Hello world program
A "hello world" program is a computer program that simply
prints out "Hello world!" on a display device. It is used in many introductory tutorials for teaching a programming language and many students use it as their first
programming experience in a language.
Such a program is typically one of the simpler programs possible in a computer language. Some are surprisingly complex,
especially in some graphical user interface (GUI)
contexts. Some others are very simple, however, especially those which rely heavily on a particular command line interpreter ("shell") to perform the actual
output. In many embedded systems, the text may be sent to a one or
two-line LCD display (and in yet other systems, a
simple LED being turned on may substitute for "Hello
world!").
A "hello world" program can be a useful sanity test to make sure that a
language's compiler, development environment, and run-time environment are correctly installed. Configuring a complete programming toolchain from scratch to the point where even trivial programs can be compiled and run
may involve substantial amounts of work. For this reason, a simple program is used first when testing a new tool chain.
While small test programs existed since the development of programmable computers, the tradition of using the phrase "Hello world!" as the test message was influenced by an example
program in the book The C
Programming Language, by Brian Kernighan and Dennis Ritchie, published in 1978. The
example program from that book prints "hello, world" (i.e., no capital letters, no exclamation sign; those have
entered the tradition later). The book had inherited the program from a 1974 Bell Laboratories internal memorandum by Kernighan —Programming in C: A
Tutorial— which shows the first known version of the program:
main( ) {
printf("hello, world");
}
However, the first known instance of the usage of the words "hello" and "world" together in computer literature is in A
Tutorial Introduction to the Language B, by Brian Kernighan, 1973. [1] (http://cm.bell-labs.com/cm/cs/who/dmr/bintro.html)
A collection of "hello world" programs written in various computer languages can serve as a very simple "Rosetta Stone" to assist in learning and comparing the languages. Keep in mind,
however, that unless assembly language or similar very low-level
(hardware-near) languages are involved, not much "computing" (calculation) is usually exhibited.
Here are some examples in different languages:
| Contents |
1.1 ABC
1.2 Ada
1.3 AmigaE
1.4 APL
1.5 Assembly language
1.5.1 Accumulator-only architecture: DEC PDP-8,
PAL-III assembler
1.5.2 First successful
µP/OS combinations: Intel 8080/Zilog Z80, CP/M, RMAC assembler
1.5.3 Accumulator + index
register machine: MOS Technology 6502, CBM KERNAL, ca65 assembler
1.5.4 Accumulator/Index microcoded machine: Data
General Nova, RDOS
1.5.5 Expanded accumulator machine: Intel x86, DOS,
TASM
1.5.6 Expanded accumulator machine: Intel x86, Linux,
GAS
1.5.7 General-purpose fictional computer: MIX, MIXAL
1.5.8 General-purpose-register CISC: DEC PDP-11, RT-11,
MACRO-11
1.5.9 CISC on advanced multiprocessing OS: DEC VAX,
VMS, MACRO-32
1.5.10 RISC processor: ARM, RISC OS, BBC BASIC's
in-line assembler
1.6 AWK
1.7 BASIC
1.8 BCPL
1.9 BLISS
1.10 boo
1.11 C
1.12 C#
1.13 C++
1.14 ColdFusion (CFM)
1.15 CIL
1.16 Clean
1.17 CLIST
1.18 COBOL
1.19 Common Lisp
1.20 D
1.21 DCL batch
1.22 Ed and Ex (Ed extended)
1.23 Eiffel
1.24 Erlang
1.25 EUPHORIA
1.26 F#
1.27 Focus
1.28 Forte TOOL
1.29 Forth
1.30 FORTRAN
1.31 Frink
1.32 Gambas
1.33 Game Maker
1.34 Haskell
1.35 Heron
1.36 HP-41 & HP-42S
1.37 IDL
1.38 Inform
1.39 Io
1.40 Iptscrae
1.41 Java
1.42 JVM
1.43 Kogut
1.44 Logo
1.45 Lua
1.46 M (MUMPS)
1.47 Mathematica
1.48 MATLAB
1.49 Modula-2
1.50 MS-DOS batch
1.51 MUF
1.52 Oberon
1.53 Objective C
1.54 OCaml
1.55 OPL
1.56 OPS5
1.57 Pascal
1.58 Perl
1.59 PHP
1.60 Pike
1.61 PL/SQL
1.62 PL/I
1.63 POP-11
1.64 POV-Ray
1.65 Processing
1.66 Prolog
1.67 Python
1.68 REXX, NetRexx, and Object REXX
1.69 RPL
1.70 Ruby
1.71 SAS
1.72 Sather
1.73 Scala
1.74 Scheme
1.75 sed
1.76 Self
1.77 Smalltalk
1.78 SML
1.79 SNOBOL
1.80 SPARK
1.81 SPITBOL
1.82 SQL
1.83 STARLET
1.84 TACL
1.85 Tcl (Tool command language)
1.86 Turing
1.87 TSQL
1.88 UNIX-style shell
|
WRITE "Hello World"
with Ada.Text_IO;
procedure Hello is
begin
Ada.Text_IO.Put_Line ("Hello, world!");
end Hello;
For explanation see wikibooks:Programming:Ada:Basic.
PROC main()
WriteF('Hello, World!')
ENDPROC
'Hello World'
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 #0
LDA MSG,X ; load initial char
@LP: JSR $FFD2 ; chrout
INX
LDA MSG,X
BNE @LP
RTS
See the example section of the
Nova article.
Expanded accumulator machine: Intel x86, DOS,
TASM
MODEL SMALL
IDEAL
STACK 100H
DATASEG
MSG DB 'Hello, world!', 13, '$'
CODESEG
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
.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 $0x80
General-purpose fictional computer: MIX, MIXAL
TERM EQU 19 console device no. (19 = typewriter)
ORIG 1000 start address
START OUT MSG(TERM) output data at address MSG
HLT halt execution
MSG ALF "HELLO"
ALF " WORL"
ALF "D "
END START end of program
General-purpose-register CISC: DEC PDP-11, RT-11, MACRO-11
.MCALL .REGDEF,.TTYOUT,.EXIT
.REGDEF
HELLO: MOV #MSG,R1
MOVB (R1),R0
LOOP: .TTYOUT
MOVB +(R1),R0
BNE LOOP
.EXIT
MSG: .ASCIZ /HELLO, WORLD!/
.END HELLO
CISC on advanced multiprocessing OS: DEC VAX, VMS, MACRO-32
.title hello
.psect data, wrt, noexe
chan: .blkw 1
iosb: .blkq 1
term: .ascid "SYS$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
or the even smaller version (from qUE);
SWI"OS_WriteS":EQUS"Hello, world!":EQUB0:ALIGN:MOVPC,R14
BEGIN { print "Hello, world!" }
MS BASIC (traditional, unstructured)
10 PRINT "Hello, world!"
20 END
10 ?"Hello, world!"
20 END
On TI-80-TI-86 calculators.
:Disp "Hello, world!"
On TI-89/TI-92 calculators.
:HelloWorld()
:Prgm
:Disp "Hello, world!"
:EndPrgm
sub main
print "Hello, World"
end sub
Structured BASIC
print "Hello, world!"
end
True BASIC
Print "Hello, world!"
End
Visual BASIC
To output to the debug console:
Debug.Print "Hello, world!"
To output a message box to the user:
VBA.Interaction.MsgBox "Hello, world!"
GET "LIBHDR"
LET START () BE
$(
WRITES ("Hello, world!*N")
$)
%TITLE 'HELLO_WORLD'
MODULE HELLO_WORLD (IDENT='V1.0', MAIN=HELLO_WORLD,
ADDRESSING_MODE (EXTERNAL=GENERAL)) =
BEGIN
LIBRARY 'SYS$LIBRARY:STARLET';
EXTERNAL ROUTINE
LIB$PUT_OUTPUT;
GLOBAL ROUTINE HELLO_WORLD =
BEGIN
LIB$PUT_OUTPUT(%ASCID %STRING('Hello World!'))
END;
END
ELUDOM
print "Hello, world!"
#include <stdio.h>
int main(void)
{
printf("Hello, world!\n");
return 0;
}
using System;
class HelloWorldApp {
public static void Main() {
Console.WriteLine("Hello, world!");
}
}
#include <iostream>
using namespace std;
int main()
{
cout << "Hello, world!" << endl;
}
<cfoutput>
Hello, world!
</cfoutput>
.method public static void Main() cil managed
{
.entrypoint
.maxstack 8
ldstr "Hello, world!"
call void [mscorlib]System.Console::WriteLine(string)
ret
}
module hello
Start :: String
Start = "Hello, world"
PROC 0
WRITE Hello, World!
IDENTIFICATION DIVISION.
PROGRAM-ID. HELLO-WORLD.
ENVIRONMENT DIVISION.
DATA DIVISION.
PROCEDURE DIVISION.
DISPLAY "Hello, world!".
STOP RUN.
(format t "Hello world!~%")
int main() {
printf("Hello, world!\n");
return 0;
}
$ write sys$output "Hello, world!"
Ed and Ex (Ed extended)
a
hello world!
.
p
or like so:
echo -e 'a\nhello world!\n.\np'|ed
echo -e 'a\nhello world!\n.\np'|ex
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
-module(hello).
-export([hello_world/0]).
hello_world() -> io:fwrite("Hello, world!\n").
puts(1, "Hello, world!")
type data =
{ first: string;
second: string; }
let myData =
{ first="Hello";
second="world"; }
let _ =
print_string myData.first;
print_string " ";
print_string myData.second;
print_newline()
-TYPE Hello World
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;
." Hello, world!" CR
PROGRAM HELLO
WRITE(*,10)
10 FORMAT('Hello, world!')
STOP
END
println["Hello, world!"]
See also GUI section.
PUBLIC SUB Main()
Print "Hello, world!"
END
In the draw event of some object:
draw_text(x,y,"Hello World");
module HelloWorld (main) where
main = putStr "Hello World\n"
program HelloWorld;
functions {
_main() {
print_string("Hello, world!");
}
}
end
(Handheld Hewlett-Packard RPN-based alphanumeric engineering calculators.)
01 LBLTHELLO
02 THELLO, WORLD
03 PROMPT
print,"Hello world!"
[ Main;
print "Hello, world!^";
];
"Hello world!" print
or
write("Hello world!\n")
ON ENTER {
"Hello, " "World!" & SAY
}
See also GUI section.
public class Hello {
public static void main(String[] args) {
System.out.println("Hello, world!");
}
}
(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
WriteLine "Hello, world!"
print [hello world!]
or
pr [Hello World!]
In mswlogo only
messagebox [Hi] [Hello World]
print "Hello, world!"
W "Hello, world!"
Print["Hello World"]
disp('Hello World')
MODULE Hello;
FROM Terminal2 IMPORT WriteLn; WriteString;
BEGIN
WriteString("Hello, world!");
WriteLn;
END Hello;
(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!
: main
me @ "Hello, world!" notify
;
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.
#import <Foundation/Foundation.h>
int main (int argc, const char * argv[])
{
NSLog(@"Hello, World!");
return 0;
}
let _ =
print_endline "Hello world!";;
See also GUI section.
PROC hello:
PRINT "Hello, World"
ENDP
(object-class request
^action)
(startup
(strategy MEA)
(make request ^action hello)
)
(rule hello
(request ^action hello)
-->
(write |Hello World!| (crlf))
)
program Hello (output);
begin
writeln('Hello, world!')
end.
print "Hello, world!";
<?php
echo "Hello, world!\n";
?>
int main() {
write("Hello, world!\n");
return 0;
}
procedure print_hello_world as
dbms_output.put_line("Hello World!");
end print_hello_world;
Test: proc options(main) reorder;
put skip edit('Hello, world!') (a);
end Test;
'Hello world' =>
#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 }
}
println("Hello world!");
write('Hello world'),nl.
print "Hello, world!"
say "Hello, world!"
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
>>
See also GUI section.
puts "Hello, world!"
data _null_;
put 'Hello World!';
run;
class HELLO_WORLD is
main is
#OUT+"Hello World\n";
end;
end;
object HelloWorld with Application {
Console.println("Hello, world!");
}
(display "Hello, world!")
(newline)
(note: requires at least one line of input)
sed -ne '1s/.*/Hello, world!/p'
'Hello, World!' print.
Transcript show: 'Hello, world!'
print "Hello, world!\n";
OUTPUT = "Hello, world!"
END
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;
OUTPUT = "Hello, world!"
END
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)
SET SERVEROUTPUT ON
BEGIN
DBMS_OUTPUT.PUT_LINE('Hello World, from PL/SQL');
END;
or (e.g. MySQL 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!"
RACINE: HELLO_WORLD.
NOTIONS:
HELLO_WORLD : ecrire("Hello, world!").
#OUTPUT Hello, world!
Tcl (Tool command language)
puts "Hello, world!"
put "Hello, world!"
Declare @Output varchar(16)
Set @Output='Hello, world!'
Select @Output
or, simpler variations:
Select 'Hello, world!'
Print 'Hello, world!'
echo 'Hello, world!'
or
printf "Hello, world! \n"
Graphical user interfaces (GUIs)
trace ("hello, world!")
display dialog "Hello, world!"
Or to have the OS synthesize it and literally say "hello world!"
say "Hello world!" -- no comma as that would cause the synthesizer to pause
#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
ShowMessage("Hello, world!");
See also TUI section.
PUBLIC SUB Main()
Message.Info("Hello, world!")
END
#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;
}
using Gtk;
using GtkSharp;
using System;
class Hello {
static void Main()
{
Application.Init ();
Window window = new Window ("helloworld");
window.Show();
Application.Run ();
}
}
include gtk2/wrapper.e
Info(NULL,"Hello","Hello World!")
See also TUI section.
import javax.swing.JOptionPane;
public class Hello {
public static void main(String[] args) {
JOptionPane.showMessageDialog(null, "Hello, world!");
System.exit(0);
}
}
- Java applets work in conjunction with HTML files.
<HTML>
<HEAD>
<TITLE>Hello World</TITLE>
</HEAD>
<BODY>
HelloWorld Program says:
<APPLET CODE="HelloWorld.class" WIDTH=600 HEIGHT=100>
</APPLET>
</BODY>
</HTML>
import java.applet.*;
import java.awt.*;
public class HelloWorld extends Applet {
public void paint(Graphics g) {
g.drawString("Hello, world!", 100, 50);
}
}
- 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:
<script type="text/javascript"><!--
function helloWorld()
{
alert("Hello, world!");
}
//--></script>
<a href="#" onclick="helloWorld(); return false;">Hello World Example</a>
- An easier method uses JavaScript implicitly, directly calling the reserved alert function. Cut and paste the following
line inside the <body> .... </body> HTML tags.
<a href="#" onclick="alert('Hello, world!'); return false;">Hello World Example
</a>
- 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 is an almost infinite number of ways to do it:
javascript:document.write('Hello, world!\n');
See also TUI section.
(On Psion Series 3 and
later compatible PDAs.)
PROC guihello:
ALERT("Hello, world!","","Exit")
ENDP
#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();
}
MsgBox "Hello, world!"
See also TUI section.
(On Hewlett-Packard HP-48G
and HP-49G series calculators.)
<< "Hello, World!" MSGBOX >>
Hello ()
TEXT "Hello, world!"
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Display;
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);
shell.setText("Hello, World!");
Label label = new Label(shell, SWT.CENTER);
label.setText("Hello, World!");
shell.pack();
shell.open ();
while (!shell.isDisposed ()) {
if (!display.readAndDispatch ()) display.sleep ();
}
display.dispose ();
}
}
Sub Main()
MsgBox "Hello, world!"
End Sub
#include <windows.h>
LRESULT CALLBACK WindowProcedure(HWND, UINT, WPARAM, LPARAM);
char szClassName[] = "MainWnd";
HINSTANCE hInstance;
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInstance, LPSTR lpCmdLine,
int nCmdShow)
{
HWND hwnd;
MSG msg;
WNDCLASSEX wincl;
hInstance = hInst;
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;
}
WScript.Echo "Hello, world!"
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
<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<box align="center">
<label value="Hello, world!" />
</box>
</window>
Document Formats
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--0F: 01101111 01110010 01101100 01100100 00100001 00001101 00001010 DONTCARE*
(* The DONTCARE marker fills in for byte #0F, i.e. #15, which comes after our string.)
HTML 4.01 Strict
(Using UTF-8 character set.)
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Hello, world!</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Hello, world!</p>
</body>
</html>
\documentclass{article}
\begin{document}
Hello, world!
\end{document}
{\rtf1\ansi\deff0
{\fonttbl {\f0 Courier New;}}
\f0\fs20 Hello, world!
}
(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>
/Courier findfont 24 scalefont setfont
100 100 moveto
(Hello world!) show
showpage
- In executing the interpreter, one can simply write
(Hello world!) stack
Hello world
\bye
See also
External links
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