“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。 (7"qT^s3
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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》。 v<O\ l~S
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以下是用不同语言写成的Hello World程序的几个例子: WTXTr0=
Ada y
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with Ada.Text_Io; use Ada.Text_Io; d;f,vN(
procedure Hello is /(Y\ <
begin Bk8U\Ut
Put_Line ("Hello, world!"); *H;&hq
end Hello; >$}nKPC,Y
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汇编语言 ;$Wa=wHb
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x86 CPU,DOS,TASM p@P[pzxI
MODEL SMALL 9[:nWp^
IDEAL /wmJMX
STACK 100H G G7N!eZ
J9/w_,,R$
DATASEG f}*Xz.[bCp
HW DB 'Hello, world!$' iud%X51
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CODESEG %e_WO,R
MOV AX, @data -cG?lEh<
MOV DS, AX B3K%V|;z
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MOV DX, OFFSET HW ]SK (cfA`
MOV AH, 09H e{"d6pF=
INT 21H lk8VJ~2d
MOV AX, 4C00H 7%JXVP}A
INT 21H W0R6<-
1
END Y~Zg^x2
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B} &C
h
x86 CPU,GNU/Linux,NASM h$lY,7
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). E]Kd`&^}
;Enter this into "hello.asm" then type: 7m8L!t9
;"nasm -f elf hello.asm" d8|:)7PSt
;"ld hello.o -o hello" Xa-]+_?Q
;"./hello" )U8F6GIC&}
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section .data ;data section declaration k/Cr ^J"
msg db 'Hello World!',0AH 2 !{P<
len equ $-msg ;string length y#r=^r]l)
qD2<-E&M/
section .text ;code section declaration K?P.1H`
global _start ;entry point (start of execution) %R(j|a9z
_start: mov edx,len ;string length |
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mov ecx,msg ;string start |i1z47jN6P
mov ebx,1 ;file handle: stdout UUX
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mov eax,4 ;sys_write hd+JKh!u
int 80h ;kernel system call F/mD05{
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mov ebx,0 ;return value d@`yRueWiV
mov eax,1 ;sys_exit #~(@Ka.eA0
int 80h ;kernel system call IDv@r\Xw
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x86 CPU,Windows,MASM32 K{HdqmxL.I
.386 bvZmozbD
.model flat,stdcall }Dk_gom_
option casemap:none n1$p
esr
;Include 文件定义 2_U H, n
include windows.inc ?jy^WF`
include user32.inc gm4-w 9M[p
includelib user32.lib :s*&_y
include kernel32.inc 3"%:S_[
includelib kernel32.lib 60-LpGhvy
;数据段
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.data _)lK.5
szCaption db 'A MessageBox!',0 DAJh9I
szText db 'Hello,world!',0 owQLAV
;代码段 2Ask]
.code -0lpsF
start: <PXA`]x~
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK g`\Vy4w
invoke ExitProcess,NULL NeUpl./b
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> %$Mvq&ZZ
end start >[ywrB ?T
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BEGIN { print "Hello, world!" } <[b\V+M
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BASIC h1J-AfV
传统版BASIC(例如GWBASIC): .3oFSc`q
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10 PRINT "Hello, world!" &9IMZAo
20 END ePB=aCZ
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或在提示符输入: >(*jL
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?"Hello, world!":END (Z
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现代版BASIC(例如Quick BASIC): 0G;RMR ':5
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Print "Hello, world!" ^h=;]vxO
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以下的语句在Quick BASIC中同样有效: Kq{9:G
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? "Hello,world!" [BmondOx
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BCPL a!4'}gHR
GET "LIBHDR" SC"=M^E
qDOx5.d
LET START () BE oQFpIX;\m
$( >e"1a/2%>&
WRITES ("Hello, world!*N") n(-XI&Kn
$) z$H
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Befunge CQ6Z[hLWF
"!dlrow olleH">v k2p{<SO;
, GXJJOy1"!
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#include <stdio.h> &nTB^MF
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int main(void) /k(0}g=\
{ :1=mNrg
printf("Hello, world!\n"); .,<-lMC+
return 0; ;g7nG{
} [u=b[(
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C++ !2$O^
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#include <iostream> { ~FYiX
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int main() \KDOI 7
{ Z#nj[r!l}
std::cout << "Hello, world!" << std::endl; jW"C: {Ol;
return 0; NA !;#!
} D 0\
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C++/CLI pX*Oc6.0mu
int main() kce+aiv|u
{ ,d@.@a]
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System::Console::WriteLine("Hello, world!"); >/eQjp?:
} VctAQ|h^
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C# (C Sharp) -D`*$rp,
class HelloWorldApp TBvv(_
{ 4Ts5*_
public static void Main() sGc4^Z%l?
{ n\ZDI+X
System.Console.WriteLine("Hello, world!"); 9=K=gfZ
} #p6#,PZ
} 5<Xq7|Jt
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COBOL IH'DCY:
IDENTIFICATION DIVISION. >jq~5HN
PROGRAM-ID. HELLO-WORLD. $@7S+'Q3
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ENVIRONMENT DIVISION. M~zdcVTbH
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DATA DIVISION. K.dgQ-vn
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PROCEDURE DIVISION. pEw &i
DISPLAY "Hello, world!". `$fwLC3j
STOP RUN. <