"Hello, World!" program: Difference between revisions
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mPushButton(new QPushButton("Hello, world!", this)) |
mPushButton(new QPushButton("Hello, world!", this)) |
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{ |
{ |
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connect(mPushButton, SIGNAL(clicked()), this, SLOT(handleButtonClicked())); |
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<nowiki> |
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#include <QApplication> |
#include <QApplication> |
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#include <QPushButton> |
#include <QPushButton> |
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#include <QVBoxLayout> |
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int main(int argc, char *argv[]) |
int main(int argc, char *argv[]) |
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{ |
{ |
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QApplication app(argc, argv); |
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QWidget *window = new QWidget; |
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QVBoxLayout *layout = new QVBoxLayout(window); |
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hello.resize(100, 30); |
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//connect the button to quitting |
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layout->addWidget(hello); |
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layout->setMargin(10); |
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layout->setSpacing(10); |
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} |
} |
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</nowiki> |
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[[Image:Pic2oy.png]] |
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=== [[REALbasic]] === |
=== [[REALbasic]] === |
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Revision as of 23:51, 24 December 2005
A "hello world" program is a computer program that 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 simplest programs possible in a computer language. Some, however, are surprisingly complex, especially in some graphical user interface (GUI) contexts; but most are very simple, 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 liquid crystal display (LCD) (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 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]
There are many variations on the punctuation and casing of the phrase, and the examples on this page print out several of these variations. Variations include the presence or lack of the comma and exclamation mark, and the capitalisation of the 'H', both 'H' and 'W', or neither. The most commonly accepted variation, despite not being the original text, is "Hello, world!" Some languages are forced to implement different forms, such as "HELLO WORLD!," on systems that only support capital letters, while many "hello world" programs in esoteric languages print out a slightly modified string. For example, the Malbolge program prints "HEllO WORld", this having been determined to be "good enough." "Hello world" programs also normally print a newline character or character sequence (either ASCII-10 or 13,10).
A collection of "hello world" programs written in various computer languages is often used as a very simple "Rosetta Stone" to assist in learning and comparing the languages. This is somewhat ironic, in that the original intent of the "hello world" program was to be a trivially simple, uninteresting program used to demonstrate every part of the programming process besides the code itself. Arguably, then, a "hello world" program is, by design, a poor choice to showcase a language. However, since it is common practice, a number of examples are included below.
Here are some examples in different languages:
Text user interface (Known as TUI, console or line-oriented)
4GL - Computer Associates with Ingres/DB
message "Hello, world!" with style = popup;
REPORT ZELLO. WRITE 'Hello, world!'.
WRITE "Hello, world!"
with Ada.Text_IO; procedure Hello is begin Ada.Text_IO.Put_Line ("Hello, world!"); end Hello;
For explanation see wikibooks:Ada Programming:Basic.
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!") )
PROC main()
WriteF('Hello, world!');
ENDPROC
'Hello world'
See also GUI section.
return "Hello world!"
<%
Response.Write("Hello world")
%>
- or simply:
<%="Hello world" %>
Response.Write("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 #$F3
@LP: LDA MSG-$F3,X ; load character
JSR $FFD2 ; CHROUT (KERNAL), output to current output device (screen)
INX
BNE @LP ;
RTS
Accumulator/Index microcoded machine: Data General Nova, RDOS
See the example section of the Nova article.
MODEL SMALL
IDEAL
STACK 100H
DATASEG
MSG DB 'Hello, world!', 13, '$'
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
OR
include \masm32\include\windows.inc include \masm32\include\user32.inc includelib \masm32\lib\user32.lib .data szHello BYTE "Hello, World!",0 .code Start: invoke MessageBox, 0, OFFSET szHello, OFFSET szHello, MB_OK or MB_ICONINFORMATION ret end Start
.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
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
string BYTE "Hello, world!",#a,0 string to be printed (#a is newline and 0 terminates the string)
Main GETA $255,string get the address of the string in register 255
TRAP 0,Fputs,StdOut put the string pointed to by register 255 to file StdOut
TRAP 0,Halt,0 end process
General-purpose-register CISC: DEC PDP-11, RT-11, MACRO-11
.MCALL .REGDEF,.TTYOUT,.EXIT
.REGDEF
HELLO: MOV #MSG,R1
MOVB (R1),R0
LOOP: .TTYOUT
MOVB +(R1),R0
BNE LOOP
.EXIT
MSG: .ASCIZ /HELLO, WORLD!/
.END HELLO
.title hello
.psect data, wrt, noexe
chan: .blkw 1
iosb: .blkq 1
term: .ascid "SYS$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
.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
RISC processor: MIPS architecture
.data
msg: .asciiz "Hello, world!"
.align 2
.text
.globl main
main:
la $a0,msg
li $v0,4
syscall
jr $ra
MsgBox, "Hello, world!"
MsgBox(1,'','Hello, world!')
BEGIN { print "Hello, world!"; exit }
echo Hello,\ world!
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.
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
sub main
print "Hello, world"
end sub
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
Sub Main MsgBox "Hello world!" End Sub
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
Print "Hello, world!"
PRINT "HELLO WORLD" TEXT 0,0,"Hello world" WAIT KEY
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
See also GUI Section.
print "Hello, world!"
Casio FX-9750
This program will work on the fx-9750 graphing calculator and compatibles.
"HELLO WORLD"↵
#include <stdio.h>
int main(void)
{
puts("Hello, world!");
return 0;
}
The above C code can run in Ch as examples. The simple one in Ch is:
printf("Hello, world\n");
See also GUI Section.
class HelloWorldApp
{
static void Main()
{
System.Console.WriteLine("Hello, world!");
}
}
#include <iostream>
int main()
{
std::cout << "Hello, world!\n";
}
int main()
{
System::Console::WriteLine("Hello, world!");
}
#using <mscorlib.dll>
using namespace System;
int wmain()
{
Console::WriteLine("Hello, world!");
}
ColdFusion (CFM)
<cfoutput>Hello, world!</cfoutput>
PRINT "Hello, World!"
.method public static void Main() cil managed
{
.entrypoint
.maxstack 8
ldstr "Hello, world!"
call void [mscorlib]System.Console::WriteLine(string)
ret
}
module hello Start = "Hello, world"
PROC 0 WRITE Hello, World!
? "Hello world!"
IDENTIFICATION DIVISION. PROGRAM-ID. HELLO-WORLD. ENVIRONMENT DIVISION. DATA DIVISION. PROCEDURE DIVISION. DISPLAY "Hello, world!". STOP RUN.
import std.stdio;
void main()
{
writefln("Hello, world!");
}
DC an arbitrary precision calculator
[Hello, world!]p
DCL batch
$ write sys$output "Hello, world!"
// 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!");
}
module: hello
format-out("Hello, world!\n");
a hello world! . p
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!")
print_endline "Hello world"
"Hello world" print
@once::msgbox "Hello World"; exit:
"hello" < main
{
main ->
stef(;)
stofn
skrifastreng(;"Halló Veröld!"),
stofnlok
}
*
"GRUNNUR"
;
type "Hello, world!",!
or
t "Hello, world!",!
-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;
: halloforth ( -- ) ." Hello, world!" CR ;
PROGRAM HELLO
PRINT *, 'Hello, world!'
END
?((pp "Hello, world!"))
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")
Or to show a splash screen message:
show_message("Hello world")
module Main (main) where main = putStr "Hello world\n"
or
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
put "Hello world"
or
Answer "Hello World"
print,"Hello world!"
[ Main; print "Hello, world!^"; ];
"Hello world!" print
or
write("Hello world!\n")
ON ENTER {
"Hello, " "world!" & SAY
}
Simplest:
Hello world
Probably closest in semantics:
'Hello world'
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 = "!"
See also GUI section.
public class HelloWorld
{
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
document.write('Hello, World!');
or with an alert
alert('Hello, World!');
`0:"Hello world\n"
WriteLine "Hello, world!"
Lisp has many dialects that have appeared over its almost fifty-year history.
(format t "Hello world!~%")
or
(write-line "Hello world!")
or merely:
"Hello world!"
(display "Hello, world!") (newline)
(print "Hello world")
print [Hello world!]
or
pr [Hello World!]
In mswlogo only
messagebox [Hi] [Hello World]
print "Hello, world!"
screen:print(1,1,"Hello, world!") screen:flip()
W "Hello, world!"
print("Hello, world!")$
print("Hello, world!");
Print["Hello world"]
disp('Hello world')
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;
MODULE Hello;
FROM Terminal2 IMPORT WriteLn; WriteString;
BEGIN
WriteString("Hello, world!");
WriteLn;
END Hello;
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!
: main me @ "Hello, world!" notify ;
WRITE "Hello, world!" END
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 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.
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; }
#import <Foundation/Foundation.h>
int main (int argc, const char * argv[])
{
NSLog(@"Hello, world!");
return 0;
}
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))
)
module hello (main)
{ procedure main( )
{
write() |Hello, world!|, '\n';
};
};
print "Hello, world!\n" end
program hello;
begin
writeln('Hello, world!')
end.
print "Hello, world!\n";
(This is the first example in Learning Perl; the semicolon is optional.)
say "Hello world";
Hello, world!
or
<?php
echo "Hello, world!";
//or
print('Hello, world!');
?>
or
<?="Hello, world!"?>
(Note: This will not work unless short open tags are enabled.
int main() {
write("Hello, world!\n");
return 0;
}
-- start anonymous block
set serveroutput on size 10000000;
begin
dbms_output.enable(1000000);
dbms_output.put_line('Hello world!');
end;
-- end anonymous block
Test: proc options(main) reorder;
put skip edit('Hello, world!') (a);
end Test;
'Hello world' =>
See PDL section
println("Hello world!");
write('Hello world'),nl.
print "Hello, world!"
$ENTRY GO{=<Prout 'Hello, world!'>;}
REXX, ARexx, NetRexx, and Object REXX
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!");
}
print "Hello world!"
(note: requires at least one line of input)
sed -ne '1s/.*/Hello, world!/p'
'Hello, World!' print.
BEGIN
OutText("Hello world!");
OutImage;
END
Transcript show: 'Hello, world!'; cr
print "Hello, world!\n";
OUTPUT = "Hello, world!" END
class Hello {
static public main: args {
Console << "Hello world!\n";
}
}
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)
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!"
RACINE: HELLO_WORLD.
NOTIONS:
HELLO_WORLD : ecrire("Hello, world!").
#OUTPUT Hello, world!
Tcl (Tool command language)
See also GUI section.
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 '%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";
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!"
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.
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 );
}
}
}
#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 3.0, 4.0 applet}
{curl-file-attributes character-encoding = "utf-8"}
Hello, world!
program Hello_World;
uses
Windows;
begin
ShowMessage("Hello, world!");
end.
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();
}
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();
}
}
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!!");
}
}
- 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 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:
<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 are many other ways:
javascript:document.write('Hello, world!\n');
This creates a window labeled "Hello world" with a button labeled "Hello world".
hello:hello..l:"Hello world" hello..c:`button `show$`hello
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>
#include <QVBoxLayout>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QWidget *window = new QWidget;
QVBoxLayout *layout = new QVBoxLayout(window);
QPushButton *hello = new QPushButton("Hello, World!", window);
//connect the button to quitting
hello->connect(hello, SIGNAL(clicked()), &app, SLOT(quit()));
layout->addWidget(hello);
layout->setMargin(10);
layout->setSpacing(10);
window->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!"
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
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
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 ();
}
}
See also TUI section.
label .l -text "Hello, world!" pack .l
See also TUI section.
import Tkinter r = Tkinter.Tk() w = Tkinter.Label(r, text="Hello, world!") w.pack() r.mainloop()
or, more primitively:
import tkMessageBox as mb mb.showinfo(message="Hello, world!")
Ubercode 1 class Hello
public function main()
code
call Msgbox("Hello", "Hello, world!")
end function
end class
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;
}
<job id="HelloWorld">
<script language="VBScript">
WScript.Echo "Hello, world!"
</script>
</job>
<job id="HelloWorld">
<script language="JScript">
WScript.Echo( "Hello, world!" ) ;
</script>
</job>
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="/">
<html>
<body>
<h1>Hello, world!</h1>
</body>
</html>
</xsl:template>
Type the following in a text file (e.g. hello.world.xul) and then open with Mozilla Firefox or another Gecko-based browser.
<?xml-stylesheet href="chrome://global/skin" type="text/css" ?> <window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" align="center" pack="center" flex="1"> <description>Hello, world</description> </window>
Esoteric programming languages
See: Hello world program in esoteric languages
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 08–0E: 01101111 01110010 01101100 01100100 00100001 00001101 00001010
LaTeX 2ε
\documentclass{article}
\begin{document}
Hello, world!
\end{document}
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>
(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-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
% Displays on console. (Hello world!) = %! % Displays as page output. /Courier findfont 24 scalefont setfont 100 100 moveto (Hello world!) show showpage
{\rtf1\ansi\deff0
{\fonttbl {\f0 Courier New;}}
\f0\fs20 Hello, world!
}
Hello world \bye
Media-based scripting languges
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 single movie frame. Alternatively, to display an alert box stating the message you could use
on exitFrame me alert "Hello, world!" end
#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 }
}
See also
- Hello world program in esoteric languages
- Fibonacci number program
- Trabb Pardo-Knuth algorithm
- Just another Perl hacker
- List of basic computer science topics
- 99 Bottles of Beer computer program
External links
- ACM "Hello World" project
- "HelloWorld online on Web, and steps beyond HelloWorld"
- "How the way people code "Hello World" varies depending on their age and job" – From the GNU Humor Collection
- A Collection of Hello World Programs
- Another Collection of Hello World Programs with 200+ programs, including "Hello World" in several human languages
- http://www.99-bottles-of-beer.net/ 99 bottles ... over 600 programming languages used ...
- smaller one site "mirror" of the very impressive site 99 bottles site mentioned above
- A bunch of Visual FoxPro way to write a Hello World program