“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。 {R`,iWV
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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》。 !Db0r/_:G
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以下是用不同语言写成的Hello World程序的几个例子: _FV<[x,nE8
Ada )`Zj:^bz9
with Ada.Text_Io; use Ada.Text_Io; 9wR-0E
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procedure Hello is vkFfHzR$
begin Ww(($e!
Put_Line ("Hello, world!"); <>!Y[Xr^
end Hello; 8&q|*/2
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汇编语言 j2oHwt6"
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x86 CPU,DOS,TASM M]\p9p(_
MODEL SMALL >FrF"u:kM
IDEAL +f#oij
STACK 100H jlhyn0
>MXE)=
DATASEG h>s|MZQ:*
HW DB 'Hello, world!$' Qi&!Ub]
z^tws*u],5
CODESEG z5~{WAAI
MOV AX, @data < 0S+[7S"
MOV DS, AX #;4afj:2g
MOV DX, OFFSET HW Z0fl]3p
MOV AH, 09H K|"97{*|2
INT 21H gY)NPi}!`
MOV AX, 4C00H qU ESN!
INT 21H f-Yp`lnn.d
END Oy U[(
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x86 CPU,GNU/Linux,NASM )s @}|`
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). k91ctEp9>
;Enter this into "hello.asm" then type: t:pgw[UJ
;"nasm -f elf hello.asm" os=Pr{
;"ld hello.o -o hello" -,;r %7T
;"./hello" >Ln/ )j
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section .data ;data section declaration [^iQE
msg db 'Hello World!',0AH >U.)?>G/dt
len equ $-msg ;string length E=Z;T
P!;%DI!<b
section .text ;code section declaration qu}`;\9@ld
global _start ;entry point (start of execution) ROWb:tX}
_start: mov edx,len ;string length + -[M 7J
mov ecx,msg ;string start $UgQ1Qc
mov ebx,1 ;file handle: stdout 2(_+PQ6C=
mov eax,4 ;sys_write RR*eq.;
int 80h ;kernel system call @-uV6X8|
)3W`>7>
mov ebx,0 ;return value BvXA9YQ3
mov eax,1 ;sys_exit D1Yc_
int 80h ;kernel system call C26vH#C
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}sbh|#
x86 CPU,Windows,MASM32 V$D+Joj
.386 mM6g-)cV
.model flat,stdcall =Gka;,n
option casemap:none -pWnO9q
;Include 文件定义 ccLTA
include windows.inc O$'BJKj-4
include user32.inc dNQR<v\IL
includelib user32.lib (k{rn3,
include kernel32.inc ~Y-
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includelib kernel32.lib sTn}:A6
;数据段 v()
wngn
.data z_)`='&n
szCaption db 'A MessageBox!',0 AFd3_>h
szText db 'Hello,world!',0 Ch3{q/-g
;代码段 jgcI|?yL
.code \v7->Sy8
start: QkEIV<T&)l
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK F XpI-?#E<
invoke ExitProcess,NULL ]n8
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;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> r8o9C
end start -vRZCIj!
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AWK RW4}n<
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BEGIN { print "Hello, world!" } '<Nhq_u{
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BASIC n^H Kf^]
传统版BASIC(例如GWBASIC): 9-Y.8:A`
`k ^d)9
10 PRINT "Hello, world!" Q]Kc<[E
20 END DEdJH4
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或在提示符输入: wt8?@lJ"/
Y[(U~l,a+
?"Hello, world!":END [Pn(d[$z
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现代版BASIC(例如Quick BASIC): C}i1)
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Print "Hello, world!" v;S_7#
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以下的语句在Quick BASIC中同样有效: 0j=xWC
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? "Hello,world!" q_5hKipd\b
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BCPL mes/gqrJ1I
GET "LIBHDR" ,KT[ }P7
PWch9p0U
LET START () BE EWI2qaSnO
$( my.%zF
WRITES ("Hello, world!*N") `R9}.?7
$) q+KGQ*
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<BUKTRq
Befunge ;9WS#>o
"!dlrow olleH">v 1
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, E<
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B) 5QI
Brainfuck !>n^ ;u
++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<< i!|OFU6
+++++++++++++++.>.+++.------.--------.>+.>. E46+B2_~zk
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C DlD;rL=
#include <stdio.h> !CnkG<5z>
1FkS$ j8:
int main(void) i4Ps#R_wx
{ &bIE"ZBjt
printf("Hello, world!\n"); lk<}`#( g
return 0; K!L0|WH%!
} _LYI#D
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C++ :1O49g3R
#include <iostream> t08E
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u3[A~V|0=
int main() <WWn1k_
{ [EdX6
std::cout << "Hello, world!" << std::endl; +*'^T)sj/
return 0; Vr|sRvz
} li4"|T&
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+dw=)A#/
C++/CLI L}*s_'_e^>
int main() Cyn_UE
{ @ 4ccZ&`
System::Console::WriteLine("Hello, world!"); _?aI/D
} u{Rgk:bn
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C# (C Sharp) KKFV+bK)
class HelloWorldApp :iKk"r,2P[
{ eeOE\
public static void Main() 0@BhRf5
{ ::&hfHR*P
System.Console.WriteLine("Hello, world!"); lD K<gd
} n'i~1pM,?
} 1kX>sajp~
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COBOL !_a@autj
IDENTIFICATION DIVISION. RTXl3
jq
PROGRAM-ID. HELLO-WORLD. `S&.gPE2
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ENVIRONMENT DIVISION. [f8mh88r
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DATA DIVISION. UHaY|I${U
20NotCM
PROCEDURE DIVISION. K:<0!C!
DISPLAY "Hello, world!". :m{;<LRV
STOP RUN. Bh%Yu*.f
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Common Lisp %]KOxaf_z
(format t "Hello world!~%") gf]k@-)
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DOS批处理 f,s1k[w/;
@echo off }zE
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echo "Hello, world!" S0zk<