“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。 69w"$Vk
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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》。 L*Cf&c`8r
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以下是用不同语言写成的Hello World程序的几个例子: Z-V%lRQ=b
Ada gx.]4v
with Ada.Text_Io; use Ada.Text_Io; "C|l3X'
procedure Hello is ml/O
begin J<O_N~$$*
Put_Line ("Hello, world!"); DN_C7\CoA
end Hello; SuuS!U+i>
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汇编语言 K?I&,t_*R
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x86 CPU,DOS,TASM -L3RzX
MODEL SMALL ^@> Qiy
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STACK 100H X Y?@^
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DATASEG @=1``z#
HW DB 'Hello, world!$' !Z)^c&
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CODESEG eF\C?4
MOV AX, @data J4X35H=Z
MOV DS, AX jzw?V9Ijb
MOV DX, OFFSET HW \mGM#E
MOV AH, 09H Ji=iq=S7
INT 21H r $2
MOV AX, 4C00H AXI:h"so
INT 21H J8'zvH&I
END MPc=cLv
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x86 CPU,GNU/Linux,NASM znRhQ+8;!
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). g>CQO,s;w
;Enter this into "hello.asm" then type: a"4 6_>
;"nasm -f elf hello.asm" {P+[CO
;"ld hello.o -o hello" c^k.
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;"./hello" -qF| Y
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section .data ;data section declaration 1=.?KAXR
msg db 'Hello World!',0AH b>EUa> h
len equ $-msg ;string length *5)!y
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section .text ;code section declaration _\[G7
global _start ;entry point (start of execution) ,oil}N(
_start: mov edx,len ;string length /L^dHI]Q
mov ecx,msg ;string start 2N]s}/l
mov ebx,1 ;file handle: stdout 8m0sEV>
mov eax,4 ;sys_write >S]')O$c
int 80h ;kernel system call V|`|CVFo]
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mov ebx,0 ;return value VV0$L=mo
mov eax,1 ;sys_exit >AJ|F)
int 80h ;kernel system call [l:.Q?? )|
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x86 CPU,Windows,MASM32 $Plk4 o*g
.386 Tkf !Y?
.model flat,stdcall yL-L2
option casemap:none D$;/
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;Include 文件定义 89bKnsV
include windows.inc }fZBP]<I(
include user32.inc nt6"}vO
includelib user32.lib @d|9(,Q
include kernel32.inc m6D4J=59
includelib kernel32.lib x
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;数据段 sn%fE
.data o5uwa{v
szCaption db 'A MessageBox!',0 KMcP !N.I
szText db 'Hello,world!',0 TH &B9
;代码段 g~b'}^J
.code 6npwu5!
start: a$m?if=
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK {{\HU0g>&
invoke ExitProcess,NULL Z%R^;8 !~
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end start ,d#4Ib
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BEGIN { print "Hello, world!" } KMZ`Wn=
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BASIC [qB=OxH?
传统版BASIC(例如GWBASIC): @$]h[
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10 PRINT "Hello, world!" M;R>]wP"V
20 END Tx_LH"8
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或在提示符输入: &3V4~L1aEg
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?"Hello, world!":END XJ9>a-{
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现代版BASIC(例如Quick BASIC): 6%-2G@6d
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Print "Hello, world!" 65v'/m!ys
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以下的语句在Quick BASIC中同样有效: yr?\YKV)I
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? "Hello,world!" 4~4Hst#^
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BCPL mwxJ#
GET "LIBHDR" 5|Qr"c$p
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LET START () BE c1[;a>
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WRITES ("Hello, world!*N") Ad `IgZ
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Befunge Zh@\+1]
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C L<:ya
#include <stdio.h> dx^3(#B
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int main(void) 4?Io@[7A)
{ (&S v$L@
printf("Hello, world!\n"); I ;_.tG
return 0; X^ovP'c2
} VaB7)r
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C++ z,)Fvs4U.
#include <iostream> &("?6%GC
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int main() T*oH tpFj#
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std::cout << "Hello, world!" << std::endl; ,#crtX
return 0; *jYwcW"R{z
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C++/CLI [f'7/w+
int main() =Zj9F1E[i
{ @:Ns`+ W*
System::Console::WriteLine("Hello, world!"); Th8xh=F[
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C# (C Sharp) _u>+H#
class HelloWorldApp 8)i\d`
{ :!%oQQO
public static void Main() X**wRF
{ V#=N?p
System.Console.WriteLine("Hello, world!"); \R~Lf+q
} dgO2fI
} >@t]M`#&h
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COBOL sIyLW
IDENTIFICATION DIVISION. U}UIbJD*=
PROGRAM-ID. HELLO-WORLD. ? f%@8%px
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ENVIRONMENT DIVISION. eN/Jb;W
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DATA DIVISION. LcF0: h'
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PROCEDURE DIVISION. @FQ@*XD
DISPLAY "Hello, world!". ;>PV]0bOm>
STOP RUN. -/h$Yb
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Common Lisp @gZ%>qe
(format t "Hello world!~%") Y$(G)Fs
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DOS批处理 }\1V;T
@echo off 4-m}W;igu
echo "Hello, world!" ddw!FH2W
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Eiffel Ar|_UV>Zf
class HELLO_WORLD Wjj'yqBO^
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creation *QrTZ$\C
make Ngg (<ZN
feature a+]@$8+
make is hRME;/r]X
local }@x0@sI9
io:BASIC_IO f1Rm9``
do nF7Ozxm#
!!io ^f4qs
io.put_string("%N Hello, world!") ]+J]}C]\d
end -- make 5Eq_L
end -- class HELLO_WORLD \wTWhr0
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Erlang GLEGyT?~
-module(hello). {~Phc 2z
-export([hello_world/0]). %R}}1
Rrs z{a
hello_world() -> io:fwrite("Hello, World!\n"). v=|ahsYC
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Forth T,k`WR
." Hello, world!" CR (;!&RZ
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Fortran H=B8'N
WRITE(*,10) :[,n`0lH
10 FORMAT('Hello, World!') :c
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STOP KpSHf9!&[
END Y@Ty_j~
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N'TL &]
HTML ^ng?+X>mP
<HTML> Zsaz#z|xW
<HEAD> g&v2=&aj
<TITLE> Hello World! </TITLE> Zpg$:Rr
</HEAD> =T!M`
<BODY> S?;&vs9j
<p>Hello World!</p> E{h
</BODY> e;,D!
</HTML> {D$#m
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DO ,1 SUB #1 <- #238 0z.Hl1
DO ,1 SUB #2 <- #112 Xn4U!<RT"
DO ,1 SUB #3 <- #112 }VdohX-
DO ,1 SUB #4 <- #0 OSxr@
DO ,1 SUB #5 <- #64 C}#JvNyQ
DO ,1 SUB #6 <- #238 @"];\E$sI
DO ,1 SUB #7 <- #26 vTN$SgzfCU
DO ,1 SUB #8 <- #248 YS%HZFY, "
DO ,1 SUB #9 <- #168 _r&`[@m
DO ,1 SUB #10 <- #24 m%l\EE
DO ,1 SUB #11 <- #16 ,{7Z OzA
DO ,1 SUB #12 <- #158 B_nim[72
DO ,1 SUB #13 <- #52 | M4_@P
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Java Fd9ypZs
public class Hello <