Hello, world! este un program de calculator foarte simplu care doar afișează pe dispozitivul de ieșire (de obicei, ecran) textul englez Hello, world!. Este folosit pentru a testa funcționarea compilatorului sau pentru a ilustra începătorilor limbajul de programare ales.

Report ZHello.
write 'Hello, World!'.

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

BEGIN
   DISPLAY ("Hello, world!");
END.

display dialog "Hello, world!"

#include <MsgBoxConstants.au3>
 
Msgbox($MB_ICONINFORMATION, "", "Hello, world!")

BEGIN { print "Hello, world!" }

PRINT "Hello, world!"

@echo Hello, World!

print "Hello, world!"

++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.

#include <stdio.h>
 
int main(void)
{
    printf("Hello, World!\n");
    return 0;
}

#include <iostream>
int main()
{
    std::cout << "Hello, world!" << std::endl;
    return 0;
}

sau

#include <iostream>
using namespace std;
int main()
{
    cout << "Hello, world!" << endl; // endl sau "\n";
    return 0;
}

class HelloWorldApp
{
    static void Main()
    {
        System.Console.WriteLine("Hello, world!");
    } 
}

module hello
 Start :: {#Char}
 Start = "Hello, world!"

alert('Hello, world!')

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

println("Hello, world!")

program hello
    write(*,*) 'Hello, world!'
end program hello

module Main (main) where
 
main = putStrLn "Hello, world!"

'Hello, world!'

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

document.write('Hello, world!');

sau ca un mesaj de alertă:

alert('Hello, world!');

(print "Hello world!")

(let ((hello0 (lambda() (display "Hello world") (newline))))
  (hello0))

HAI
CAN HAS STDIO?
VISIBLE "HAI WORLD!"
KTHXBYE

print("Hello, world!")

disp('Hello, world!')

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

#import <stdio.h>
#import <Foundation/Foundation.h>
 
int main(void)
{
    NSLog(@"Hello, world!\n");
    return 0;
}

 DISPLAY "Hello World!".

{Show 'Hello, world!}

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

print "Hello, world!\n";

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

sau, mai simplu:

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

main :- write('Hello, world!'), nl.

print ( "Hello, world!" )

sau

  import sys
  sys.stdout.write("Hello, world!\n")

cat('Hello, world!\n')

say Hello, world!

print "Hello, world!"

(let ((hello0 (lambda() (display "Hello world") (newline))))
  (hello0))

$ include "seed7_05.s7i";

const proc: main is func
  begin
    writeln("Hello, world!");
  end func;

Transcript show: 'Hello, world!'.

SELECT 'Hello, world!' FROM DUMMY;
SELECT 'Hello, world!' FROM DUAL;
SELECT 'Hello, world!';

puts "Hello, world!"

put "Hello, world!"

Sub Main()
  Print "Hello, world!"
End Sub