Hello, world!

As described in more detail in the related Wikipedia article, Hello, world! is a classic "first program" one creates when learning a new programming language. The objective of the application is the same: to print the text "Hello, world!" to the screen in some form, be it console output or a dialog.

In many cases, the statement required to do this is just a single line.

It seems appropriate that our introduction to Computer Science occupied this title. As a student, the first choice to make is to decide what kind of knowledge you are looking for. Of course, this depends upon your needs. You might be:

A learned computer scientist or professional eager to contribute research and course material
Computer professional seeking an alternative to expensive commercial certification
Adult non-computer professional or entrepreneur who could benefit from academic/practical knowledge of computing
College-eligible (or not) student considering a degree
Casual user trying to to catch/spread the next virus
Hobbyist or computer gamer looking to get the most out of your computing experience
Complete newbie looking for a place to start

This is an exciting time for education, and for those of us wishing to collaborate and share knowledge, skills and experience. At present, we are only limited by the sky, and some very large hard drives in a server farm somewhere.

Examples of Hello, world!

Ada

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

For an explanation see b:Ada Programming:Basic.

ASP

<%
    Response.Write "Hello, world!"
%>

or

<%="Hello, World!"%>

Alef++

sub say : void {
	System->out->println[ $0#0 ];
}

main{
     say[Hello, world!];
}

Assembly

x86 compatible for MS-DOS.

 title Hello World Program 
 dosseg 
 .model small 
 .stack 100h 
 .data 
 hello_message db 'Hello, world!',0dh,0ah,'$' 
 .code
  main  proc
     mov    ax,@data
     mov    ds,ax
     mov    ah,9
     mov    dx,offset hello_message
     int    21h
     mov    ax,4C00h
     int    21h
 main  endp
 end   main

BASH

#!/bin/bash
echo "Hello, world!"

BASIC

Applesoft BASIC

Used on Apple ][ machines (Apple ][+, ][e, //c, ][GS)

10 PRINT "HELLO, WORLD!"

-or-

10 ? "HELLO, WORLD!"

Bally/Astrocade Basic

As used on the Bally and Astrocade game systems ca. 1978

10 PRINT "HELLO, WORLD!"

Commodore BASIC

As used on a Commodore 64, ca. 1984

10 ? "Hello, world!"

Dark Basic

PRINT "Hello, world!"

FreeBASIC and QuickBASIC

PRINT "Hello, world!"
SLEEP

or:

? "Hello, world!"
sleep

Intellivision Basic

As used on a Mattel Intellivision, ca. 1983

10 PRINT "HELLO, WORLD!"

Intellivision ECS Basic

As used in the Mattel Intellivision ECS

10 PRIN "HELLO, WORLD."

! not on ECS keyboard. Only 4 char. commands in ECS Basic

Liberty BASIC

print "Hello, world!"

Batch

echo Hello, world!

C

#include <stdio.h>

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

C#

using System;

namespace HelloWorld
{
  class Program 
  {
    static void Main() 
    {
      Console.WriteLine("Hello, world!");
    }
  }
}

C++

#include <iostream>
using namespace std;

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

COBOL

      IDENTIFICATION DIVISION.
      PROGRAM-ID. HELLO-WORLD.
      PROCEDURE DIVISION.
          DISPLAY 'Hello, world'.
          STOP RUN.

Common Lisp

(print "Hello, world!")

Or:

(format t "Hello, world!~%")

Delphi

begin
  Writeln('Hello, world!');
end.

Eztrieve (IBM Mainframe programming language).

JOB NULL

DISPLAY "HELLO, WORLD"

STOP

Forth

: HELLO    ." Hello, world!"  ;
HELLO

Fortran

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

Go

package main

import "fmt"

func main() {
	fmt.Println("Hello, World")
}

Haskell

main :: IO ()
main = putStrLn "Hello, world!"

Html

<html>
<head>
<title>Hello, world!</title>
</head>
<body>
<p>
Hello, world!
</p>
</body>
</html>

Java

class HelloWorldApp {
    public static void main(String[] args) {
        System.out.println("Hello World!"); // Display the string.
    }
}

JavaScript (aka JScript, ECMAScript, LiveScript)

document.println("Hello, world!");

or

alert("Hello, world!");

or

document.writeln("Hello, world!");

Luka

print "Hello, world"

or, with proper syntax

print( "Hello, world!" );

Oberon

MODULE Hello;

   IMPORT Out;

   PROCEDURE World*;
   BEGIN
      Out.Open;
      Out.String("Hello, world!"); Out.Ln;
   END World;

END Hello.

OCaml

print_endline "Hello, world!"

Pascal

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

Perl

#!/usr/bin/perl
print "Hello, world!\n";

PHP

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

or (with short_tags enabled in php.ini)

<? echo "Hello, world!"; ?>

or (with asp_tags enabled in php.ini)

<% echo "Hello, world!"; %>

or

<?="Hello, world!"?>

Python

With Python 2

#!/usr/bin/env python
print 'Hello, world!'

Or with Python 3

print("Hello, world!")

The first line is used on Unix systems only, and is optional even there. The advantage is that it allows the file to be invoked directly (if chmod +x), without explicitly specifying the python interpreter.

Ruby

puts 'Hello, world!'

Another way to do it, albeit more obscure:

#!/usr/local/bin/ruby
puts 1767707668033969.to_s(36)

Tcl

#!/usr/bin/tclsh
puts "Hello, world!"

Trekkie

"Computer?"
*Bee bee boo
"Create program 'Hello, World! Picard-alpha-1'"
*Boo boo bee
"Parameters: Display the phrase 'Hello, world!' on the screen the program is executed from until the 
program is terminated."
*Bee bee
"Save program."
*Boo bee boo

Turing

put "Hello World!"

Visual Basic 6

Sub Form1_Load()
    MsgBox "Hello, world!"
End Sub

Assignment

Create a Hello, world! program in a language not listed above, then edit this page and add it to the collection.

Visual Basic .NET

Module Module1
 
    Sub Main()
        Console.WriteLine("Hello, world!")
    End Sub
 
End Module

C

Because the tradition of using the phrase "Hello, world!" as a test message was influenced by an example program in the seminal book The C Programming Language.^[1] that original example is reproduced here.

#include <stdio.h>

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

LOLCODE

 HAI
 CAN HAS STDIO?
 VISIBLE "Hello world!"
 KTHXBYE

Natural

WRITE 'Hello, world!'
END