What is “Hello, World!”

A “Hello, world!” program is generally a computer program that outputs or displays the message “Hello, world!”. A small piece of code in most general-purpose programming languages, this program is used to illustrate a language’s basic syntax. “Hello, world!” programs are often the first a student learns to write in a given language, and they can also be used as a sanity check to ensure computer software intended to compile or run source code is correctly installed, and that its operator understands how to use it.


“Hello, World!” program

Ada

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

ALGOL60

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BEGIN DISPLAY("Hello, World!") END.

ALGOL68

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begin
  printf(($gl$,"Hello, World!"))
end

AppleScript

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say "Hello, World!"
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display alert "Hello, World!"

BASIC

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PRINT "Hello, World!"

Batchfile

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@echo off
echo Hello, World!

Bash

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echo "Hello, World!"

C

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#include <stdio.h>

int main() {
    printf("Hello, World!");
    return 0;
}

C++

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#include <iostream>

int main() {
    std::cout << "Hello, World!" << std::endl;
    return 0;
}

c#

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Console.WriteLine("Hello, World!");

Clojure

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(println "Hello, World!")

COBOL

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IDENTIFICATION DIVISION.
PROGRAM-ID. HELLO-WORLD.
* simple hello world program
PROCEDURE DIVISION.
    DISPLAY 'Hello, World!'.
    STOP RUN.

D

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import std.stdio;

void main() {
    writeln("Hello, World!");
}

Dart

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void main() {
    print('Hello, World!');
}

Elixir

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IO.puts("Hello, World!")

Ezhil

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பதிப்பி "உலகே வணக்கம்"
பதிப்பி "Hello, World!"
exit()

Forth

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." Hello, World!" CR

Fortran

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program Hello
  print *, "Hello, World!"
end program Hello

Go

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package main
import "fmt"

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

Haskell

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

Java

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

JavaScript

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console.log("Hello, World!");
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document.write("Hello, World!");

Julia

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println("Hello, World!")

Kotlin

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fun main() {
    println("Hello, World!")
}

Lisp

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(print "Hello, World!")
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print [Hello, World!]

Lua

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print("Hello, World!")

Objective-C

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#import <stdio.h>

int main() {
	printf("Hello, world!\n");
}
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#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSLog(@"Hello, World!");
    }
    return 0;
}

OCaml

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print_endline "Hello, World!"

Pascal

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

Perl

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print "Hello, World!\n";

Perl6

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say 'Hello, World!'

PHP

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<?php
  echo 'Hello, World!';
?>

PowerShell

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'Hello, World!'

Prolog

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main() :- write("Hello, World!"), nl.

Python2

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print "Hello, World!"

Python3

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print("Hello, World!")

R

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print("Hello, World!")

Racket

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#lang cli
(displayln "Hello, World!")

Ruby

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puts "Hello, World!"

Rust

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fn main() {
    println!("Hello, World!");
}

Simula

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Begin
   OutText ("Hello, World!");
   Outimage;
End;

Smalltalk

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Transcript show: 'Hello, World!'.

Standard ML

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print "Hello, World!\n"

Swift

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print("Hello, World!")

Tcl

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puts "Hello, world!"

TI-BASIC

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:Disp "HELLO, WORLD!"

VBScript

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WScript.Echo "Hello, World!"

WebAssembly Text Format

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(module
  (import "console" "log" (func $log (param i32) (param i32)))
  (import "js" "mem" (memory 1))
  
  (data (i32.const 0) "Hello World") ;; string written to global memory
  (func (export "helloWorld")
      i32.const 0
      i32.const 11
      call $log
  )
)

易语言

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信息框（“Hello, World!”,0,,）