Redirected from Hello world
This is a traditional first program to write when learning a new programming language, and can be a useful sanity test to make sure that a language's compiler, development environment[?], and run-time environment are correctly installed.
Although this is a trivial exercise in a system where all of these are pre-configured, configuring a complete programming tool chain 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 minimal test programs such as this existed since the development of programmable computers, the tradition of using "Hello, world!" as the test message was probably started by its use as an example program in the book The C Programming Language, by Brian Kernighan and Dennis Ritchie.
Here are some examples in different languages:
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with Ada.Text_Io; use Ada.Text_Io; procedure Hello is begin Put_Line ("Hello, world!"); end Hello;
MODEL SMALL IDEAL STACK 100H
DATASEG HW DB 'Hello, world!$'
CODESEG MOV AX, @data MOV DS, AX MOV DX, OFFSET HW MOV AH, 09H INT 21H MOV AX, 4C00H INT 21H END
BEGIN { print "Hello, world!" }
Traditional - Unstructured BASIC 10 PRINT "Hello, world!" 20 END
More modern versions - Structured BASIC print "Hello, world!"
GET "LIBHDR"
LET START () BE $( WRITES ("Hello, world!*N") $)
"!dlrow olleH">v , ^_@
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< +++++++++++++++.>.+++.------.--------.>+.>.
#include <stdio.h>
int main(void) { printf("Hello, world!\n"); return 0; }
#include <iostream> using namespace std;
int main() { cout << "Hello, world!" << endl; return 0; }
class HelloWorldApp { public static void Main() { System.Console.WriteLine("Hello, world!"); } }
IDENTIFICATION DIVISION. PROGRAM-ID. HELLO-WORLD.
ENVIRONMENT DIVISION.
DATA DIVISION.
PROCEDURE DIVISION. DISPLAY "Hello, world!". STOP RUN.
(format t "Hello world!~%")
@echo off echo "Hello, world!"
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").
." Hello, world!" CR
WRITE(*,10) 10 FORMAT('Hello, World!') STOP END
H
PLEASE DO ,1 <- #13 DO ,1 SUB #1 <- #238 DO ,1 SUB #2 <- #112 DO ,1 SUB #3 <- #112 DO ,1 SUB #4 <- #0 DO ,1 SUB #5 <- #64 DO ,1 SUB #6 <- #238 DO ,1 SUB #7 <- #26 DO ,1 SUB #8 <- #248 DO ,1 SUB #9 <- #168 DO ,1 SUB #10 <- #24 DO ,1 SUB #11 <- #16 DO ,1 SUB #12 <- #158 DO ,1 SUB #13 <- #52 PLEASE READ OUT ,1 PLEASE GIVE UP
public class Hello { public static void main(String[] args) { System.out.println("Hello, world!"); } }
print "Hello, world!"
TERM EQU 19 the MIX console device number ORIG 1000 start address START OUT MSG(TERM) output data at address MSG HLT halt execution MSG ALF "MIXAL" ALF " HELL" ALF "O WOR" ALF "LD " END START end of the program
let main () = print_endline "Hello world!";;
program Hello; begin writeln('Hello, world!'); end.
#!/usr/local/bin/perl print "Hello, world!\n";
<?php print("Hello, world!"); ?>
#!/usr/local/bin/pike int main() { write("Hello, world!\n"); return 0; }
Test: procedure options(main); declare My_String char(20) varying initialize('Hello, world!'); put skip list(My_String); end Test;
#!/usr/local/bin/python print "Hello, world!"
say "Hello, world!"
#!/usr/bin/ruby print "Hello, world!\n"
(display "Hello, world!") (newline)
sed -ne '1s/.*/Hello, world!/p'
Transcript show: '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;
#!/usr/local/bin/tcl puts "Hello, world!"
put "Hello, world!"
#!/bin/sh echo 'Hello, world!'
MsgBox "Hello, world!"
#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); }
import java.awt.*; import java.awt.event.*;
public class HelloFrame extends Frame { HelloFrame(String title) { super(title); } public void paint(Graphics g) { super.paint(g); java.awt.Insets ins = this.getInsets(); g.drawString("Hello, World!", ins.left + 25, ins.top + 25); } public static void main(String args []) { HelloFrame fr = new HelloFrame("Hello");
fr.addWindowListener( new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit( 0 ); } } ); fr.setResizable(true); fr.setSize(500, 100); fr.setVisible(true); } }
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 is a scripting language used in HTML files. To demo this program Cut and Paste the following code into any HTML file.
<script language="javascript"> function helloWorld() { javascript: alert("Hello World"); } </script>
<a class=encyclopedia href="javascript:this.location()" onclick="javascript:helloWorld();">Hello World Example</a>
<a class=encyclopedia href="#" onclick="alert('Hello World')">Hello World Example</a>
<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <box align="center"> <label value="Hello, world!" /> </box> </window>
<HTML> <HEAD> <TITLE>Hello, world!</TITLE> </HEAD> <BODY> Hello, world! </BODY> </HTML>
/font /Courier findfont 24 scalefont font setfont 100 100 moveto (Hello World!) show showpage
Non-CS Manager
mail -s "Hello, world." joe@b12 Joe, could you please write me a program that prints "Hello, world."? I need it by tomorrow. ^D
Non-CS Senior Manager
% zmail jim I need a "Hello, world." program by this afternoon.
Chief Executive
% letter letter: Command not found. % mail To: ^X ^F ^C % help mail help: Command not found. % damn! !: Event unrecognized % logout
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