“Hello, World!”程序是一个只在计算机屏幕上打印出“Hello, World!”(英语,意为“世界,你好!”)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。 A.aUWh
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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》。 <IWO:7*#
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以下是用不同语言写成的Hello World程序的几个例子: $F|3VQ~
Ada [whX),3>
with Ada.Text_Io; use Ada.Text_Io; N? r{Y$x
procedure Hello is c2aX_ "
begin ZXP9{Hh
Put_Line ("Hello, world!"); 3g!tk9InG
end Hello; Yx4TUA$c'
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汇编语言 }%K)R5C
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x86 CPU,DOS,TASM 3jMHe~.E<
MODEL SMALL ')kn
IDEAL ;A~efC^<
STACK 100H Tw|cg B
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DATASEG O s*B%,}
HW DB 'Hello, world!$' h
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CODESEG gO kq>i_
MOV AX, @data jmgU'w-s
MOV DS, AX {\!_S+}{
MOV DX, OFFSET HW 3urL*Fw,
MOV AH, 09H gxry?':
INT 21H U$;FOl
MOV AX, 4C00H BU-m\Kf)
INT 21H ^oNk}:>
END )Mw<e
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x86 CPU,GNU/Linux,NASM R5i v]8X4W
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). XH_XGzBQS
;Enter this into "hello.asm" then type: 5$kv,%ah
;"nasm -f elf hello.asm" 1'qllkT
;"ld hello.o -o hello" 1&S34wJF
;"./hello" 95Q{d'&
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section .data ;data section declaration 9[<,49
msg db 'Hello World!',0AH 6#egy|("nF
len equ $-msg ;string length qJY'"_Q{
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section .text ;code section declaration q8U*
global _start ;entry point (start of execution) RP}.Ei
_start: mov edx,len ;string length ?]i.Zi\[f
mov ecx,msg ;string start 9G7lPK
mov ebx,1 ;file handle: stdout +8tdAw
mov eax,4 ;sys_write 86[/NTD<-
int 80h ;kernel system call W2CCLq1(
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mov ebx,0 ;return value (DzV3/+p^
mov eax,1 ;sys_exit rQ0V3x1"Qx
int 80h ;kernel system call *XRAM.
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x86 CPU,Windows,MASM32 "c[ D0{\{
.386 uWs5+
.model flat,stdcall >EQd;Af
option casemap:none }]0f -}
;Include 文件定义 9mdp\A
include windows.inc i
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include user32.inc h{ s- e.
includelib user32.lib y/!h.[
include kernel32.inc $tGk,.#j
includelib kernel32.lib EAVB:gE
;数据段 Tvd=EO
.data Y9h~ hD
szCaption db 'A MessageBox!',0 x1\a_Kt
szText db 'Hello,world!',0 <S*o}:iB
;代码段 GEr]zMYG[A
.code
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start: seT?:PCA
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK J|k~e,C
invoke ExitProcess,NULL yqdhLX|Mk
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Jh3(5d"MV
end start o$k1&hyH
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BEGIN { print "Hello, world!" } nl9G1Sm(E
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BASIC X{SD3j=G#
传统版BASIC(例如GWBASIC): /b *VFA/75
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10 PRINT "Hello, world!" 2jQ|4$9j
20 END (+'*_
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或在提示符输入: * A B
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?"Hello, world!":END dpHK~n j\_
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现代版BASIC(例如Quick BASIC): G.KZZ-=_4
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Print "Hello, world!" n:c)R8X]
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以下的语句在Quick BASIC中同样有效: O=wA/T=w?
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? "Hello,world!" 16q"A$
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BCPL S^}@X?v
GET "LIBHDR" RIXUzKLO
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LET START () BE :-x F=Y(;
$( S<Zb>9pl
WRITES ("Hello, world!*N") w!{g^*R+!
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Befunge ;M '?k8L
"!dlrow olleH">v cnh\K.*}_x
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#include <stdio.h> @}&o(q1M0
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int main(void) Hd(|fc{2
{ MqXN,n+`k
printf("Hello, world!\n"); SooSOOAx[
return 0; D4?qw$"
} m09
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C++ /JPyADi
#include <iostream> "g7`Ytln
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int main() uQ4WM
{ Z2d,J>-
std::cout << "Hello, world!" << std::endl; K9Dxb
return 0; {3Z&C$:s
} Y$8
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C++/CLI lxTW1kr
int main() X5kIM\
{ ;5tSXgGw7
System::Console::WriteLine("Hello, world!"); XjpFJ#T*$A
} Q>s> @hw
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C# (C Sharp) Cg NfqT0
class HelloWorldApp [bH5UTA
{ j>s>i
public static void Main() X^4HYm
{ 9H5S@w[je
System.Console.WriteLine("Hello, world!"); Qn>0s
} ^`
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} BR5r K
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COBOL Y=JfV
IDENTIFICATION DIVISION. M/
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PROGRAM-ID. HELLO-WORLD. yP\KIm!
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ENVIRONMENT DIVISION. ^S*~<0NQ'
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DATA DIVISION. E )D*~2o/
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PROCEDURE DIVISION. ;' !G?)PZ
DISPLAY "Hello, world!". b;#Z/phix
STOP RUN. oGpyuB@A/
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Common Lisp $fSV8 n;Y
(format t "Hello world!~%") Tvr2K84l
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DOS批处理 X
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@echo off dwOB)B@{H
echo "Hello, world!" "`Q~rjc$2
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Eiffel F"xD^<i
class HELLO_WORLD =}5;rK
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creation 8:c[_3w
make 1au1DvH
feature "\bbe @
make is MKSiOM
local fvKb0cIx]
io:BASIC_IO nff&~lwhZ
do Afi;s.,
!!io NDLk+n
io.put_string("%N Hello, world!") 6?nAO
end -- make uNe5Mv|}
end -- class HELLO_WORLD &VtTUy}
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Erlang 1euL+zeh
-module(hello). gZ6]\l]J{
-export([hello_world/0]). uev$5jlX
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hello_world() -> io:fwrite("Hello, World!\n"). )`?Es8uW
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Forth wzhM/Lmo\z
." Hello, world!" CR .-t#wXEi
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Fortran y\&GPr
WRITE(*,10) 7)sEW#d!
10 FORMAT('Hello, World!') K:&FWl.
STOP Gqvnc8V&
END |FS,Av
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HTML *het_;)+{
<HTML> 7g1"s1~or
<HEAD> cwiHHf>
<TITLE> Hello World! </TITLE> ;=piJ%k
</HEAD> Htn'(Q
<BODY> '6Dt@^-PZ
<p>Hello World!</p> p.,o@GcL~
</BODY> qUX
</HTML> ,Oojh;P_
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