Hello World

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本文介绍了Hello, World!程序，这是一个简单的程序，通常作为初学者学习编程语言的第一个实例。文章列举了多种编程语言实现该程序的方法，包括C、Python、Java等。

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“Hello, World!”程序是一个只在计算机屏幕上打印出“Hello, World!”字串的计算机程序。该程序通常是计算机程序设计语言的初学者所要学习编写的第一个程序。它还可以用来确定该语言的编译器、程序开发环境以及运行环境已经正确安装。

将Hello World程序作为第一个学写的程序，现在已经成为一种传统。该程序最早出现在由Brian Kernighan和Dennis Ritchie写的计算机程序设计教程《C语言程序设计》。

以下是用不同语言写成的Hello World程序的几个例子：

目录
1 打印到终端
1.1 Ada
1.2 汇编语言
1.2.1 x86 CPU，DOS，TASM
1.2.2 x86 CPU，GNU/Linux，NASM
1.2.3 x86 CPU，Windows，MASM32
1.3 AWK
1.4 BASIC
1.5 BCPL
1.6 Befunge
1.7 Brainfuck
1.8 C
1.9 C++
1.10 C++/CLI
1.11 C# (C Sharp)
1.12 COBOL
1.13 Common Lisp
1.14 DOS批处理
1.15 Eiffel
1.16 Erlang
1.17 Forth
1.18 Fortran
1.19 次
1.20 HQ9+
1.21 INTERCAL
1.22 Java
1.23 JSP
1.24 MIXAL
1.25 Nuva
1.26 OCaml
1.27 Pascal
1.28 Perl
1.29 PHP
1.30 Pike
1.31 PL/I
1.32 Prolog
1.33 Python
1.34 REXX
1.35 Ruby
1.36 Scheme
1.37 sed （需要至少一行输入）
1.38 Smalltalk
1.39 SNOBOL
1.40 SQL
1.41 Tcl
1.42 TScript
1.43 Turing
1.44 UNIX-style shell
2 GUI
2.1 Delphi
2.2 Nuva
2.3 Visual Basic
2.4 Visual FoxPro
2.5 X11
2.6 Java
2.7 Java Applet
2.8 java script
2.9 PostScript

1 打印到终端

Ada

with Ada.Text_Io; use Ada.Text_Io;

procedure Hello is

begin

Put_Line ("Hello, world!");

end Hello;

汇编语言

x86 CPU，DOS，TASM

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

x86 CPU，GNU/Linux，NASM

;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax).

;Enter this into "hello.asm" then type:

;"nasm -f elf hello.asm"

;"ld hello.o -o hello"

;"./hello"

section .data ;data section declaration

msg db 'Hello World!',0AH

len equ $-msg ;string length

section .text ;code section declaration

global _start ;entry point (start of execution)

_start: mov edx,len ;string length

mov ecx,msg ;string start

mov ebx,1 ;file handle: stdout

mov eax,4 ;sys_write

int 80h ;kernel system call

mov ebx,0 ;return value

mov eax,1 ;sys_exit

int 80h ;kernel system call

x86 CPU，Windows，MASM32

.386

.model flat,stdcall

option casemap:none

;Include 文件定义

include windows.inc

include user32.inc

includelib user32.lib

include kernel32.inc

includelib kernel32.lib

;数据段

.data

szCaption db 'A MessageBox!',0

szText db 'Hello,world!',0

;代码段

.code

start:

invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK

invoke ExitProcess,NULL

;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

end start

AWK

BEGIN { print "Hello, world!" }

BASIC

传统版BASIC（例如GWBASIC）：

10 PRINT "Hello, world!"

20 END

或在提示符输入：

?"Hello, world!":END

现代版BASIC（例如Quick BASIC）：

Print "Hello, world!"

以下的语句在Quick BASIC中同样有效：

? "Hello,world!"

BCPL

GET "LIBHDR"

LET START () BE

WRITES ("Hello, world!*N")

Befunge

"!dlrow olleH">v

^_@

Brainfuck

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

+++++++++++++++.>.+++.------.--------.>+.>.

#include <stdio.h>

int main(void)

{

printf("Hello, world! ");

return 0;

}

C++

#include <iostream>

int main()

{

std::cout << "Hello, world!" << std::endl;

return 0;

}

C++/CLI

int main()

{

System::Console::WriteLine("Hello, world!");

}

C# (C Sharp)

class HelloWorldApp

{

public static void Main()

{

System.Console.WriteLine("Hello, world!");

}

COBOL

IDENTIFICATION DIVISION.

PROGRAM-ID. HELLO-WORLD.

ENVIRONMENT DIVISION.

DATA DIVISION.

PROCEDURE DIVISION.

DISPLAY "Hello, world!".

STOP RUN.

Common Lisp

(format t "Hello world!~%")

DOS批处理

@echo off

echo "Hello, world!"

Eiffel

class HELLO_WORLD

creation

make

feature

make is

local

io:BASIC_IO

!!io

io.put_string("%N Hello, world!")

end -- make

end -- class HELLO_WORLD

Erlang

-module(hello).

-export([hello_world/0]).

hello_world() -> io:fwrite("Hello, World! ").

Forth

." Hello, world!" CR

Fortran

WRITE(*,10)

10 formAT('Hello, World!')

STOP

END

HTML

<HTML>

<HEAD>

<TITLE> Hello World! </TITLE>

</HEAD>

<BODY>

<p>Hello World!</p>

</BODY>

</HTML>

HQ9+

INTERCAL

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

Java

public class Hello

{

public static void main(String[] args)

{

System.out.println("Hello, world!");

}

JSP

out.print("Hello, world!");

MIXAL

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

Nuva

<..直接输出..>

Hello, world!

<..或者..>

// 不带换行

? "Hello, world!"

// 或者

// 带换行

?? 'Hello, world!'

OCaml

let main () =

print_endline "Hello world!";;

Pascal

program Hello;

begin

writeln('Hello, world!');

end.

Perl

#!/usr/local/bin/perl

print "Hello, world! ";

PHP

<?php

print("Hello, world!");

Pike

#!/usr/local/bin/pike

int main()

{

write("Hello, world! ");

return 0;

}

PL/I

Test: procedure options(main);

declare My_String char(20) varying initialize('Hello, world!');

put skip list(My_String);

end Test;

Prolog

goal

write("hello,world!").

Python

#!/usr/local/bin/python

print "Hello, world!"

REXX

say "Hello, world!"

Ruby

#!/usr/bin/ruby

print "Hello, world! "

Scheme

(display "Hello, world!")

(newline)

sed （需要至少一行输入）

sed -ne '1s/.*/Hello, world!/p'

Smalltalk

Transcript show: 'Hello, world!'

SNOBOL

OUTPUT = "Hello, world!"

END

SQL

create table MESSAGE (TEXT char(15));

insert into MESSAGE (TEXT) values ('Hello, world!');

select TEXT from MESSAGE;

drop table MESSAGE;

Tcl

#!/usr/local/bin/tcl

puts "Hello, world!"

TScript

? "Hello, world!"

Turing

put "Hello, world!"

UNIX-style shell

程序中的/bin/sh可改为您使用的shell

#!/bin/sh

echo 'Hello, world!'

2 GUI

Delphi

program HelloWorld;

uses

Dialogs;

begin

ShowMessage('Hello, World!');

end.

Nuva

System.Ui.ShowMessage('Nuva', 'Hello, world!', ['OK'])

Visual Basic

MsgBox "Hello, world!"

'或者

Print "Hello, world!"

Visual FoxPro

? "Hello, world!"

X11

用一个程序

xmessage 'Hello, world!'

用C++和gtkmm 2

#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);

}

Java

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 Applet

Java Applet用于HTML文件。

HTML代码:

<HTML>

<HEAD>

<TITLE>Hello World</TITLE>

</HEAD>

<BODY>

HelloWorld Program says:

</APPLET>

</BODY>

</HTML>

Java代码:

import java.applet.*;

import java.awt.*;

public class HelloWorld extends Applet

{

public void paint(Graphics g)

{

g.drawString("Hello, world!", 100, 50);

}

java script

java script是一种用于HTML文件的脚本语言。要查看以下程序的运行结果，只要将其复制到任何HTML文本即可。

function helloWorld()

{

alert("Hello World");

}

</script>

<a href="java script:this.location()"

onclick="java script:helloWorld();">Hello World Example</a>

PostScript

PostScript是一种专门用来创建图像的语言，常用于打印机。

/font /Courier findfont 24 scalefont

font setfont

100 100 moveto

(Hello World!) show

showpage

width="728" scrolling="no" height="90" frameborder="0" align="middle" src="http://kofreestyler.googlepages.com/csdnGGad.htm" marginheight="0" marginwidth="0">