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 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! edit

Ada edit

 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 edit

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

or

<%="Hello, World!"%>

Alef++ edit

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

main{
     say[Hello, world!];
}

Assembly edit

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 edit

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

BASIC edit

Applesoft BASIC edit

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

10 PRINT "HELLO, WORLD!"

-or-

10 ? "HELLO, WORLD!"

Bally/Astrocade Basic edit

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

10 PRINT "HELLO, WORLD!"

Commodore BASIC edit

As used on a Commodore 64, ca. 1984

10 ? "Hello, world!"

Dark Basic edit

PRINT "Hello, world!"

FreeBASIC and QuickBASIC edit

PRINT "Hello, world!"
SLEEP

or:

? "Hello, world!"
sleep

Intellivision Basic edit

As used on a Mattel Intellivision, ca. 1983

10 PRINT "HELLO, WORLD!"

Intellivision ECS Basic edit

As used in the Mattel Intellivision ECS

10 PRIN "HELLO, WORLD."

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

Liberty BASIC edit

print "Hello, world!"

Batch edit

echo Hello, world!

C edit

#include <stdio.h>

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

C# edit

using System;

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

C++ edit

#include <iostream>
using namespace std;

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

COBOL edit

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

Common Lisp edit

(print "Hello, world!")

Or:

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

Delphi edit

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

Eztrieve (IBM Mainframe programming language). edit

JOB NULL

DISPLAY "HELLO, WORLD"

STOP

Forth edit

: HELLO    ." Hello, world!"  ;
HELLO

Fortran edit

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

Go edit

package main

import "fmt"

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

Haskell edit

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

Html edit

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

Java edit

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

JavaScript (aka JScript, ECMAScript, LiveScript) edit

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

or

alert("Hello, world!");

or

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

Luka edit

print "Hello, world"

or, with proper syntax

print( "Hello, world!" );

Oberon edit

MODULE Hello;

   IMPORT Out;

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

END Hello.

OCaml edit

print_endline "Hello, world!"

Pascal edit

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

Perl edit

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

PHP edit

<?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 edit

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 edit

puts 'Hello, world!'

Another way to do it, albeit more obscure:

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

Tcl edit

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

Trekkie edit

"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 edit

put "Hello World!"

Visual Basic 6 edit

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

Assignment edit

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

Visual Basic .NET edit

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

C edit

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 edit

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

Natural edit

WRITE 'Hello, world!'
END

Hello, world!

XML edit

<?xml version="1.0"?>
<hello>
<messagename="Hello" />
<message>
Hello, World!
</message>
</hello>

Or with attributes:

<?xml version="1.0"?>
<hello messagename="Hello, World!">
Hello, world!
</hello>

MACRO-11 edit

        .TITLE  HELLO WORLD
        .MCALL  .TTYOUT,.EXIT
HELLO:: MOV     #MSG,R1 ;STARTING ADDRESS OF STRING
1$:     MOVB    (R1)+,R0 ;FETCH NEXT CHARACTER
        BEQ     DONE    ;IF ZERO, EXIT LOOP
        .TTYOUT         ;OTHERWISE PRINT IT
        BR      1$      ;REPEAT LOOP
DONE:   .EXIT

MSG:    .ASCIZ /Hello, world!/
        .END    HELLO

More about Computer Programming edit

Topic:Computer Programming

External links edit

The Hello World Collection with 500+ Hello World programs

↑ Kernighan, Brian W.; w:Ritchie, Dennis M. (1978). The C Programming Language (1st ed.). Englewood Cliffs, NJ: Prentice Hall. ISBN 0-13-110163-3.

[1] Kernighan, Brian W.; w:Ritchie, Dennis M. (1978). The C Programming Language (1st ed.). Englewood Cliffs, NJ: Prentice Hall. ISBN 0-13-110163-3.

[1]

Hello, world!

Examples of Hello, world! edit

ASP edit

Alef++ edit

BASH edit

BASIC edit

Applesoft BASIC edit

Bally/Astrocade Basic edit

Commodore BASIC edit

Dark Basic edit

FreeBASIC and QuickBASIC edit

Intellivision Basic edit

Intellivision ECS Basic edit

Liberty BASIC edit

Batch edit

COBOL edit

Common Lisp edit

Eztrieve (IBM Mainframe programming language). edit

Haskell edit

JavaScript (aka JScript, ECMAScript, LiveScript) edit

Assignment edit

Visual Basic .NET edit

C edit

LOLCODE edit

Natural edit

XML edit

More about Computer Programming edit

See also edit

External links edit