“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。 Bb5|+bP
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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》。 $4^cbk
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以下是用不同语言写成的Hello World程序的几个例子: q6h'=By
Ada ~c&ygL3
with Ada.Text_Io; use Ada.Text_Io; P|>
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procedure Hello is Yv?nw-HM
begin sb Wn1 T
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Put_Line ("Hello, world!"); 9`P<|(
end Hello; Gkz\By
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汇编语言 yrp5\k*{y
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x86 CPU,DOS,TASM F)ak5
MODEL SMALL A>@ i
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IDEAL -nVQB146^
STACK 100H 6w3z&5DY|
M#BM`2!s
DATASEG P.L$qe>O
HW DB 'Hello, world!$' J1@X6U!{
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CODESEG pFfd6P
MOV AX, @data J9!}8uD
MOV DS, AX j_::#?o!/
MOV DX, OFFSET HW C`s
MOV AH, 09H ;B4x>
INT 21H $#3O:aW
MOV AX, 4C00H ,/?7sHK-0
INT 21H h<)YZ[;x
END nQe^Bn
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x86 CPU,GNU/Linux,NASM 7jss3^.wA
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). xLxXc!{J5
;Enter this into "hello.asm" then type: eI?|Ps{S
;"nasm -f elf hello.asm" ;DQ{6(
;"ld hello.o -o hello" $AGW8"
;"./hello" ( v<l9}!
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section .data ;data section declaration q"Ct=d
msg db 'Hello World!',0AH nitKX.t8
len equ $-msg ;string length !*[Fw1-J
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section .text ;code section declaration *P\$<4l
global _start ;entry point (start of execution) tM&O<6Y
_start: mov edx,len ;string length F8u;C:^d
mov ecx,msg ;string start 1k=w 9
mov ebx,1 ;file handle: stdout criQa<N"
mov eax,4 ;sys_write %2H0JXKa,
int 80h ;kernel system call $ z4JUr!m
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mov ebx,0 ;return value <OX_6d *@
mov eax,1 ;sys_exit ~.FeLWP
int 80h ;kernel system call K fM6(f:
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x86 CPU,Windows,MASM32 T;7=05k<_
.386 1!(Og~#(
.model flat,stdcall gLm ]*
option casemap:none r#8t@W
;Include 文件定义 1 u[a713O
include windows.inc 1L~y!il
include user32.inc %pikt7,Z~
includelib user32.lib (8JL/S;Z$
include kernel32.inc ;Jh=7wx
includelib kernel32.lib jXa;ovPK
;数据段 Z2Q'9C},m
.data Alo;kt@x
szCaption db 'A MessageBox!',0 `S`,H
szText db 'Hello,world!',0 $N
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;代码段 mP!=&u fcU
.code kGz0`8URu
start: @ Sq
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invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK prIPPeMdz
invoke ExitProcess,NULL
a ~
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> !?AgAsSmc
end start U?@ s`.
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AWK %-lilo
BEGIN { print "Hello, world!" } c0I;8z`b
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BASIC B//2R)HS
传统版BASIC(例如GWBASIC): 0|Rt[qwKb@
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10 PRINT "Hello, world!" 'P AIh*qA
20 END !6`pq
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或在提示符输入: 4Nb&(p
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?"Hello, world!":END
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现代版BASIC(例如Quick BASIC): jDO"?@+
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Print "Hello, world!" 4!vovt{
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以下的语句在Quick BASIC中同样有效: DB=^Z%%Z
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? "Hello,world!" +.czj,Sq
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BCPL 5WlBec@
GET "LIBHDR" h^B~Fv>~
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LET START () BE KUV(vAY,
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WRITES ("Hello, world!*N") 5bj9S
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Befunge cv=H6j]h|
"!dlrow olleH">v ?hFG+`"W
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C O0Pb"ou_h.
#include <stdio.h> 2ophh/]
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int main(void) P\rA>ZY
{ `Eg~;E:
printf("Hello, world!\n"); .T\jEH8E
return 0; ,hVDGif
} g7l?/p[n
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C++ d69synEw>k
#include <iostream> z+5%.^Re
N51e.;
int main() xf7_|l
{ /)J]m
std::cout << "Hello, world!" << std::endl; FoX,({*Ko~
return 0; )*`cJ_t
} fo"%4rkL
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C++/CLI +HSKFp
int main() (:|rCZC
{ X(npgkVP\
System::Console::WriteLine("Hello, world!"); n8.Tag(#
} K/l*Saj
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C# (C Sharp) 6k6}SlN[
class HelloWorldApp \%czNF
{ #zed8I:w
public static void Main() T1U8ZEK<iu
{ \sEH)$R'
System.Console.WriteLine("Hello, world!"); }8Yu"P${Y
} V6!1(|
} PLueH/gC .
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COBOL ^|lw~F
IDENTIFICATION DIVISION. O!k C
PROGRAM-ID. HELLO-WORLD. 2u%YRrp
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ENVIRONMENT DIVISION. iOdk)
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DATA DIVISION. O"ebrv
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PROCEDURE DIVISION. V'8Rz#Gc5
DISPLAY "Hello, world!". 7m.>2U
STOP RUN. 3{{Ew}kZm
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Common Lisp mIW/x/I
(format t "Hello world!~%") 9CFh'>}$
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DOS批处理 XR+
@echo off {lbNYjknS
echo "Hello, world!" l&_PsnU
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Eiffel ly::?
class HELLO_WORLD 6=p!`DOd
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creation ^D?{[LBc
make 62 9g_P)
feature -J;;6aA
make is =Bos>;dl
local 7{Zs"d{s
io:BASIC_IO TlCGP)VSj
do 5BS !6o;P'
!!io rAZ~R PrW
io.put_string("%N Hello, world!") 4G'-"u^g
end -- make z#GrwE,r
end -- class HELLO_WORLD j_0xE;g"]
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Erlang Lt_A&
-module(hello). (g3DI*Z
-export([hello_world/0]). Ns$,.D
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hello_world() -> io:fwrite("Hello, World!\n"). !,O Y{='
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zsr; 37
Forth >9,LN;Ic
." Hello, world!" CR ,0aRHy_^
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w3FEX$`_
Fortran R,`3 SW()
WRITE(*,10) ltlnXjRUv
10 FORMAT('Hello, World!') OWZ;X}x
STOP .RpWE.C
END w"q^8"j!
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HTML &F.L*M
<HTML> oA+'9/UY
<HEAD> ut^6UdJ+`
<TITLE> Hello World! </TITLE> 6E$ET5p&