“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。 yL1bS|@
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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》。 z1V#'$_5-
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以下是用不同语言写成的Hello World程序的几个例子: 6oL1_)
Ada Mi7y&~,
with Ada.Text_Io; use Ada.Text_Io; "ZMkL)'7-
procedure Hello is ]MTbW=*}ED
begin q/&y*)&'O
Put_Line ("Hello, world!"); 8im@4A+n`
end Hello; /VTM 9)u
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汇编语言 \h{r;#g
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x86 CPU,DOS,TASM e [0w5)X
MODEL SMALL Ff4*IOZ}(
IDEAL j
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STACK 100H
>'=MH2;
%{5n1w
DATASEG <,1fkq>,
HW DB 'Hello, world!$' C;rG]t^%
!u;>Wyd W
CODESEG i+vsp@d
MOV AX, @data )j&"%[2F
MOV DS, AX F
# YPOH
MOV DX, OFFSET HW 'cd N3i(
MOV AH, 09H Iw=Sq8
INT 21H }nx=e#[g%2
MOV AX, 4C00H I$q>
INT 21H *OTS'W~t
END S"2qJ!.u
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x86 CPU,GNU/Linux,NASM &jQ?v@|1c
;"Hello World" for Linux on Intel 80x86 using nasm (Intel syntax). rR{,)fX;
;Enter this into "hello.asm" then type: pBJAaCGm
;"nasm -f elf hello.asm" GH4iuPh]
;"ld hello.o -o hello" 5z/Er".P
;"./hello" )mN9(Ob!
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section .data ;data section declaration sq0 PBEqq
msg db 'Hello World!',0AH <G3&z#]#4
len equ $-msg ;string length /!xF?OmVd
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section .text ;code section declaration dE=Ue#1U@5
global _start ;entry point (start of execution) U8QX46Br
_start: mov edx,len ;string length V6a``i]
mov ecx,msg ;string start Q5+_u/
mov ebx,1 ;file handle: stdout <,%:
mov eax,4 ;sys_write X]*QUV]i
int 80h ;kernel system call |;vi*u
Sfjje4R
mov ebx,0 ;return value H=MCjh&$q
mov eax,1 ;sys_exit =_TaA(79
int 80h ;kernel system call OEgI_=B
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m~l
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x86 CPU,Windows,MASM32 ,TC;{ $O5
.386 e;95a
.model flat,stdcall xK%=
option casemap:none 9uB(Mx(-:`
;Include 文件定义
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include windows.inc 7,$z;Lr0S
include user32.inc 2&(sa0*y
includelib user32.lib ?/#}ZZK^
include kernel32.inc quu*xJ;Ci
includelib kernel32.lib \+PIe7f_
;数据段 3/6/G}s
.data ZU2laqa_
szCaption db 'A MessageBox!',0 y }2F9=
szText db 'Hello,world!',0 -e@!
;代码段 $ChK]v
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.code }-<zWI{p
start: >`T5]_a
invoke MessageBox,NULL,offset szText,offset szCaption,MB_OK ]> !<G8=N
invoke ExitProcess,NULL h1"zV6U
;>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> J{"kw1Lu
end start C'mL&
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AWK N+W&NlZ
BEGIN { print "Hello, world!" } &Vk; VM`5
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BASIC ;&;W
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传统版BASIC(例如GWBASIC): Ze^jG-SL$9
q }C+tn"\
10 PRINT "Hello, world!" GR4?BuY,
20 END ~[PKcEX
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或在提示符输入: B7*}c]^6/
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?"Hello, world!":END d.<~&.-$
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现代版BASIC(例如Quick BASIC): Bstk{&ew
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Print "Hello, world!" J]/}ojW3
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以下的语句在Quick BASIC中同样有效: S5=Udd"
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? "Hello,world!" xBnbF[
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BCPL %i{;r35M;9
GET "LIBHDR" Yn51U6_S
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LET START () BE "E!mva*NU
$( P1zK2sL_
WRITES ("Hello, world!*N") QGnxQ{ko
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Befunge g<*jlM1r
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Brainfuck rx~[Zs+*
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C NY
#include <stdio.h> FpV`#6i7
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int main(void) c$E)P$<j
{ V-O(U*]
printf("Hello, world!\n"); H6kf
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return 0; P1kB>"bR
} 0`#(Toe{B
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C++ "`tXA
#include <iostream> 0Dv JZ|e
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int main() ~XM[>M\qB
{ 8}p8r|d!ls
std::cout << "Hello, world!" << std::endl; <EX7WA
return 0; |(IO=V4P
} 0OZ Mlt%z
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C++/CLI (-yl|NFBw
int main() [W,|kDK
{ GUp;AoQ
System::Console::WriteLine("Hello, world!"); HZJL/=;
} =C7
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C# (C Sharp) Qc-(*}
class HelloWorldApp ;6;H*Y0,|E
{ +=@ ^i'
public static void Main() '"YYj$>
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{ R'K/t|MC
System.Console.WriteLine("Hello, world!"); eBr4O i
} Ggm` ~fS
} -$8.3\6h
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COBOL ?r_kyuU
IDENTIFICATION DIVISION. fZryG
PROGRAM-ID. HELLO-WORLD. :J_oj:0r"f
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ENVIRONMENT DIVISION. 5>0.NiXGf'
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DATA DIVISION. j+ ::y) $
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PROCEDURE DIVISION. n2-0.Er
DISPLAY "Hello, world!". cgZaPw2
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STOP RUN. D@54QJ<
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Common Lisp $^% N U
(format t "Hello world!~%") 0%C^8%(x
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DOS批处理 4cgIEw[6
@echo off 85Y|CN] vQ
echo "Hello, world!" X)Gp7k1w
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Eiffel .(Y6$[#@
class HELLO_WORLD XX; 6 P
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creation mf$j03tu
make ]KK`5Dv|,e
feature I."p
make is 4SVW/Zl.?
local Di(9]:+
io:BASIC_IO :b#%C
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do __N.#c/l{
!!io SG]K
io.put_string("%N Hello, world!") WStnzVe
end -- make T 1Cs>#)
end -- class HELLO_WORLD M}FWBs'*|
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Erlang A|RR]CFJ
-module(hello). W'/>et
-export([hello_world/0]). %v=!'?VT
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hello_world() -> io:fwrite("Hello, World!\n"). o0Gx%99'
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Forth rxE&fjW
." Hello, world!" CR ^#SBpLw
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Fortran f1cl';
WRITE(*,10) hPO>,j^
10 FORMAT('Hello, World!') Q<