hello world 为什么我们看到学习中有这一句话！！！

Hello World ，中文意思：你好，世界。世界上的第一个程序就是Hello World，由Brian Kernighan创作。

Hello, world"程序是指在计算机屏幕上输出“Hello,world”这行字符串的计算机程序，“hello, world”的中文意思是“世界，你好”。这个例程在Brian Kernighan 和Dennis M. Ritchie合著的《The C Programme Language》使用而广泛流行。因为它的简洁，实用，并包含了一个该版本的C程序首次出现在1974年Brian Kernighan所撰写的《Programming in C: A Tutorial》

printf("hello,world\n");

实际上将“Hello”和“World”一起使用的程序最早出现于1972年，出现在贝尔实验室成员Brian Kernighan撰写的内部技术文件《Introduction to the Language B》之中：

main(){

    extern a,b,c;

    putchar(a);putchar(b);putchar(c);putchar('!*n');

}

a'hell';

b'o,w';

c'orld';

最初的"hello, world"打印内容有个标准，即全小写，有逗号，逗号后空一格，且无感叹号。不过沿用至今，完全遵循传统标准形式的反而很少出现。^[1]

我们刚开始接触计算机语言大多从Hello world 开始，下面是各种语言的Hello world program：

AAuto

import win;//导入窗口支持库

import console;//导入控制台支持库

//两个斜杠开始表示注释语句:在控制台显示信息

console.log("Hello,world!");

//弹出一个消息对话框

win.msgbox("Hello,world!","我的第一个程序")

//关闭控制台

console.close();

ActionScript 3

package{

    import flash.display.Sprite;

    public class Main extends Sprite{

        public function Main(){

            trace("Hello,World");

        }

    }

}

Ada

with Ada.Text_Io;useAda.Text_Io;

procedureHellois

begin

Put_Line("Hello,world!");

endHello;

AmigaE

PROCmain()

WriteF('Hello,World!')

ENDPROC

APL

'HelloWorld'

ASP

<%response.write "Hello,world!"%>

D语言

import std.stdio;

int main(char[][]args)

{

writefln("

Hello

World

!");

return0;

}

汇编

Accumulator-only architecture: DEC PDP-8, PAL-III assembler

See the Example section of the PDP-8 article.

Accumulator + index register machine: MOS 6502, CBM, ca65 asm

MSG:.ASCIIZ"Hello,world!"

LDX#0

LDAMSG,X;loadinitialchar

@LP:JSR$FFD2;CHROUTCBMKERNAL

INX

LDAMSG,X

BNE@LP

RTS

Accumulator/Indexmicrocodedmachine:DataGeneralNova,RDOS

SeetheexamplesectionoftheNovaarticle.

Expandedaccumulatormachine:Intelx86,MS-DOS,TASM

MODELSMALL

IDEAL

STACK100H

DATASEG

MSGDB'Hello,world!$'

CODESEG

MOVAX,@data

MOVDS,AX

MOVDX,OFFSETMSG

MOVAH,09H;DOS:outputASCII$string

INT21H

MOVAX,4C00H

INT21H

END

General-purpose-register CISC: DECPDP-11, RT-11, MACRO-11

.MCALL.REGDEF,.TTYOUT,.EXIT

.REGDEF

HELLO:MOV#MSG,R1

MOVB(R1),R0

LOOP:.TTYOUT

MOVB+(R1),R0

BNELOOP

.EXIT

MSG:.ASCIZ/HELLO,WORLD!/

.ENDHELLO

CISC:VAX,VMS,MACRO32

.titlehello

term_name:.ascid/SYS$INPUT/

term_chan:.blkw1

out_iosb:.blkq1

msg:.asciz/Hello,world!/

.entrystart,0

;establishachannelforterminalI/O

$assign_sdevnam=term_name,-

chan=term_chan

blbcr0,error

;queuetheI/Orequest

$qio_schan=term_chan,-

func=#io$_writevblk,-

iosb=out_iosb,-

p1=msg,-

p2=#13

blbcr0,error

$exit_s;normalexit

error:halt;errorcondition

.endstart

AWK

BEGIN{print"Hello,world!"}

BASIC

PRINT"HELLOWORLD"

MS BASIC

(traditional, unstructured)

PRINT"Hello,world!"

END

TI-BASIC

isp"Hello,world!"

Structured BASIC

print"Hello,world!"

BCPL

GET"LIBHDR"

LETSTART()BE

$(

WRITES("Hello,world!*N")

$)

BF

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

>++.>+.+++++++..+++.>++.<<+++++++++++++++.

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

C/C++

int main(void)

{

    puts("HelloWorld");

    return 0;

}

C

#include <stdio.h>

int main(void)

{

    printf("Hello,world!\n");

    return 0;

}

C++

#include <stdlib.h>

#include <iostream>

using namespace std;

int main()

{

    cout << "Hello,world!" << endl;

    system("pause");

    return 0;

}

C#

using System;

class HelloWorldApp

{

    public static void Main(string[] args)

    {

        Console.WriteLine("Helloworld!");

                Console.Read();

    }

}

Clean

modulehello

Start::String

Start="Hello,world"

CLIST

PROC 0

WRITE 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!~%")

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!\n").

Forth

." Hello, world!" CR

Fortran

PROGRAMHELLO

WRITE(*,10)

10FORMAT('Hello,world!')

STOP

END

Google Go

package main

import "fmt"

func main() {

fmt.Println("Hello, world!")

}

Haskell

module HelloWorld (main) where

main = putStr "Hello World\n"

Iptscrae

ON ENTER {

"Hello, " "World!" & SAY

}

Java

public class HelloWorld{

    public static void main(String[] args){

        System.out.println("HelloWorld!");

    }

}

JavaScript

(function(){

alert("HelloWorld!");

})

();

KL

operator entry ()

{

report("hello, world")

}

LOGO

PR "HELLO,WORLD

Lua

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

MSDOS batch

@echo hello world

@pause

OCaml

let _ =

print_endline "Hello world!";;

OPL

PROC hello:

PRINT "Hello, World"

ENDP

Objective-C

#import <Foundation/Foundation.h>

int main(int argc, const char* argv[])

{

    @autoreleasepool{

        NSLog(@"Hello,World!");

    }

    return0;

}

Pascal

programhello_world;

begin

writeln('HelloWorld!');

end.

Perl

print "Hello, world!\n";

PHP

<?php

print("Hello,world!");

?>

或者:

<?php

echo"Hello,world!";

?>

Pike

#!/usr/local/bin/pike

intmain(){

write("Hello,world!\n");

return0;

}

PL/I

Test: procedure options(main);

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

put skip list(My_String);

end Test;

Python

#3.0以下版本：

print"Hello,world!"

#3.0及其以上版本：

print('Hello,world')

REXX

alsoNetRexxand Object REXX

say "Hello, world!"

Ruby

print"Hello,world!\n"

RPGLE

D Vc_Hello s 100A

C Eval Vc_Hello = 'Hello World!'

C DSPLY Vc_Hello

Sather

class HELLO_WORLD is

main is

#OUT+"Hello World\n";

end;

Scheme

(display "Hello, world!")

(newline)

Sed

(requires at least one line of input)

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

Self

'Hello, World!' uppercase print.

Smalltalk

Transcript show: 'Hello, world!'

SML

print "Hello, world!\n";

SNOBOL

OUTPUT = "Hello, world!"

END

SQL

数据库操作版

create table MESSAGE(TEXT char(15));

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

select TEXT from MESSAGE;

drop table MESSAGE;

简单版

print'Hello,World.'

StarOffice Basic

sub main

print "Hello, World"

end sub

swift

println("Hello,world")

Tcl

puts "Hello, world!"

Turing

put "Hello, world!"

UNIX-style shell

echo 'Hello, world!'

Romanian pseudocode

(UBB Cluj-Napoca)Algoritmul Salut este:

fie s:="Hello, world";

tipareste s;

sf-Salut