“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。 8[H bg
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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》。 jbe_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: [D"5@
Ada uhU'm@JZ
with Ada.Text_Io; use Ada.Text_Io; /5X_gjOL,
procedure Hello is #wZbG|%
begin 0|6Y%a\U
Put_Line ("Hello, world!"); aZ8f>t1Q
end Hello; O4cBn{Dq9
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汇编语言 b$sT`+4q
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x86 CPU,DOS,TASM i3cMRcS;
MODEL SMALL Ln8r~[tVE<
IDEAL ]sI\.a
STACK 100H \c1>15
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DATASEG 9
^=kt 2[
HW DB 'Hello, world!$' 8Oa+,?<0x
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CODESEG .I]EP-
MOV AX, @data %<|cWYM="z
MOV DS, AX s_3a#I
MOV DX, OFFSET HW 7NkMr8[}F
MOV AH, 09H LbuhKL}VN
INT 21H KB{IWu
MOV AX, 4C00H
Wf~PP;
INT 21H :<v@xOzxx
END YIF|8b\
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x86 CPU,GNU/Linux,NASM ^iWJqpLe
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). ?:6w6GwAA
;Enter this into "hello.asm" then type: Bkg./iP5x
;"nasm -f elf hello.asm" -b)3+#f
;"ld hello.o -o hello" +R_s(2vz
;"./hello" _zkTx7H
*xN?5u%
section .data ;data section declaration +F~B"a
msg db 'Hello World!',0AH :kC*<f\
len equ $-msg ;string length r::0\{{r"p
[OS&eK 8
section .text ;code section declaration T%A"E,#
global _start ;entry point (start of execution) ==S^IBG
_start: mov edx,len ;string length 8gG;A8
mov ecx,msg ;string start |xT'+~u
mov ebx,1 ;file handle: stdout ?7"v~d]>
mov eax,4 ;sys_write w,j;XPp
int 80h ;kernel system call ,hZ?]P&
mnx`e>0
mov ebx,0 ;return value ;M"[dy`dY
mov eax,1 ;sys_exit rH'|$~a
int 80h ;kernel system call B>[myx
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x86 CPU,Windows,MASM32 ANfy+@
.386 iu$Y0.H@
.model flat,stdcall _YN
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option casemap:none g9Ty%|Q7(
;Include 文件定义 GcG$>&,
include windows.inc xEv?2n@A
include user32.inc `NNP}O2
includelib user32.lib =}0$|@pl
include kernel32.inc
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includelib kernel32.lib 7eW6$$ju,N
;数据段 g1 =>u
.data Qjd]BX;
szCaption db 'A MessageBox!',0 Zy|u5J
szText db 'Hello,world!',0 f ~bgZ
;代码段 P0RtS1A
.code >Bu_NoM
start: )@<HG$#
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK |{RCvm
invoke ExitProcess,NULL 9v1 Snr
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> {;Oj
end start E,fbIyX
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AWK +:W? :\
BEGIN { print "Hello, world!" } t>x!CNb'C
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BASIC o6:@j#b
传统版BASIC(例如GWBASIC): wr~Qy4 ny
[Fv_~F491
10 PRINT "Hello, world!" deJ/3\t
20 END I:0dz:T7*
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或在提示符输入: [ua[A;K
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?"Hello, world!":END u$X =2u:P
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现代版BASIC(例如Quick BASIC): YN~1.!F
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Print "Hello, world!" 1^ iLs
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以下的语句在Quick BASIC中同样有效: O-box?
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? "Hello,world!" DiZ;FHnaG?
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BCPL $e.Bz`
GET "LIBHDR" 0_,un^
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LET START () BE L">m2/ HG
$( c._!dqR
WRITES ("Hello, world!*N") j,Qb'|f5
$) d,Oe3?][0p
v- p8~u1N
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Befunge Y![8-L|Q
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Brainfuck /||8j.Tm
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+++++++++++++++.>.+++.------.--------.>+.>. 8#9OSupp
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C ]\]mwvLT
#include <stdio.h> ymT]ow6C
prB:E[1
int main(void) 8#4Gs Q"
{ um\A
printf("Hello, world!\n"); #a'CoJs
return 0; v&7x ~!O
} _d+` Gw
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C++ CK_\K,xVT
#include <iostream> V343IT\
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int main() XhN?E-WywQ
{ AgB$
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std::cout << "Hello, world!" << std::endl; <y"lL>JR
return 0; R;uP^
} Q8]S6,pt
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C++/CLI '*t<g@2$
int main() 23opaX5V=
{ @V@<j)3P
System::Console::WriteLine("Hello, world!"); 6;Mv)|FJF
} 3E>]6
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C# (C Sharp) ! \5)!B
class HelloWorldApp 'b+
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{ `8TL*.9
public static void Main() V;P*/ke
{ Eh[NKgYL
System.Console.WriteLine("Hello, world!"); u/wWD@,
} Jq+@%#G
} @[n%q.|VB
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COBOL %;J$ h^
IDENTIFICATION DIVISION. N]GF>kf:
PROGRAM-ID. HELLO-WORLD. cCIs~*D
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ENVIRONMENT DIVISION. 5j _[z|W2
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DATA DIVISION. U;gy4rj
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PROCEDURE DIVISION. pwF])uf*{\
DISPLAY "Hello, world!". Hq,NOP
STOP RUN. nQn=zbZ3
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Common Lisp wB<