“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 FOA
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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》。 Z)/6??/R
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以下是用不同语言写成的Hello World程序的几个例子: `8,w[o oC2
Ada PfyRZ[3)c
with Ada.Text_Io; use Ada.Text_Io; \ZS\i4
procedure Hello is w TlGJ$D0
begin 4RhR[
Put_Line ("Hello, world!"); Xq|nJ|h
end Hello; WM/#.
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汇编语言 h}avX*Lx_
#Rc5c+/(
x86 CPU,DOS,TASM eK9TAW
MODEL SMALL iSlFRv?a
IDEAL o
w2$o\hC
STACK 100H |=\91fP68`
R aefj(^V
DATASEG mG_BM/$
HW DB 'Hello, world!$' <{giHT
Rvvh{U;t
CODESEG s|Zx(.EP
MOV AX, @data }'lNi^"XL
MOV DS, AX Q!K`e )R
MOV DX, OFFSET HW [G a~%m
MOV AH, 09H B
s,as
INT 21H NgHpIonC
MOV AX, 4C00H +jtA&1cf
INT 21H " \:ced
END MD<-w|#8IV
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u =Y
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x86 CPU,GNU/Linux,NASM AliRpxxd
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). ~n6[$WjZA
;Enter this into "hello.asm" then type: FSU<Y1|XM
;"nasm -f elf hello.asm" a+41Ojv (
;"ld hello.o -o hello" .jU Z
;"./hello" "<*awWNI
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section .data ;data section declaration -l
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msg db 'Hello World!',0AH 0 O~p7D
len equ $-msg ;string length M/{g(|{
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section .text ;code section declaration _R7 w?!t8
global _start ;entry point (start of execution) t}Ss=0dJO
_start: mov edx,len ;string length :mpiAs<%U"
mov ecx,msg ;string start =OYQM<q
mov ebx,1 ;file handle: stdout W/r^ugDV
mov eax,4 ;sys_write I]X
int 80h ;kernel system call &!jq!u$(
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y{}10
mov ebx,0 ;return value !%xP}{(7
mov eax,1 ;sys_exit ' "'Btxz
int 80h ;kernel system call bD<qNqX$
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x86 CPU,Windows,MASM32 u g\w\b
.386 Kd3QqVJBz1
.model flat,stdcall :Q_x/+-
option casemap:none {B0h+. C
;Include 文件定义 JRO$<
include windows.inc pUCK-rL
include user32.inc (KTnJZ
includelib user32.lib KFDS q"j
include kernel32.inc |y"jZT6R}t
includelib kernel32.lib ?z/Vgk+9|
;数据段 `tE^jqrke5
.data e7xj_QH
szCaption db 'A MessageBox!',0 bU`=*
szText db 'Hello,world!',0 v7IzDz6gF
;代码段 )`8pd 7<.
.code F>+2DlA`<e
start: 6GYtY>
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK ([ dT!B#aH
invoke ExitProcess,NULL %6ub3PLw8
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> \ZD[!w7
end start `HW:^T
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AWK 1pP1d%
BEGIN { print "Hello, world!" } `.=sTp2rbc
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~ y;y(4<
BASIC jxw_*^w"
传统版BASIC(例如GWBASIC): R8&|+ya
:eOR-}p'
10 PRINT "Hello, world!" nrpI5t.b
20 END M3pjXc<O
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或在提示符输入: 4_LQ?U>$
:?CQuEv-
?"Hello, world!":END Y
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现代版BASIC(例如Quick BASIC): ~]WVG@-
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Print "Hello, world!" -2i\G .,J
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以下的语句在Quick BASIC中同样有效: _3>djF_u
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? "Hello,world!" `cr(wdvI
=Q(vni83<
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BCPL R Fko>d
GET "LIBHDR" ~rv})4h
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LET START () BE 0^~\COa
$( .Q>!B?)
WRITES ("Hello, world!*N") VC-;S7k
$) ^#e~g/
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:reTJQwr
Befunge Zb''mf\
"!dlrow olleH">v ]gEhE
, $-vo}k%M
^_@ . L;@=Yg)
'C?NJ~MN
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Brainfuck }$gmK
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< M>l^%`
+++++++++++++++.>.+++.------.--------.>+.>. R,Oe$J<
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C }
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#include <stdio.h> wW`}VKu
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int main(void) uDayBaR
{ oRq!=eUu_
printf("Hello, world!\n"); !/I0i8T
return 0; zAScRg$:?
} YaY8 `M{
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C++ $.K?N@(W
#include <iostream> Cg!^S(U4
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int main() c3xl9S,5
{ H+ZSPHs
std::cout << "Hello, world!" << std::endl; =_pwA:z"A
return 0; r;qzo.
} p!W[X%`)
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4]XI"-M^D
C++/CLI "x*-PFT
int main() Imym+
{ R+=a`0_S
System::Console::WriteLine("Hello, world!"); #y; yN7W
} &