“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。 _u$K Lqt/,
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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》。 Y>~JI;Cu`
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以下是用不同语言写成的Hello World程序的几个例子: P{18crC[1
Ada DF2&j!
with Ada.Text_Io; use Ada.Text_Io; Ysu/7o4
procedure Hello is 5ov%(QI
begin *q{UipZbx
Put_Line ("Hello, world!"); $Stu-l1e a
end Hello; =Qrz|$_rv
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汇编语言 ub5hX{uT
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x86 CPU,DOS,TASM hT"K}d;X
MODEL SMALL W<"\hQI
IDEAL *\", qMp
STACK 100H 3G^Ed)JvE
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DATASEG dL(|Y{4
HW DB 'Hello, world!$' R:N-y."La.
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CODESEG [[Z>(d$8
MOV AX, @data TzGm562o%
MOV DS, AX |m- `,
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MOV DX, OFFSET HW g/p
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MOV AH, 09H VWt'Kx"
INT 21H (+dRD]|T
MOV AX, 4C00H vq1&8=
INT 21H G`"Cqs<
END <>_WdAOuD
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x86 CPU,GNU/Linux,NASM ~b0qrjF;O
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). WmUW
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;Enter this into "hello.asm" then type: A#&qoZ(C
;"nasm -f elf hello.asm" (p=GR#
;"ld hello.o -o hello" R"`{E,yj
;"./hello" :'~ gLW>j
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section .data ;data section declaration om?CFl
msg db 'Hello World!',0AH ~-wJ#E3g
len equ $-msg ;string length X:&p9_O@
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section .text ;code section declaration 7"p s#)O
global _start ;entry point (start of execution) ]xEE7H]\h
_start: mov edx,len ;string length RI3{>|*
mov ecx,msg ;string start ;bX
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mov ebx,1 ;file handle: stdout shIi,!bZ
mov eax,4 ;sys_write P1 stL,
int 80h ;kernel system call F
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mov ebx,0 ;return value )Cvzj<Q0
mov eax,1 ;sys_exit X@U1Ri
int 80h ;kernel system call % T \N@
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x86 CPU,Windows,MASM32 B@inH]wq
.386 wS*CcIwj
.model flat,stdcall cu!bg+,zl
option casemap:none O'|P|
;Include 文件定义 Ks2%F&\cE
include windows.inc UMQW#$~C{g
include user32.inc 3}{5
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includelib user32.lib 5'Jh2r
include kernel32.inc N('DIi*or
includelib kernel32.lib T,2Dr;
;数据段 2%C5P0;QX
.data DN':-PK
szCaption db 'A MessageBox!',0 OKP_3Ns
szText db 'Hello,world!',0 ESjJHZoD(
;代码段 g{)H"
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.code nvo1+W(%
start: w })Pedg
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK xWz;5=7a]
invoke ExitProcess,NULL }lUpC}aq_
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> XqS*;Zj0
end start 0$Y 9>)O
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BEGIN { print "Hello, world!" } vq:OH
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BASIC [2 w<F[
传统版BASIC(例如GWBASIC): ]q[
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10 PRINT "Hello, world!" w+q;dc8
20 END agm5D/H]:
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或在提示符输入: a05:iFoJ
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?"Hello, world!":END xT?} wF
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现代版BASIC(例如Quick BASIC): ,x"yZ
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Print "Hello, world!" ->2wrOH|H
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以下的语句在Quick BASIC中同样有效: vs])%l%t
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? "Hello,world!" dFP-(dX#
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BCPL ]RXtC*
GET "LIBHDR" ,C,e/>+My
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LET START () BE kH8$nk eev
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WRITES ("Hello, world!*N") 4 ^~zN"6]
$) -8Jl4F ,
*- IlF]
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Befunge +.(}u ,:8
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C <% 7P
#include <stdio.h> }y-;>i#m=g
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int main(void) j`|^s}8t
{ o~o6S=4,}
printf("Hello, world!\n"); cbu nq"
return 0; NM1cyZ
} *0&4mi8
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C++ or%gTVZ
#include <iostream> >1a\%G
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int main() tFvgvx\:
{ }}``~
std::cout << "Hello, world!" << std::endl; I`"-$99|t1
return 0; 3KZ
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} z>mZT.
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C++/CLI ~.W=
int main() Wd^lt7(j
{ OC?Zw@
System::Console::WriteLine("Hello, world!"); FYXw$7'l
} T\2) $
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C# (C Sharp) j(Fa=pi
class HelloWorldApp L_Y9+
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{ OAW=Pozr9
public static void Main() jiwpDB&