ;
     }
 
 }

 GTK+ 2.x (in Euphoria) 

 include gtk2/wrapper.e
 
 Info (NULL,"Hello","Hello World!")

 Java 
See also TUI section.

 import javax.swing.JOptionPane;
 
 public class Hello {
     public static void main (String[] args) {
         JOptionPane.showMessageDialog (null, "Hello, world!!") ;
     }
 }

ไฟล์:HelloJava.png

 Java applet 
Java applets work in conjunction with HTML files.

   Hello World
 
  
 HelloWorld Program says:
 
  

 
 

 import 
 import 
 
 public class HelloWorld extends Applet {
   public void paint (Graphics g) {
     g.drawString ("Hello, world!", 100, 50) ;
   }
 }

 JavaScript and JScript 
JavaScript (an implementation of ECMAScript) is a client-side scripting language used in HTML files. The following code can be placed in any HTML file: {     alert ("Hello, world!") ; } //--></script> Hello World Example

An easier method uses JavaScript implicitly, directly calling the reserved alert function. Cut and paste the following line inside the  ....  HTML tags.

 Hello World Example
 

An even easier method involves using popular browsers' support for the virtual 'javascript' protocol to execute JavaScript code. Enter the following as an Internet address (usually by pasting into the address box) :

 javascript:alert ('Hello, world!') ;
There are many other ways:
 javascript:document.write ('Hello, world!\n') ;

 K 

This creates a window labeled "Hello world" with a button labeled "Hello world".

 hello:hello..l:"Hello world"
 hello..c:`button
 `show$`hello

 OPL 
See also TUI section.

(On Psion Series 3 and later compatible PDAs.)

 PROC guihello:
   ALERT ("Hello, world!","","Exit")
 ENDP

or

 PROC hello:
    dINIT "Window Title"
    dTEXT "","Hello World"
    dBUTTONS "OK",13
    DIALOG
 ENDP

 Qt toolkit (in C++) 

 #include <qapplication.h>
 #include <qpushbutton.h>
 #include <qwidget.h>
 #include <iostream>
 
 class HelloWorld : public QWidget
 {
     Q_OBJECT
 
 public:
     HelloWorld  ;
     virtual ~HelloWorld  ;
 public slots:
     void handleButtonClicked  ;
     QPushButton *mPushButton;
 };
 
 HelloWorld::HelloWorld  :
     QWidget  ,
     mPushButton (new QPushButton ("Hello, World!", this))
 {
     connect (mPushButton, SIGNAL (clicked ) , this, SLOT (handleButtonClicked )) ;
 }
 
 HelloWorld::~HelloWorld  {}
 
 void HelloWorld::handleButtonClicked 
 {
     std::cout << "Hello, World!" << std::endl;
 }
 
 int main (int argc, char *argv[])
 {
     QApplication app (argc, argv) ;
     HelloWorld helloWorld;
     app.setMainWidget (&helloWorld) ;
     helloWorld.show  ;
     return app.exec  ;
 }

or

 #include <QApplication>
 #include <QPushButton>
 
 int main (int argc, char *argv[])
 {
   QApplication app (argc, argv) ;
 
   QPushButton hello ("Hello world!") ;
   hello.resize (100, 30) ;
   hello.show  ;
   hello.connect (&hello, SIGNAL (clicked ) , SLOT (close )) ;
   return app.exec  ;
 }

 REAL 

 

 RPL 
See also TUI section.

(On Hewlett-Packard 

 RTML 
Hello 
 TEXT "Hello, world!"

 Ruby with WxWidgets 
See also TUI section.

 require 'wxruby'
 
 class HelloWorldApp < Wx::App
  def on_init
   ourFrame = Wx::Frame.new (nil, -1, "Hello, world!").show
   ourDialogBox = Wx::MessageDialog.new (ourFrame, "Hello, world!", "Information:", \
                  Wx::OK|Wx::ICON_INFORMATION).show_modal
  end
 end
 
 HelloWorldApp.new.main_loop

 Ruby with GTK+ 
See also TUI section.

 require 'gtk2'
 
 Gtk.init
 window = Gtk::Window.new
 window.signal_connect ("delete_event") { Gtk.main_quit; false }
 button = Gtk::Button.new ("Hello World")
 button.signal_connect ("clicked") { Gtk.main_quit; false }
 window.add (button)
 window.show_all
 Gtk.main

 SWT (in Java) 

 import org.eclipse.swt.SWT;
 import org.eclipse.swt.layout.RowLayout;
 
 import org.eclipse.swt.widgets.Shell;
 import org.eclipse.swt.widgets.Label;
 
 public class SWTHello {
     public static void main (String [] args) {
         Display display = new Display  ;
         final Shell shell = new Shell (display) ;
         RowLayout layout = new RowLayout  ;
         layout.justify = true;
         layout.pack = true;
         shell.setLayout (layout) ;
         

 Tcl/Tk 
See also TUI section.

 label .l -text "Hello, world!"
 pack .l

 Python with Tkinter 
See also TUI section.
 import Tkinter
 r = Tkinter.Tk 
 w = Tkinter.Label (r, text="Hello, world!")
 w.pack 
 r.mainloop 
or, more primitively:
 import   

 Visual Basic including VBA 

 Sub Main 
     MsgBox "Hello, world!"
 End Sub

 Visual Prolog note box 

 #include @"pfc\vpi\vpi.ph"
 
 goal
   vpiCommonDialogs::note ("Hello World!").

 Windows API (in C) 

This uses the Windows API to create a full window containing the text. Another example below uses the built-in MessageBox function instead.

 #include <windows.h>
 
 LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM) ;
 
 char szClassName[] = "MainWnd";
 
 int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine,
                    int nCmdShow)
 {
   HWND hwnd;
   MSG msg;
   WNDCLASSEX wincl;
 
   wincl.cbSize = sizeof (WNDCLASSEX) ;
   wincl.cbClsExtra = 0;
   wincl.cbWndExtra = 0;
   wincl.style = 0;
   wincl.hInstance = hInstance;
   wincl.lpszClassName = szClassName;
   wincl.lpszMenuName = NULL; //No menu
   wincl.lpfnWndProc = WindowProcedure;
   wincl.hbrBackground = (HBRUSH) (COLOR_WINDOW + 1) ; //Color of the window
   wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION) ; //EXE icon
   wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION) ; //Small program icon
   wincl.hCursor = LoadCursor (NULL, IDC_ARROW) ; //Cursor
 
   if (!RegisterClassEx (&wincl))
         return 0;
 
   hwnd = CreateWindowEx (0, //No extended window styles
         szClassName, //Class name
         "", //Window caption
         WS_OVERLAPPEDWINDOW & ~WS_MAXIMIZEBOX,
         CW_USEDEFAULT, CW_USEDEFAULT, //Let Windows decide the left and top
                                       //positions of the window
         120, 50, //Width and height of the window,
         NULL, NULL, hInstance, NULL) ;
 
   //Make the window visible on the screen
   ShowWindow (hwnd, nCmdShow) ;
 
   //Run the message loop
   while (GetMessage (&msg, NULL, 0, 0) >0)
   {
         TranslateMessage (&msg) ;
         DispatchMessage (&msg) ;
   }
   return msg.wParam;
 }
 
 LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message,
                                  WPARAM wParam, LPARAM lParam)
 {
   PAINTSTRUCT ps;
   HDC hdc;
   switch (message)
   {
   case WM_PAINT:
         hdc = BeginPaint (hwnd, &ps) ;
         TextOut (hdc, 15, 3, "Hello, world!", 13) ;
         EndPaint (hwnd, &ps) ;
         break;
   case WM_DESTROY:
         PostQuitMessage (0) ;
         break;
   default:
         return DefWindowProc (hwnd, message, wParam, lParam) ;
   }
   return 0;
 }

Or, much more simply:

 #include <windows.h>
 int WINAPI WinMain (HINSTANCE hInst, HINSTANCE hPrevInstance, LPSTR lpCmdLine,
                    int nCmdShow)
 {
     MessageBox (NULL, "Hello, world!", "", MB_OK) ;
     return 0;
 }

 Windows Script Host with VBScript 

                           WScript.Echo "Hello, world!"
         
 

 Windows Script Host with JScript 

                           WScript.Echo ("Hello, world!") ;
         
 

 XSL (T) 

There are many ways to do this in XSL, the simplest being:

 <xsl:template match="/">
   <xsl:text>Hello, world!</xsl:text>
 </xsl:template>

If nested similar to the HTML version, it would be:

 <xsl:template match="/">
               <h1>Hello, world!</h1>
     
   
 </xsl:template>

 XUL 
Type the following in a text file (e.g. hello.world.xul) and then open with Mozilla Firefox.

         Hello, world
   
 

 Esoteric programming languages 
See: Hello world program in esoteric languages

 Document formats 

 ASCII 
The following sequence of characters, expressed in hexadecimal notation (with carriage return and newline characters at end of sequence) :
 48 65 6C 6C 6F 2C 20 77 6F 72 6C 64 21 0D 0A

The following sequence of characters, expressed as binary numbers (with cr/nl as above, and the same ordering of bytes) :
 00–07: 01001000 01100101 01101100 01101100 01101111 00101100 00100000 01110111
 08–0E: 01101111 01110010 01101100 01100100 00100001 00001101 00001010

 LaTeX 2ε 

 \documentclass{article}
 \begin{document}
   Hello, world!
 \end{document}

 Page description languages 

 XHTML 1.1 
(Using UTF-8 character set.)

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
                       "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
   <head>
     <title>Hello, world!</title>
   </head>
   <body>
     <p>Hello, world!</p>
   </body>
 </html>

 HTML 
(simple)

 <html><body>
 <h1>Hello, world!</h1>
 </body></html>

<html> and <body>-tags are not necessary for informal testing. You could even use the following: 

 <pre>Hello, World!</pre>

or simply write it as text without tags.

 HTML 4.01 Strict (full)

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Strict//EN" "http://www.w3.org/TR/html4/strict.dtd">
 <html>
    <head>
     <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
     <title>Hello, World!</title>
    </head>
    <body>
     <p>Hello, world!</p>
    </body>
 </html>

Notice that the HEAD tag is optional and could be omitted.
The first paragraph of the W3C Recommendation on The global structure of an HTML document also features this example.

 PDF 

 %PDF-1.0
 1 0 obj
 <<
 /Type /Catalog
 /Pages 3 0 R
 /Outlines 2 0 R
 >>
 endobj
 2 0 obj
 <<
 /Type /Outlines
 /Count 0
 >>
 endobj
 3 0 obj
 <<
 /Type /Pages
 /Count 1
 /Kids [4 0 R]
 >>
 endobj
 4 0 obj
 <<
 /Type /Page
 /Parent 3 0 R
 /Resources << /Font << /F1 7 0 R >>/ProcSet 6 0 R
 >>
 /MediaBox [0 0 612 792]
 /Contents 5 0 R
 >>
 endobj
 5 0 obj
 << /Length 44 >>
 stream
 BT
 /F1 24 Tf
 100 100 Td (Hello World) Tj
 ET
 endstream
 endobj
 6 0 obj
 [/PDF /Text]
 endobj
 7 0 obj
 <<
 /Type /Font
 /Subtype /Type1
 /Name /F1
 /BaseFont /Helvetica
 /Encoding /MacRomanEncoding
 >>
 endobj
 xref
 0 8
 0000000000 65535 f
 0000000009 00000 n
 0000000074 00000 n
 0000000120 00000 n
 0000000179 00000 n
 0000000322 00000 n
 0000000415 00000 n
 0000000445 00000 n
 trailer
 <<
 /Size 8
 /Root 1 0 R
 >>
 startxref
 553
 %%EOF

 PostScript 

 % Displays on console.
 (Hello world!) =
 
 %!
 % Displays as page output.
 /Courier findfont
 24 scalefont
 setfont
 100 100 moveto
 (Hello world!) show
 showpage

 RTF 

 {\rtf1\ansi\deff0
 {\fonttbl {\f0 Courier New;}}
 \f0\fs20 Hello, world!
 }

 TeX 

 Hello World
 \bye

 Media-based scripting languages 

 AviSynth 

 BlankClip 
 Subtitle ("Hello, world!")

(Creates a video with default properties)

 Lingo (Macromedia Director scripting language) 

 on exitFrame me
   put "Hello, World!"  
 end

Outputs the string to the message window if placed in a hhzhzx movie frame. Alternatively, to display an alert box stating the message you could use

 on exitFrame me
   alert "Hello, World!"
 end

 POV-Ray 

 #include "colors.inc"
 camera {
   location <3, 1, -10>
   look_at <3,0,0>
 }
 light_source { <500,500,-1000> White }
 text {
   ttf "timrom.ttf" "Hello world!" 1, 0
   pigment { White }
 }