“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。 +`.,6TNVlY
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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》。 12 bztlv
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以下是用不同语言写成的Hello World程序的几个例子: N<aMUV m
Ada FC8#XZp
with Ada.Text_Io; use Ada.Text_Io; Odbm"Y
procedure Hello is dca?(B!'6
begin ,)t/1oQ}>^
Put_Line ("Hello, world!"); Jrx]/CM
end Hello; ^:o^g'Yab
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汇编语言 ZJ|&t
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x86 CPU,DOS,TASM 8s6^!e&
MODEL SMALL oBWa\N
IDEAL cb _nlG!
STACK 100H IjRUL/\=
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DATASEG ?qczMck_
HW DB 'Hello, world!$' |Q#CQz
j 4eq.{$
CODESEG \l/<[ZZ
MOV AX, @data UphZRgT!N
MOV DS, AX ":01M},RA
MOV DX, OFFSET HW Yr 1k\q
MOV AH, 09H 3xpygx9
INT 21H WI\h@qSB
MOV AX, 4C00H Vpf7~2[q%
INT 21H E
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END IlMst16q5
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x86 CPU,GNU/Linux,NASM &=v5M9GR]
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). r?=3TAA
;Enter this into "hello.asm" then type: >W=^>8u
;"nasm -f elf hello.asm" 0|`iop%(n
;"ld hello.o -o hello" +(##B pC
;"./hello" qUG)+~g`
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section .data ;data section declaration DM*u;t{i
msg db 'Hello World!',0AH a |0f B4G
len equ $-msg ;string length |=s jGf
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section .text ;code section declaration 5OHF=wh
global _start ;entry point (start of execution) cAzlkh
_start: mov edx,len ;string length QPp>%iE@
mov ecx,msg ;string start m7,;Hr(
mov ebx,1 ;file handle: stdout C'fQ Z,r-v
mov eax,4 ;sys_write ZNY),3?
int 80h ;kernel system call J8PZVeWx
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mov ebx,0 ;return value Mt(;7q@1c
mov eax,1 ;sys_exit KvuM{UI5
int 80h ;kernel system call B7nm7[V
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x86 CPU,Windows,MASM32 ^%m~V LH
.386 jo[U6t+pj7
.model flat,stdcall D
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option casemap:none 8jfEvwY
;Include 文件定义 %jj\w>
include windows.inc H.[t&VO
include user32.inc /7yd&6`I
includelib user32.lib hO4* X
include kernel32.inc 7N[Cs$_]
includelib kernel32.lib u#v];6N
;数据段 .oxeo0@~
.data z#{%[X2
szCaption db 'A MessageBox!',0 TDHS/"MbA7
szText db 'Hello,world!',0 $ D(q
;代码段 4F?O5&329i
.code >7nOR
start: jMQ7^(9-
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK #%SF2PB;
invoke ExitProcess,NULL pDG>9P#mO
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> t[b@P<F
end start {DbWk>[DkG
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BEGIN { print "Hello, world!" } !jyy`q=
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BASIC )VFS&|#\
传统版BASIC(例如GWBASIC): ' |
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10 PRINT "Hello, world!" }i@%$Ixsn
20 END &cB+la\_
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或在提示符输入: K8|>" c~
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?"Hello, world!":END \-R\xL
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现代版BASIC(例如Quick BASIC): EMMp4KKOx+
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Print "Hello, world!" AWz|HF#-
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以下的语句在Quick BASIC中同样有效: JD{AwE@Ro
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? "Hello,world!"
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BCPL 2N}h<Yd9
GET "LIBHDR" +pJ~<ug]
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LET START () BE qq[Enf|/y
$( Ai.^~#%X
WRITES ("Hello, world!*N") R#Hz%/:|A
$) TWTh!
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Befunge XT~]pOE;D
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Brainfuck 3[}w#n1
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C T96M=?wh!
#include <stdio.h> P'D'+qS
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int main(void) -JfO} DRI
{ [eO6H2@=z
printf("Hello, world!\n"); XZ[3v9?&n
return 0; [Cf{2WB:7
} >19j_[n@VC
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C++ } {<L<
#include <iostream> uEcK0>xp
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int main() XI58Cy*!
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std::cout << "Hello, world!" << std::endl; b{hdEb
return 0; wQw
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} 6V6,m4e
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C++/CLI bd@1j`i
int main() A<<Bm M.%
{ 1n|K
System::Console::WriteLine("Hello, world!"); 8$y5) ~Q
} i $;y
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C# (C Sharp) =>,X)+O
class HelloWorldApp px=r~8M9}
{ %6HJM| {H
public static void Main() d2[R{eNX=
{ ZRLS3*`
System.Console.WriteLine("Hello, world!"); '?dT<w=Y&
} u[?M{E/HU
} AG(Gtvw
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COBOL lko
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IDENTIFICATION DIVISION. 4&+lc*
PROGRAM-ID. HELLO-WORLD. `/L D:R
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ENVIRONMENT DIVISION. a7wc>@9Q,
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DATA DIVISION. d0 qc%.s
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PROCEDURE DIVISION. YB3?Ftgw
DISPLAY "Hello, world!". _omz74
STOP RUN. JWo).
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Common Lisp 56T{ JTo
(format t "Hello world!~%") 8$C?j\J|*
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DOS批处理 -VO* P
@echo off 9 `z^'k&
echo "Hello, world!" }N%uQP#I
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Eiffel W@FRKDixG
class HELLO_WORLD tB==v{t
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creation diDB>W
make Cso-WG,
feature ~#y( ]Xec2
make is V4qv7
local h1jEulcMtq
io:BASIC_IO Z]x)d|3;
do '5
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!!io 't<hhjPqY
io.put_string("%N Hello, world!") -/3D0`R
end -- make p~NFiZ,
end -- class HELLO_WORLD S^*ME*DDz
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Erlang (7J (.EG2e
-module(hello). G*\U'w4w|*
-export([hello_world/0]). /j:fc?yv
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hello_world() -> io:fwrite("Hello, World!\n"). $KMxq=
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Forth 8xQjJ
." Hello, world!" CR q"|#KT^)
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Fortran X>kW)c4{b
WRITE(*,10) kb2M3%6V
10 FORMAT('Hello, World!') P[<EFjE
STOP &